CN105223604B - Low Background Gamma Spectroscopy Device - Google Patents

Abstract

The invention discloses a low background gamma energy spectrum analysis device, which comprises: the device comprises a detector and a shielding device, wherein the shielding device comprises a liquid container, the liquid container is suitable for containing liquid, and an analyte is suitable for being immersed in the liquid container so as to be detected by the detector after the liquid shields gamma rays in the environment around the analyte. According to the low background gamma energy spectrum analysis device, the analyte and the detector are immersed in the liquid with a good gamma ray shielding effect, and the gamma rays in the environment are shielded by the liquid, so that the background level can be reduced when the gamma rays of the analyte are measured, the sensitivity of the measurement method is improved, and the gamma energy spectrum analysis with low activity level is realized.

Description

Low Background Gamma Spectroscopy Device

technical field

The invention relates to the technical fields of radiation environment monitoring and nuclear emergency monitoring, in particular to a low-background gamma energy spectrum analysis device.

Background technique

To carry out gamma spectroscopy analysis at lower activity levels, both the detector and the analyte need to be placed in a gamma ray shielding device to reduce the influence of ambient gamma rays and improve the detection limit. The shielding device in the related art usually adopts lead room shielding body. The thickness of the standard lead room shielding body used for laboratory gamma energy spectrum analysis is 10cm, and the thickness of the lead room shielding body used for gamma energy spectrum analysis in vehicle-mounted mobile laboratories is generally is 5cm. In environmental monitoring or emergency monitoring, the large lead room is used in the vehicle-mounted mobile laboratory, and the space, load and transportation costs are too high. Effects of gamma rays, KX rays of Pb and radon progeny in shielded body cavities. In actual work, technicians go to the monitoring site to collect samples, and then send them to the central laboratory for gamma spectroscopy analysis. This way of working cannot guarantee timeliness for emergency monitoring.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a low-background gamma energy spectrum analysis device, which is small in weight, easy to carry, and can meet the requirements of emergency state or field monitoring.

The low-background gamma energy spectrum analysis device according to the present invention includes: a detector; and a shielding device, wherein the shielding device includes a liquid-containing container, the liquid-containing container is suitable for containing liquid, and the analyte is suitable for immersion in the The liquid in the liquid container is detected by the detector after shielding the gamma rays in the surrounding environment of the analyte by the liquid.

According to the low-background gamma energy spectroscopic analysis device of the present invention, by immersing the analyte in a liquid with a good gamma ray shielding effect, the gamma ray in the environment is shielded by the liquid, so that the gamma ray in the environment can be shielded. It can reduce the background level and improve the sensitivity of the measurement method, and realize the gamma energy spectrum analysis of low activity level.

Further, the liquid container is a soft container, and the shielding device further includes a detachable support frame, the support frame surrounds and is supported on the periphery of the liquid container.

According to some embodiments of the present invention, the support frame includes: a frame body and a height-adjustable base, the base is mounted on the bottom of the frame body for adjusting the level of the bottom surface of the bracket body.

Further, the height of the frame body is adjustable.

According to some embodiments of the present invention, the low-background gamma spectroscopy analysis device further comprises: a fixing device for fixing the detector and the analyte together; and a lifting device , the lifting device is used to control the depth position of the fixing device immersed in the liquid and replace the analyte.

According to some embodiments of the present invention, the top of the liquid container is open, and the lifting device includes: a mounting bracket, the mounting bracket includes a vertical rod and a horizontal rod fixed on the upper part of the vertical rod, the horizontal rod At least part of the rod is located above the liquid container; a pulley assembly is provided on the mounting frame and includes a first pulley mounted on the vertical rod and a pulley mounted on the horizontal rod a second pulley; and a suspension wire, one end of the suspension wire is wound around the first pulley, and the other end of the suspension wire is passed around the second pulley to hang the fixing device.

Further, the lifting device further includes a guide wheel, the guide wheel is installed at the intersection of the horizontal rod and the vertical rod, and the suspension wire bypasses the guide wheel and then bypasses the second pulley .

According to some embodiments of the present invention, the fixing device includes: a protective frame, in which the detector is fixed; and a sample box for containing the analyte, the sample box is fixed on the The front end in the protection frame and located in the vertical direction of the detector.

Further, the bottom of the protection frame is provided with a horizontal plate.

According to some embodiments of the present invention, the fixing device further comprises: a locking device provided on the protective frame for locking the sample box on the fixing device.

According to some embodiments of the present invention, the fixing device further comprises: a waterproof cover, and the fixing device and the sample box cover are provided in the waterproof cover.

According to some embodiments of the present invention, a liquid discharge port is formed on the liquid container.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

1 is a schematic diagram of a low-background gamma energy spectrum analysis device according to an embodiment of the present invention;

Fig. 2 is the schematic diagram of the first cross bar shown in Fig. 1;

Figure 3 is a schematic view of the second crossbar shown in Figure 1;

Fig. 4 is the schematic diagram of the first vertical rod shown in Fig. 1;

Fig. 5 is the schematic diagram of the second vertical rod shown in Fig. 1;

Figure 6 is a schematic view of the third vertical rod assembly shown in Figure 1;

Fig. 7 is the schematic diagram of the third vertical rod shown in Fig. 6;

Figure 8 is a schematic diagram of the fourth connector shown in Figure 6;

Fig. 9 is the schematic diagram of the first connector shown in Fig. 1;

Figure 10 is a schematic diagram of the second connector shown in Figure 1;

Figure 11 is a schematic diagram of the third connector shown in Figure 1;

Figure 12 is a schematic diagram of the fifth connector shown in Figure 1;

Figure 13 is a schematic view of the base shown in Figure 1;

Figure 14 is a schematic view of the auxiliary lever shown in Figure 1;

Figure 15 is a schematic view of the mounting disk shown in Figure 14;

Fig. 16 is the schematic diagram of the limit wire tray shown in Fig. 1;

Figure 17 is a schematic view of the spool shaft shown in Figure 1;

Figure 18 is a schematic view of the inner sleeve shown in Figure 1;

Figure 19 is a schematic view of the vertical rod shown in Figure 1;

Figure 20 is a schematic view of the inclined rod shown in Figure 1;

Figure 21 is a schematic view of the horizontal rod shown in Figure 1;

FIG. 22 is a schematic diagram of the first connection portion shown in FIG. 21;

Fig. 23 is a schematic diagram of the second connection portion shown in Fig. 21;

Figure 24 is a schematic view of the pulley shaft shown in Figure 1;

Figure 25 is a schematic view of the second pulley shown in Figure 1;

Figure 26 is a schematic view of the bearing housing shown in Figure 1;

Figure 27 is a schematic view of the bushing shown in Figure 1;

FIG. 28 is a schematic view of the bearing gland shown in FIG. 1 .

Reference number:

Low background gamma energy spectrum analysis device 100,

Detector 10, drain 21,

The supporting frame 30, the base 31, the first horizontal bar 32, the second horizontal bar 33, the first vertical bar 34, the second vertical bar 35, the third vertical bar assembly 36, the third vertical bar 36a,

The first connector 41, the second connector 42, the third connector 43, the fourth connector 44, the fifth connector 45,

Mounting frame 50, horizontal rod 51, first connecting part 511, second connecting part 512, vertical rod 52, inner sleeve 521, inclined rod 53, auxiliary rod 54, mounting plate 541,

Limiting spool 61, spool shaft 611, second pulley 62, pulley shaft 621, guide wheel 63, hanging wire 64,

Bearing seat 71, shaft sleeve 72, bearing gland 73,

Protective frame 81 , fixing hole 82 , horizontal plate 83 .

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

The following disclosure provides many different embodiments or examples for implementing different structures of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials.

The low-background gamma energy spectrum analysis apparatus 100 according to an embodiment of the present invention is described below with reference to FIGS. 1 to 28 .

As shown in FIG. 1 , a low-background gamma energy spectrum analysis device 100 according to an embodiment of the present invention includes a detector 10 and a shielding device.

Specifically, the detector 10 is used to detect the gamma rays emitted by the analyte to measure the radionuclide activity or specific activity of the analyte. For example, the detector 10 can be a high-purity germanium gamma spectrometer. or sodium iodide gamma spectrometer.

The shielding device includes a liquid container, the liquid container is suitable for containing liquid, and the analyte is suitable for immersion in the liquid in the liquid container, so that the liquid shields the gamma rays in the surrounding environment of the analyte and detects it through the detector 10 . That is to say, the liquid contained in the liquid container is a gamma ray shielding body (for example, the liquid can be tap water or water that is not contaminated by radioactivity, or it can be a chemical liquid that is non-corrosive, non-toxic, harmless, and non-radioactive contamination). ), when the analyte is detected, the analyte is immersed in the liquid, and the liquid can shield the gamma rays in the environment, thereby reducing the gamma rays in the environment detected by the detector and reducing the gamma rays in the environment. The influence of radiation on detection reduces the gamma ray background of the analyte to be measured, thereby realizing gamma spectroscopy at low activity levels.

It should be noted that when the analyte is exposed to air for measurement, gamma rays from surface rocks, soil, surrounding buildings and radionuclides in the air, as well as the soft component of cosmic rays, will affect the detection. The detection accuracy and detection limit of the analyte in the device 10; when the analyte is placed in the liquid, after the gamma rays and cosmic rays in the environment pass through the liquid of a certain thickness, most of the rays are absorbed by the liquid, which can reduce the The background value measured by the detector 10 realizes low-background gamma energy spectrum analysis.

For example, when the liquid is water, the thickness of the water shield reaches 1 m, and the probe of the detector 10 is submerged 25 cm below the water surface, the natural radioactive background of the low-background gamma spectroscopy analysis device 100 can usually be reduced to less than 10% (shielding effect of standard lead room shielding body), so as to achieve low background gamma energy spectrum analysis.

According to the low-background gamma energy spectrometry apparatus 100 according to the embodiment of the present invention, by immersing the analyte in a liquid with a good gamma ray shielding effect, the gamma rays in the environment can be shielded by the liquid, so that the gamma rays in the environment can be shielded by the liquid. When measuring the analyte gamma ray, the background level is reduced, the sensitivity of the measurement method is improved, and the gamma energy spectrum analysis of low activity level is realized.

In one embodiment of the present invention, the liquid container may be a soft container, which is light in weight, easy to fold and pack, and convenient to carry, and can store a large amount of liquid, so that low-background gamma can be quickly constructed in the field The energy spectrum analysis device 100 meets the needs of emergency detection in the field.

Preferably, the material of the liquid container can be selected from materials with good strength, ductility and low level of radioactivity. For example, the liquid container can be made of polyvinyl chloride coated cloth, which is waterproof, resistant to resistance. Inflammability, cold resistance, aging resistance, anti-corrosion performance, and low level of radioactivity, can be used repeatedly, which can improve the service life of the liquid container. When the liquid container needs to be used, it only needs to be set on the periphery of the liquid container. The supporting frame 30 that can support the liquid container is sufficient. Of course, the present invention is not limited to this, and the liquid container can also be an inflatable container. In this way, the liquid container can have a certain rigidity through inflation, thereby simplifying the support frame 30 or eliminating the need for the support frame 30 .

Referring to FIG. 1 , the shielding device further includes a detachable support frame 30 , that is, the support frame 30 can be assembled and disassembled, thereby making it easy to carry and improving the applicability of the shielding device for field detection. The support frame 30 can surround and be supported on the periphery of the liquid container, thereby preventing the liquid container from being deformed by the pressure of the liquid after the liquid is injected, thereby improving the overall rigidity of the shielding device.

For example, in the example shown in FIG. 1 , the liquid container is made of polyvinyl chloride-coated cloth, and is formed as a cylindrical container with a regular hexagonal cross section, and the support frame 30 is formed as a cylindrical frame with a regular hexagonal bottom surface. , the support frame 30 includes vertical rods, horizontal rods and connecting heads, wherein the vertical rods and the horizontal rods are connected through the connecting heads and fastened with screws, so as to facilitate the on-site assembly and disassembly of the support frame 30 . The top of the liquid container is designed with a sleeve that can be used to pass through the cross bar, so that the support frame 30 can support the liquid container. Preferably, the horizontal rods and vertical rods of the support frame 30 are made of aluminum alloy tubes with lighter texture, and the connecting joints can be made of stainless steel.

Of course, the shape of the liquid container is not limited to this, the liquid container can also be formed as a container with a circular cross section, a regular polygon or other shapes; of course, the shape of the support frame 30 is not limited to this, as long as the support frame 30 functions The effect of stably supporting the liquid container is sufficient. It should be noted that the specific size parameters of the support frame 30 need to be determined according to the parameters of the liquid container.

Further, the support frame 30 may include: a frame body and a height-adjustable base 31, the base 31 is installed at the bottom of the frame body to adjust the level of the bottom surface of the support body, that is, by changing the height of the base 31, Adjust the horizontal state of the bottom surface of the frame body, and then adjust the horizontal state of the bottom surface of the liquid container. For example, the upper part of the base 31 can be formed with an external thread, and the vertical rod connected with the base 31 can be formed with the external thread of the base 31. Due to the uneven ground in the field environment, the height of the base 31 can be adjusted by adjusting the connecting thread between the base 31 and the vertical rod, so that the bottom surface of the liquid container is in a horizontal state. Of course, the connection between the base 31 and the vertical rod is not limited to this, and the base 31 and the vertical rod can also be connected by a bayonet to adjust the height of the base 31 .

Furthermore, the height of the frame body is adjustable to improve the applicability of the support frame 30 . Preferably, the vertical rods of the frame body can include vertical rods of different lengths, so that the supporting frames 30 of different heights can be assembled by using vertical rods of different lengths. For example, the vertical rods forming the frame body can include vertical rods with a length of 1 m A rod (such as the first vertical rod 34) and a vertical rod with a length of 0.5m (such as the second vertical rod 35), when only the first vertical rod 34 with a length of 1 m is used to assemble, the total height of the support frame 30 is 1 m. When the first vertical rod 34 of 1 m and the second vertical rod 35 of 0.5 m are used for butt assembly, the total height of the support frame 30 is 1.5 m. Of course, the present invention is not limited to this, and different vertical rods can also be connected by connectors, and the connector can adjust the connection length between the vertical rods to adjust the height of the frame body, for example, it can be connected by a sleeve-type thread , or select snap connections at different positions along the vertical direction to adjust the length of the connection between the vertical bars.

According to some embodiments of the present invention, referring to FIG. 1 , the low-background gamma energy spectrometry apparatus 100 may further include: a fixing device and a lifting device, and the fixing device is used for fixing the detector 10 and the analyte together, so as to facilitate The detector 10 detects the analyte and has the effect of protecting the detector 10. The lifting device is used to control the depth position of the fixing device immersed in the liquid and replace the analyte. That is, the detector 10 can be adjusted by the lifting device. and the depth of the analyte in the liquid to achieve different shielding effects. In addition, when replacing the analyte, it is necessary to use a lifting device to lift the fixing device out of the liquid surface to facilitate the replacement of the analyte.

According to some embodiments of the present invention, the top of the liquid container is open to facilitate submersion of the analyte into the liquid from the top of the liquid. 1, the lifting device may include: a mounting frame 50, a pulley assembly and a suspension wire 64, wherein the mounting frame 50 includes a vertical rod 52 and a horizontal rod 51 fixed on the upper part of the vertical rod 52, and at least part of the horizontal rod 51 is located in the container Above the liquid container, the pulley assembly is installed on the mounting frame 50 and includes a first pulley installed on the vertical rod 52 and a second pulley 62 installed on the horizontal rod 51. One end of the suspension wire 64 is wound around the first pulley. , the other end of the suspending wire 64 bypasses the second pulley 62 and then hangs the fixing device. Optionally, the suspending wire 64 is a nylon rope.

Further, the first pulley is a limitable wire reel 61, whereby one end of the suspension wire 64 can be fixed on the limit wire reel 61 to adjust the height of the other end of the suspension wire 64 through the limit wire reel 61, that is, to adjust the detector 10 the height of. Preferably, an auxiliary rod 54 can be added to the outer side of the support frame 30, and both ends of the auxiliary rod 54 can be fixed on the same vertical rod of the vertical rod of the support frame 30 that is connected with the mounting bracket 50, and the limit wire plate 61 can be installed on On the auxiliary rod 54, the stability of the installation of the limit wire disc 61 can be improved. Optionally, the position of the limit wire disk 61 can be fixed by pins, so as to achieve the purpose of lifting and fixing the position of the detector 10 .

The lifting device further includes a guide wheel 63, the guide wheel 63 is installed at the intersection of the horizontal rod 51 and the vertical rod 52, and the suspension wire 64 bypasses the guide wheel 63 and then the second pulley 62, so that the suspension wire 64 can be more stressed. Uniform, the structure of the lifting device is more reasonable.

As shown in FIG. 1 , the mounting frame 50 includes a horizontal rod 51 , a vertical rod 52 and an inclined rod 53 , the left end of the horizontal rod 51 is fixed on the upper part of the vertical rod 52 , and the inclined rod 53 is connected to the horizontal rod 51 and the vertical rod 52 In order to increase the rigidity of the mounting frame 50 to ensure that the mounting frame 50 does not deform significantly after suspending the detector 10 and the analyte, the right end of the horizontal rod 51 is located above the liquid container, and the limit wire plate 61 is installed on the vertical At the lower end of the straight rod 52, the guide wheel 63 is installed at the connection between the horizontal rod 51 and the vertical rod 52, the second pulley 62 is installed on the right end of the horizontal rod 51, one end of the hanging wire 64 is wound around the limit wire plate 61, and the other One end bypasses the guide wheel 63 and then the second pulley 62, and is connected to the fixing device, so as to suspend the detector 10 and the analyte on the mounting frame 50, and the other end of the suspension wire 64 can be changed by adjusting the limit wire plate 61 Extending the length of the second pulley 62 places the detector 10 in place in the liquid.

Preferably, during the detection process of the detector 10, the axis of the probe of the detector 10 is coincident with the central axis of the shielding liquid, so that a better shielding effect can be obtained.

According to an embodiment of the present invention, the mounting bracket 50 can be fixed on the support frame 30, for example, the lower end of the vertical rod 52 of the mounting bracket 50 can be connected to the upper end of one of the vertical rods of the supporting frame 30 through a connector, and the connector A bearing can be sleeved inside, whereby the mounting frame 50 can rotate around the axis of the bearing, so as to facilitate the suspension of the detector 10 and the replacement of the analyte. Of course, the present invention is not limited to this, and the mounting frame 50 can also be fixed on the cross bar of the support frame 30 through a plurality of connecting joints with bearings sleeved therein.

According to some embodiments of the present invention, referring to FIG. 1 , the fixing device includes: a protection frame 81 and a sample box for containing the analyte, the detector 10 is fixed in the protection frame 81 , and the protection frame 81 can reduce the accidental fall of the fixing device In order to avoid damage to the probe of the detector 10, the sample box is fixed in the protective frame 81 and is located at the front end of the detector 10 in the vertical direction, that is to say, the detector 10 and the sample box are both fixed in the protective frame 81, And the detector 10 and the sample box are arranged in the up-down direction. Here, the "front end" refers to the end where the probe of the detector 10 is located. For example, in the example shown in FIG. 1 , the protective frame 81 is formed into two rectangular integrated frames, the upper one is larger and the lower is smaller, the detector 10 is fixed in the upper large frame of the protection frame 81 , and the probe position is downward, and it is placed to be analyzed. The sample box of the object is fixed in the lower small frame of the protective frame 81 .

Further, referring to FIG. 1 , the bottom of the protective frame 81 may be provided with a horizontal plate 83 , so that the sample box can be installed on the horizontal plate 83 , and the horizontal plate 83 is also convenient for the fixing device to be placed upright, increasing the convenience of use. Preferably, the top of the protection frame 81 may be provided with a fixing hole 82 , and the suspension wire 64 may pass through the fixing hole 82 to suspend the protection frame 81 on the mounting frame 50 .

According to some embodiments of the present invention, the fixing device may further include: a locking device, the locking device is provided on the protection frame 81 for locking the sample box on the fixing device, thereby improving the reliability of the installation of the sample box , and after adjusting the sample box at a suitable height position, use the locking device to lock the sample box, so as to effectively adjust the distance between the sample box and the detector 10, so that the sample box is close to the probe of the detector 10, and the detection accuracy is improved. precision.

According to an embodiment of the present invention, the fixing device may further include: a waterproof cover, and the fixing device and the sample box cover are arranged in the waterproof cover, thereby preventing liquid from infiltrating the detector 10 and ensuring the sensitivity of the detector 10; in addition, the waterproof cover It also has the effect of protecting the detector 10 .

In some embodiments of the present invention, a liquid discharge port 21 may be formed on the liquid container. After the detection by the detector 10 is completed, the liquid in the liquid container can be discharged through the liquid discharge port 21. Preferably, the liquid discharge port 21 can be set on the bottom side of the liquid container, and a standard fire hydrant connector can be installed on the liquid discharge port 21, so that after the detection is completed, an external drain pipe can be connected to the fire hydrant connector to discharge the liquid into the hydrant. in sewers or gutters.

According to an embodiment of the present invention, the liquid can be tap water or well water or uncontaminated surface water for residents to drink, the water medium is easy to obtain, and the cost is low, which can not only reduce the detection of the low-background gamma energy spectrum analysis device 100 It can also meet the needs of emergency detection in the field.

The low background gamma energy spectrum analysis device 100 according to a specific embodiment of the present invention will be described below with reference to FIGS. 1-28 .

Referring to FIG. 1 , the low-background gamma energy spectrum analysis device 100 includes a detector 10 , a shielding device, a lifting device and a fixing device, wherein the detector 10 is installed on the fixing device.

Specifically, the detector 10 may be a high-purity germanium gamma spectrometer or a sodium iodide gamma spectrometer.

The shielding device includes a liquid container and a support frame 30, wherein the support frame 30 is used to support the liquid container, and the liquid container can contain liquid, and the height of the liquid can be increased to a suitable height according to the requirements of the shielding effect. To be readily available in the work area, and non-corrosive, harmless, non-radioactive contamination substances, such as aqueous media.

Specifically, the liquid container is a cylindrical container with a regular hexagonal bottom, and the top is open. The height of the liquid container is 1.5m, and the side length is 1.15m, that is, the shortest distance from the center to each side is 1m. There is a liquid discharge port 21 on the bottom side of the liquid discharge port 21, and a fire hydrant connector is installed on the liquid discharge port 21. The liquid container is made of polyvinyl chloride coated cloth. The top of the liquid container is designed with a sleeve that can be used to pass through the cross bar. The cylinder is used to facilitate the support frame 30 to support the liquid container.

The support frame 30 is formed as a cylindrical frame structure with a hexagonal cross section, and the support frame 30 includes a base 31, a cross bar, a vertical bar and a connector. Specifically, the base 31 is six, and the cross bar includes twenty-two lengths. The first crossbar 32 with a length of 1.15m and two second crossbars 33 with a length of 1.13m, the vertical rods include six first vertical rods 34 with a length of 1m, five second vertical rods 35 and a third vertical rod The length of the rod 36a, the second vertical rod 35 and the third vertical rod 36a are all 0.5m, the third vertical rod 36a is a steel pipe, the first horizontal rod 32, the second horizontal rod 33, the first vertical rod 34 and the second vertical rod 35 are all aluminum tubes, and the connecting heads include sixteen first connecting heads 41, five second connecting heads 42, one third connecting head 43, one fourth connecting head 44 and one fifth connecting head 45. The connecting heads, The horizontal bar and the vertical bar are fastened with screws.

In the process of assembling the support frame 30, it can be assembled into five groups of first vertical rod assemblies and one group of second vertical rod assemblies connected with the lifting device. When assembling the first vertical rod assembly, the first vertical rod 34 and the second vertical rod assembly The rods 35 are connected by a second connecting head 42 . The upper end of the second vertical rod 35 , the middle part of the first vertical rod 34 and the lower end of the first vertical rod 34 are all equipped with a first connecting head 41 , and the base 31 is connected to the first vertical rod 34 . bottom of. When assembling the second vertical rod assembly, the first vertical rod 34 is connected to the third vertical rod assembly 36 through the third connecting head 43, and the third vertical rod assembly 36 includes the third vertical rod 36a and the third vertical rod 36a welded to the third vertical rod 36a. The fourth connecting head 44 at the upper end, the fifth connecting head 45 is installed in the middle of the first vertical rod 34 , the first connecting head 41 is installed on the lower part of the first vertical rod 34 , and the base 31 is connected to the lower end of the first vertical rod 34 . The first crossbar 32 and the second crossbar 33 are connected between the vertical rod assemblies. The crossbars are divided into four layers, that is, a layer of crossbars is installed every 0.5m, wherein the uppermost row of the vertical rod assemblies passes through the crossbars. Sleeve above the liquid container to support the liquid container.

The fixing device includes a protective frame 81, a sample box, a locking device and a waterproof cover, wherein the sample box contains the analyte, the protective frame 81 is formed into two rectangular frame structures, the upper one is larger and the lower is smaller, and the detector 10 is installed on the protection frame. In the upper large frame of 81, the probe of the detector 10 extends to the lower small frame of the protection frame 81. The upper part of the protection frame 81 is provided with a fixing hole 82, and the lower part is provided with a horizontal plate 83. The sample box can be installed on the horizontal plate 83, and the lock The locking device is arranged at the lower part of the small frame of the protective frame 81 to lock the sample box, and the height of the locking device is adjustable. After the detector 10 and the sample box are both fixed in the protective frame 81, the waterproof cover can be covered in Protect the frame 81 to prevent water from entering the detector 10 during the detection process.

The lifting device includes a mounting frame 50, a pulley assembly and a suspension wire 64, wherein the mounting frame 50 includes a horizontal rod 51, a vertical rod 52, an oblique rod 53 and an auxiliary rod 54, and the vertical rod 52 is installed on the upper end of the second vertical rod assembly, The left end of the horizontal rod 51 is connected to the upper end of the vertical rod 52, the left end of the horizontal rod 51 is provided with a first connecting part 511, the right end is provided with a second connecting part 512, and the inclined rod 53 is connected to the horizontal rod 51 and the vertical rod by screws. Between 52, the auxiliary rod 54 is installed on the outer side of the second vertical rod assembly of the support frame 30, and the auxiliary rod 54 is welded with a mounting plate 541.

The pulley assembly includes a first pulley, a second pulley 62 and a guide pulley 63. The first pulley is a limit wire reel 61. The limit wire reel 61 is installed on the mounting plate 541 of the auxiliary rod 54 through the wire reel shaft 611. The wire reel shaft 611 can be a pin, the guide wheel 63 is installed on the first connecting part 511 at the left end of the horizontal rod 51, the second pulley 62 is installed on the second connecting part 512 at the right end of the horizontal rod through the pulley shaft 621, and the second pulley 62 is connected with the The wire groove of the guide wheel 63 is located in the same vertical plane; one end of the wire is fixed on the limit wire disc 61, and the other end bypasses the guide wheel 63 and the second pulley 62, and passes through the fixing hole of the protective frame 81 82, and sleeved on the fixing hole 82 of the protective frame 81 to suspend the detector 10 and the sample box.

Preferably, the vertical rod 52 is mounted to the second vertical rod assembly through a bearing assembly, specifically, an inner sleeve 521 can be sleeved in the vertical rod 52, and the vertical rod 52 and the inner sleeve 521 are connected to the fourth through the bearing assembly The head 44 is connected with the third vertical rod 36a, and the bearing assembly includes a bearing seat 71, a bushing 72 and a bearing press cover 73, whereby the vertical rod 52 can rotate around the axis of the bearing assembly, preferably, the vertical rod 52, Both the horizontal rod 51 and the auxiliary rod 54 are made of steel pipes.

When the analyte needs to be detected, put the analyte into the sample box, fix the sample box on the horizontal plate 83 of the protective frame 81, adjust the distance between the sample box and the probe through the locking device, after the adjustment is completed , put on the waterproof cover, rotate the vertical rod 52 to make the axis of the probe coincide with the central axis of the water, and then adjust the limit line disk 61 so that the lower end surface of the probe of the detector 10 is located 25cm below the water surface. The analyte is detected.

Of course, the position of the probe of the detector 10 is not limited to this, and the position of the detector 10 and the sample box in the water body can be changed by the lifting device to achieve different shielding effects. Of course, by selecting liquid containers with different heights and diameters and changing the volume of water, that is, different shielding thicknesses, different shielding effects can also be achieved.

According to the low-background gamma spectroscopy analysis device 100 of the present invention, since the water medium is easy to obtain, it can adapt to field conditions, quickly build an analysis laboratory, and quickly measure and analyze the radioactive analyte at a low activity level. The rapid and accurate requirements of emergency state or field monitoring, at the same time, the whole set of equipment is easy to carry, transport and build, providing a rapid response measurement platform for emergency monitoring or field analysis.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Axial, Radial, Circumferential The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, with a specific orientation. The orientation configuration and operation are therefore not to be construed as limitations of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, The scope of the invention is defined by the claims and their equivalents.

Claims (9)

1. a low-background gamma energy spectrum analysis device, is characterized in that, comprises: detectors; and A shielding device, the shielding device includes a liquid-containing container, the liquid-containing container is suitable for containing a liquid, and the analyte is suitable for immersion in the liquid in the liquid-containing container, so as to shield the to-be-to-be-contained by the liquid Gamma rays in the environment surrounding the analyte are then detected by the detector, The liquid container is a soft container, and the shielding device further comprises a detachable support frame, the support frame surrounds and is supported on the periphery of the liquid container, The support frame includes a vertical rod, a horizontal rod and a connecting head, and the vertical rod and the horizontal rod are connected by the connecting head, The support frame includes: a frame body and a height-adjustable base, the base is installed at the bottom of the frame body for adjusting the level of the bottom surface of the frame body, and the height of the frame body is adjustable. 2. The low-background gamma energy spectrum analysis device according to claim 1, further comprising: a fixture for securing the detector and the analyte together; and A lifting device, the lifting device is used to control the depth position of the immobilization device immersed in the liquid and to replace the analyte. 3. The low-background gamma energy spectrum analysis device according to claim 2, wherein the top of the liquid container is open, and the lifting device comprises: an installation frame, the installation frame includes a vertical rod and a horizontal rod fixed on the upper part of the vertical rod, and at least part of the horizontal rod is located above the liquid container; a pulley assembly provided on the mounting frame and comprising a first pulley mounted on the vertical rod and a second pulley mounted on the horizontal rod; and A suspension wire, one end of the suspension wire is wound around the first pulley, and the other end of the suspension wire goes around the second pulley and then hangs the fixing device. 4 . The low-background gamma energy spectrum analysis device according to claim 3 , wherein the lifting device further comprises a guide wheel, and the guide wheel is installed at the intersection of the horizontal rod and the vertical rod. 5 . where the suspension wire goes around the guide wheel and then goes around the second pulley. 5. The low-background gamma energy spectrum analysis device according to claim 2, wherein the fixing device comprises: a protective frame within which the detector is secured; and A sample box for containing the analyte, the sample box is fixed in the protective frame and is located at the front end of the detector in the vertical direction. 6 . The low-background gamma energy spectrum analysis device according to claim 5 , wherein a horizontal plate is provided at the bottom of the protective frame. 7 . 7. The low-background gamma energy spectrum analysis device according to claim 5, wherein the fixing device further comprises: A locking device is provided on the protective frame for locking the sample box on the fixing device. 8. The low-background gamma energy spectrum analysis device according to claim 5, wherein the fixing device further comprises: A waterproof cover, the fixing device and the sample box cover are arranged in the waterproof cover. 9 . The low-background gamma energy spectrum analysis device according to claim 1 , wherein a liquid discharge port is formed on the liquid container. 10 .

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