CN117870500A - Gamma ray irradiation test distance measuring device and distance measuring method - Google Patents

Abstract

The invention provides a gamma ray irradiation test distance measuring device and a distance measuring method, which are used for solving the technical problems of measuring errors, reading errors and the like of the existing distance measuring method, wherein the distance measuring device comprises a fixed ring and a distance measuring unit; the fixed ring is sleeved outside the source protection cover of the radiation source and comprises two arc sections which are connected with each other, and the outer cambered surfaces of the arc sections are respectively provided with a sliding rail; the ranging unit comprises a range finder and a mounting bracket, and the mounting bracket comprises a supporting frame and an arc-shaped mounting piece; one end of the support frame is vertically arranged on the outer cambered surface of the arc-shaped mounting piece along the radial direction, and the inner cambered surface of the arc-shaped mounting piece is in sliding connection with the sliding rail of the arc section; the support frame is provided with a mounting groove for installing the range finder, and the measuring end of the range finder is far away from the radiation source, and the range finder is used for determining the placement position of a sample to be measured. In addition, the invention also provides a ranging method based on the ranging device.

Description

Gamma ray irradiation test distance measuring device and distance measuring method

Technical Field

The invention relates to a distance measuring device, in particular to a distance measuring device and a distance measuring method for a gamma ray irradiation test.

Background technique

The gamma-ray irradiation test is an irradiation test conducted on semiconductor electronic components to determine whether they can withstand the total ionizing dose of gamma rays. Since gamma rays cannot be directly observed and will cause serious damage to semiconductor electronic components, semiconductor electronic components used in radiation environments such as the aerospace field must undergo irradiation tests to examine their ability to withstand the total dose in the radiation environment.

In the irradiation test, there is an extremely important parameter, namely the dose rate. The commonly used radiation source is the cobalt 60 radiation source. The determination of its dose rate is closely related to the distance from the sample to be tested to the radiation source. Therefore, the measurement of the distance is very important for the determination of the dose rate.

In the prior art, the commonly used distance measurement method is to use a tape measure or a ruler to measure directly, which has the following disadvantages:

(1) Since the distribution of the radiation source dose rate within a certain longitudinal height range is a cylindrical surface with the radiation source as the central axis, when using a tape measure or ruler for measurement, if the measurement path does not coincide with the diameter of the radiation source cylinder, it is easy to cause errors in the measured distance.

(2) When the surveyor reads the scale of the ruler, if his eyes are not facing the ruler directly, it will cause reading errors.

(3) When using a ruler or tape measure, one end of the ruler or tape measure must be placed against the radiation source shield and the other end against the sample surface. Therefore, one end of the ruler or tape measure cannot be placed directly against the sample surface and can only be roughly estimated, resulting in measurement errors.

Summary of the invention

The purpose of the present invention is to provide a gamma ray irradiation test distance measuring device and a distance measuring method, which are used to solve the technical problems of measurement error and reading error in the existing distance measuring method.

In order to achieve the above object, the technical solution of the present invention is as follows:

A gamma ray irradiation test distance measuring device is used to measure the distance between the sample to be tested and the radiation source. Its special features are:

It includes a fixing ring and a distance measuring unit;

The fixing ring is sleeved on the outside of the radiation source shield, and comprises two circular arc segments connected to each other, and the outer arc surfaces of the circular arc segments are respectively provided with sliding rails;

The distance measuring unit comprises a distance meter and a mounting bracket, and the mounting bracket comprises a support frame and an arc-shaped mounting piece;

One end of the support frame is vertically mounted on the outer arc surface of the arc-shaped mounting member along the radial direction, and the inner arc surface of the arc-shaped mounting member is slidably connected to the slide rail of the circular arc section; the support frame is provided with a mounting groove, and a rangefinder is installed in the mounting groove, and the measuring end of the rangefinder is away from the radiation source and faces the sample to be measured, and the rangefinder is used to determine the placement position of the sample to be measured.

Furthermore, a plurality of grooves are evenly distributed on the inner arc surface of the arc-shaped mounting piece, and a magnet is installed in each groove. Under the action of the magnet, the inner arc surface of the arc-shaped mounting piece is magnetically attracted to the slide rail of the circular arc segment.

Furthermore, one end of the two arc segments is hinged to each other, and the outer side of the other end is provided with a connecting lug, and the connecting lug is provided with a connecting hole, and the other ends of the two arc segments are fixedly connected by screws passing through the connecting holes.

At the same time, the present invention also provides a γ-ray irradiation test distance measurement method, which adopts the above-mentioned γ-ray irradiation test distance measurement device, and its special feature is that it includes the following steps:

Step 1: Install the fixing ring on the source shield of the radiation source;

Step 2: pre-set the length measurement reference of the rangefinder according to the distance requirement between the sample to be measured and the radiation source, and then install the rangefinder on the support frame of the mounting bracket so that the measuring end of the rangefinder is away from the radiation source and toward the sample to be measured;

Step 3, install the arc-shaped mounting part of the mounting bracket on the slide rail of the arc section so that the optical path of the rangefinder output light is parallel to the installation reference plane of the radiation source;

Step 4: Place the sample to be tested in the radiation field and adjust its position until the light spot of the rangefinder is irradiated on the sample to be tested and the distance displayed by the rangefinder is consistent with the pre-set length measurement reference, thus completing the measurement of the distance between the radiation source and the sample to be tested.

Furthermore, in step 3, the arc-shaped mounting piece of the mounting bracket is mounted on the slide rail of the arc segment by magnetic attraction.

In addition, the present invention also provides another gamma ray irradiation test distance measuring device, which is used to measure the distance between the sample to be tested and the radiation source, and its special features are:

It includes a fixing ring and a distance measuring unit;

The fixing ring is sleeved on the outside of the radiation source shield, and comprises two circular arc segments connected to each other, and the outer arc surfaces of the circular arc segments are respectively provided with sliding rails;

The distance measuring unit comprises a measuring rod and an arc-shaped mounting member;

One end of the measuring rod is fixed vertically to the outer arc surface of the arc-shaped mounting piece along the radial direction, and the other end is used to contact the surface of the sample to be measured; the inner arc surface of the arc-shaped mounting piece is slidably connected to the slide rail of the circular arc segment.

Furthermore, a plurality of grooves are evenly distributed on the inner arc surface of the arc-shaped mounting piece, and a magnet is respectively arranged in each groove. Under the action of the magnet, the inner arc surface of the arc-shaped mounting piece is magnetically attracted to the slide rail of the circular arc segment.

Furthermore, there are multiple distance measuring units, and a distance mark is provided on the arc-shaped mounting piece of each distance measuring unit. The distance mark corresponds to measuring rods of different lengths, and the length of the measuring rod is 2 to 18 cm.

Furthermore, one end of the two arc segments is hinged to each other, and the outer side of the other end is provided with a connecting lug, and the connecting lug is provided with a connecting hole, and the other ends of the two arc segments are fixedly connected by screws passing through the connecting holes.

At the same time, the present invention also provides another γ-ray irradiation test distance measurement method, which uses the above-mentioned another γ-ray irradiation test distance measurement device, and its special feature is that it includes the following steps:

Step 1: Install the fixing ring on the source shield of the radiation source;

Step 2: According to the distance requirement between the sample to be tested and the radiation source, select a measuring rod of corresponding length, and install the arc-shaped mounting piece on the slide rail of the arc segment so that the measuring rod is parallel to the installation reference plane of the radiation source;

Step 3: Place the sample to be tested in the radiation field and adjust its position until the end of the measuring rod away from the radiation source contacts the surface of the sample to be tested, thus completing the measurement of the distance between the radiation source and the sample to be tested.

Compared with the prior art, the present invention has the following beneficial effects:

1. The gamma-ray irradiation test distance measuring device of the present invention comprises a fixing ring and a distance measuring unit, the distance measuring unit comprises a distance meter and a mounting bracket, the mounting bracket comprises a support frame and an arc-shaped mounting member, one end portion of the support frame is vertically mounted on the outer arc surface of the arc-shaped mounting member in a radial direction, the inner arc surface of the arc-shaped mounting member is slidably connected to the slide rail of the circular arc segment, the distance meter is mounted in the mounting groove of the support frame, the overall structure is simple, and the installation is convenient. Compared with the existing distance measuring method, the distance between the sample to be tested and the radiation source can be accurately measured, thereby ensuring the effective implementation of the irradiation test.

2. The gamma-ray irradiation test distance measuring device of the present invention can also be designed to include a measuring rod and an arc-shaped mounting member, one end of the measuring rod is vertically fixed to the outer arc surface of the arc-shaped mounting member along the radial direction, and the other end is used to contact the surface of the sample to be tested, and the inner arc surface of the arc-shaped mounting member is slidably connected to the slide rail of the circular arc segment, thereby providing another distance measuring device that can quickly and accurately measure the distance between the sample to be tested and the radiation source.

3. The gamma-ray irradiation test ranging device of the present invention has a plurality of grooves evenly distributed on the inner arc surface of the arc-shaped mounting part, and a magnet is provided in each groove. The inner arc surface of the arc-shaped mounting part is magnetically attracted to the slide rail of the arc segment under the action of the magnet, thereby improving the installation efficiency of the ranging unit during measurement, and further improving the measurement efficiency.

4. In the gamma-ray irradiation test distance measuring device of the present invention, one end of the two arc segments of the fixing ring is hinged to each other, and the other end is connected by screws and connecting ears. This design can adjust the height and angle of the fixing ring according to the placement position of the sample to be tested, thereby avoiding the occurrence of a test blind area.

5. The gamma-ray irradiation test distance measurement method of the present invention pre-sets the measurement reference of the distance meter or selects a measuring rod of corresponding length to ensure that the distance between the sample to be tested and the radiation source meets the requirements of the irradiation test. The distance measurement method is simple, highly accurate, and has strong applicability.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a first embodiment of a gamma-ray irradiation test distance measuring device according to the present invention.

FIG. 2 is a schematic diagram of the structure of a fixed ring in the first embodiment of the gamma-ray irradiation test distance measuring device of the present invention.

FIG3 is a schematic diagram of the structure of the mounting bracket in the first embodiment of the gamma-ray irradiation test distance measuring device of the present invention.

FIG. 4 is a reference diagram of the use status of the rangefinder in the first embodiment of the gamma-ray irradiation test rangefinder of the present invention.

FIG5 is a schematic diagram of the structure of a distance measuring unit in the second embodiment of the gamma-ray irradiation test distance measuring device of the present invention.

The reference numerals are as follows:

1-fixing ring, 11-arc segment, 12-connecting lug, 2-distance meter, 3-mounting bracket, 31-support frame, 32-arc mounting piece, 321-groove, 322-magnet, 4-measuring rod.

Detailed ways

The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

Embodiment 1

1 to 3 , this embodiment provides a distance measuring device for a gamma-ray irradiation test, which is used to measure the distance between a sample to be tested and a radiation source. The distance measuring device includes a fixing ring 1 and a distance measuring unit.

The fixing ring 1 is sleeved on the outer side of the source shield of the radiation source, and includes two circular arc segments 11 connected to each other, one end of the two circular arc segments 11 is hinged to each other, and the outer side of the other end is respectively provided with connecting ears 12, and the connecting ears 12 are respectively provided with connecting holes, and screws are passed through the connecting holes to fix the other ends of the two circular arc segments 11. Slide rails are also respectively provided on the outer arc surfaces of the circular arc segments 11.

The distance measuring unit includes a distance meter 2 and a mounting bracket 3, and the mounting bracket 3 includes a support frame 31 and an arc-shaped mounting member 32. One end of the support frame 31 is vertically mounted on the outer arc surface of the arc-shaped mounting member 32 in the radial direction, and the inner arc surface of the arc-shaped mounting member 32 is slidably connected to the slide rail of the arc segment 11; a mounting groove is provided on the support frame 31, and the distance meter 2 is installed in the mounting groove, and the measuring end of the distance meter 2 is away from the radiation source and toward the sample to be measured, and the distance meter 2 is used to determine the placement position of the sample to be measured. Generally, the distance meter 2 is used to measure the distance of 16.6cm to 50m, and the measurement accuracy is generally ±1.5mm, which is relatively high.

A plurality of grooves 321 are evenly distributed on the inner arc surface of the arc-shaped mounting member 32 . A magnet 322 is installed in each groove 321 . The inner arc surface of the arc-shaped mounting member 32 is magnetically attracted to the slide rail of the arc segment 11 by the magnet 322 .

At the same time, this embodiment also provides a gamma ray irradiation test distance measurement method, comprising the following steps:

Step 1. Install the fixing ring 1 on the source cover of the radiation source. Generally, the upper edge of the fixing ring should be basically aligned with the marking line on the source cover. Use screws to pass through the connecting holes on the two arc segments 11 in sequence, and tighten the nuts to secure the fixing ring 1 to the source cover to prevent it from slipping.

Step 2: Preset the length measurement reference of the rangefinder 2 according to the distance requirement between the sample to be measured and the radiation source. The rangefinder 2 can be a commonly used laser rangefinder. The setting method is to turn on the laser rangefinder, select length measurement, set the measurement mode to continuous measurement, and select the bottom of the rangefinder as the measurement reference. Then install the rangefinder 2 on the support frame 31 of the mounting bracket 3, so that the measuring end of the rangefinder 2 is away from the radiation source and toward the sample to be measured.

Step 3, install the arc-shaped mounting member 32 of the mounting bracket 3 on the slide rail of the arc segment 11 by magnetic attraction, so that the optical path of the emitted light of the rangefinder 2 is parallel to the installation reference plane of the radiation source. After installation, check the level mark of the laser rangefinder. If the level mark is green, the distance can be measured normally. If it is yellow, the position of the fixing ring 1 should be readjusted so that its upper edge coincides with the marking line on the source cover. The specific adjustment method is the same as step 1.

Step 4: Place the sample to be measured in the radiation field and adjust its position until the light spot of the rangefinder 2 shines on the sample to be measured and the distance displayed by the rangefinder 2 matches the preset length measurement reference, thus completing the measurement of the distance between the radiation source and the sample to be measured.

After the distance measurement is completed, mark the position of the sample to be measured, turn off the distance meter 2, remove the distance meter 2 and the mounting bracket 3 from the fixing ring 1, and then remove the fixing ring 1 from the source cover, and then start the irradiation test.

In this embodiment, as shown in FIG4 , L is the position distance of the irradiation test dose rate, and the distance displayed by the rangefinder 2 is L _J , R is the radius of the source cover, and L ₁ is the vertical distance from the center of the source cover to the end surface of the rangefinder 2 close to the source cover, then:

L＝L _J +L ₁ -R

In actual use, what is measured is L _J , so after measuring L _J , the difference between L ₁ and R (the difference in this embodiment is 1.6 cm) should be added to obtain the position distance of the dose rate. For example, when the dose rate is 50 rad(Si)/s, the position distance L is 50.5 cm, and when using a distance meter, the distance displayed by the distance meter should be 48.9 cm.

It should be noted that it is strictly forbidden to shoot the laser directly into the human eye during the distance measurement using the rangefinder 2. In addition, after the distance measurement is completed, the fixing ring and the distance measuring unit must be removed from the source cover, otherwise the radiation source will be blocked, resulting in inaccurate dose rate during the irradiation test.

Embodiment 2

This embodiment provides another distance measuring device for gamma ray irradiation test, comprising a fixing ring 1 and a distance measuring unit. The difference from the first embodiment is that the distance measuring unit comprises a measuring rod 4 and an arc-shaped mounting member 32 (as shown in FIG. 5 ).

Since the shortest measuring distance of the laser rangefinder is 15 cm, when the dose rate position distance is less than 16.6 cm, other methods need to be used to measure the distance. In this embodiment, a measuring block composed of a measuring rod 4 and an arc-shaped mounting member 32 (i.e., representing the above-mentioned distance measuring unit) is selected for measurement. One end of the measuring rod 4 is fixed vertically to the outer arc surface of the arc-shaped mounting member 32 in the radial direction, and the other end is used to contact the surface of the sample to be measured; the inner arc surface of the arc-shaped mounting member 32 is slidably connected to the slide rail of the circular arc segment 11.

A plurality of grooves 321 are evenly distributed on the inner arc surface of the arc-shaped mounting member 32 . A magnet 322 is disposed in each groove 321 . The inner arc surface of the arc-shaped mounting member 32 is magnetically attracted to the slide rail of the arc segment 11 by the magnet 322 .

Distance marks are provided on the arc-shaped mounting member 32, and the distance marks correspond to measuring rods 4 of different lengths. The length of the measuring rod 4 is 2 to 18 cm, and there is a measuring block every 0.5 cm. The measuring block of the corresponding length is selected according to the specific measurement requirements. For example, when the dose rate is 300 rad(Si)/s and the position distance L is 3.5 cm, a measuring block marked as 3.5 cm can be selected. The measurement accuracy of the measuring block is generally ±1 mm.

At the same time, this embodiment also provides a gamma ray irradiation test distance measurement method based on a measurement block. The specific method is similar to the distance measurement method of the first embodiment, and includes the following steps:

Step 1: Install the fixing ring 1 on the source shield of the radiation source.

Step 2: According to the distance requirement between the sample to be tested and the radiation source, select a measuring rod 4 of corresponding length (i.e. select a measuring block of corresponding length), and install the arc-shaped mounting member 32 on the slide rail of the arc segment 11 by magnetic attraction, so that the measuring rod 4 is parallel to the installation reference plane of the radiation source.

Step 3: Place the sample to be tested in the radiation field and adjust the position of the sample to be tested until the end of the measuring rod 4 away from the radiation source contacts the surface of the sample to be tested, thus completing the measurement of the distance between the radiation source and the sample to be tested.

After the distance measurement is completed, mark the position of the sample to be measured, remove the distance measuring block from the fixing ring 1, and then remove the fixing ring 1 from the source cover, and then start the irradiation test.

Based on the above embodiments, ordinary technicians are sufficient to implement the present invention through the contents of the present invention. Within the framework of the claims, any improvement based on the idea of the present invention is deemed to fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides a gamma ray irradiation test range unit for measure the distance between sample and the radiation source that awaits measuring, its characterized in that:

comprises a fixed ring (1) and a ranging unit;

the fixing ring (1) is sleeved outside a source protection cover of the radiation source and comprises two arc sections (11) which are connected with each other, and sliding rails are respectively arranged on the outer cambered surfaces of the arc sections (11);

the ranging unit comprises a range finder (2) and a mounting bracket (3), wherein the mounting bracket (3) comprises a supporting frame (31) and an arc-shaped mounting piece (32);

one end of the supporting frame (31) is vertically arranged on the outer cambered surface of the arc-shaped mounting piece (32) along the radial direction, and the inner cambered surface of the arc-shaped mounting piece (32) is in sliding connection with the sliding rail of the arc section (11); the support frame (31) is provided with a mounting groove, a distance meter (2) is mounted in the mounting groove, the measuring end of the distance meter (2) is far away from the radiation source and faces to the sample to be measured, and the distance meter (2) is used for determining the placement position of the sample to be measured.

2. The gamma-ray irradiation test ranging apparatus as claimed in claim 1, wherein:

a plurality of grooves (321) are uniformly distributed on the inner cambered surface of the arc-shaped mounting piece (32), a magnet (322) is respectively mounted in each groove (321), and the inner cambered surface of the arc-shaped mounting piece (32) is magnetically attracted with the sliding rail of the arc section (11) under the action of the magnet (322).

3. The gamma-ray irradiation test ranging apparatus according to claim 1 or 2, wherein:

one end of the two arc sections (11) is hinged with each other, the outer sides of the other ends of the two arc sections are respectively provided with a connecting lug (12), the connecting lugs (12) are respectively provided with connecting holes, and screws penetrate through the connecting holes to fixedly connect the other ends of the two arc sections (11).

4. A gamma ray irradiation test ranging method using the gamma ray irradiation test ranging apparatus as claimed in claim 1 or 2 or 3, comprising the steps of:

step 1, mounting a fixed ring (1) on a source protection cover of a radiation source;

step 2, presetting a length measurement reference of the range finder (2) according to the distance requirement of a sample to be measured and a radiation source, and then installing the range finder (2) on a support frame (31) of a mounting bracket (3) so that the measurement end of the range finder (2) is far away from the radiation source and faces the sample to be measured;

step 3, installing an arc-shaped installation piece (32) of the installation bracket (3) on a sliding rail of the arc section (11) so that a light path of the emergent light of the range finder (2) is parallel to an installation reference plane of the radiation source;

and 4, placing the sample to be measured in a radiation field, and adjusting the position of the sample to be measured until the light spot of the light emitted by the range finder (2) irradiates the sample to be measured, and the distance displayed by the range finder (2) accords with a preset length measurement standard, so that the measurement of the distance between the radiation source and the sample to be measured is completed.

5. The gamma ray irradiation test ranging method according to claim 4, wherein:

in the step 3, the arc-shaped mounting piece (32) of the mounting bracket (3) is mounted on the sliding rail of the arc section (11) in a magnetic attraction manner.

6. The utility model provides a gamma ray irradiation test range unit for measure the distance of sample and radiation source to be tested, its characterized in that:

comprises a fixed ring (1) and a ranging unit;

the fixing ring (1) is sleeved outside a source protection cover of the radiation source and comprises two arc sections (11) which are connected with each other, and sliding rails are respectively arranged on the outer cambered surfaces of the arc sections (11);

the ranging unit comprises a measuring rod (4) and an arc-shaped mounting piece (32);

one end part of the measuring rod (4) is vertically fixed on the outer cambered surface of the arc-shaped mounting piece (32) along the radial direction, and the other end part is used for being contacted with the surface of the sample to be measured; the inner cambered surface of the arc-shaped mounting piece (32) is in sliding connection with the sliding rail of the arc section (11).

7. The gamma-ray irradiation test ranging apparatus as set forth in claim 6, wherein:

a plurality of grooves (321) are uniformly distributed on the inner cambered surface of the arc-shaped mounting piece (32), a magnet (322) is arranged in each groove (321), and the inner cambered surface of the arc-shaped mounting piece (32) is magnetically attracted with the sliding rail of the arc section (11) under the action of the magnet (322).

8. The gamma-ray irradiation test ranging apparatus as set forth in claim 7, wherein:

the distance measuring units are multiple, the arc-shaped mounting piece (32) of each distance measuring unit is provided with a distance mark, the distance marks correspond to measuring rods (4) with different lengths, and the length of each measuring rod (4) is 2-18 cm.

9. The gamma-ray irradiation test ranging apparatus as set forth in claim 8, wherein:

one end of the two arc sections (11) is hinged with each other, the outer sides of the other ends of the two arc sections are respectively provided with a connecting lug (12), the connecting lugs (12) are respectively provided with connecting holes, and screws penetrate through the connecting holes to fixedly connect the other ends of the two arc sections (11).

10. A gamma ray irradiation test ranging method using the gamma ray irradiation test ranging apparatus according to any one of claims 6 to 9, comprising the steps of:

step 1, mounting a fixed ring (1) on a source protection cover of a radiation source;

step 2, selecting a measuring rod (4) with a corresponding length according to the distance requirement of a sample to be measured and a radiation source, and installing an arc-shaped installation piece (32) on a sliding rail of the arc section (11) so that the measuring rod (4) is parallel to an installation reference surface of the radiation source;

and 3, placing the sample to be measured in a radiation field, and adjusting the position of the sample to be measured until one end of the measuring rod (4) far away from the radiation source is contacted with the surface of the sample to be measured, thereby finishing the measurement of the distance between the radiation source and the sample to be measured.