CN221508100U - High specific activity small volume gas activity ionization chamber, measuring instrument and measuring system - Google Patents
High specific activity small volume gas activity ionization chamber, measuring instrument and measuring system Download PDFInfo
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- CN221508100U CN221508100U CN202323502638.9U CN202323502638U CN221508100U CN 221508100 U CN221508100 U CN 221508100U CN 202323502638 U CN202323502638 U CN 202323502638U CN 221508100 U CN221508100 U CN 221508100U
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Abstract
The utility model discloses a high specific activity small volume gas activity ionization chamber, a measuring instrument and a measuring system. The ionization chamber comprises a vacuum chamber and end covers which are connected with the left end and the right end of the vacuum chamber in a sealing way; the vacuum chamber is connected with an air inlet interface and an air outlet interface; a filament wall cathode and a central anode are axially arranged in the vacuum chamber; the central anode is positioned at the inner center of the filament wall cathode; the end covers at the two ends are ceramic electrode end covers and are reliably connected with the wire wall cathode and the central anode respectively; the volume of gas in the vacuum chamber is 10m l or less. The measuring instrument comprises the ionization chamber and an electronic signal processing circuit; the measuring system also comprises an upper computer. The ionization chamber adopts a small-volume design, has a compact structure, can be suitable for measuring high-specific-activity gas, does not need to carry out distribution dilution on the gas to be measured, and has simple measurement and wide measurement range; the small-volume ionization chamber is highly integrated with the electronic signal processing circuit, is convenient and reliable in wiring, and can be flexibly installed on various use occasions.
Description
Technical Field
The utility model relates to the technical field of gas activity measurement, in particular to a high-specific-activity small-volume gas activity ionization chamber, a measuring instrument and a measuring system.
Background
Ionization chambers are important devices for measuring radioactivity, often as a measure of the activity of radioactive gases.
The working principle is that when the ray irradiates the ionization chamber, the ray reacts with gas molecules in the ionization chamber to generate electron-positive ion pairs. DC polarized voltage is applied to the collector and the high voltage electrode of the ionization chamber to form electric field, and electrons and positive ions formed by ionization of gas molecules move to the two poles to form ionization current signals, which can be amplified and processed by electronic instruments and then used for determining the activity of the measured gas through corresponding calculation.
At present, most of domestic gas-flowing type ionization chamber researches are of a large-volume structure, and gas distribution dilution is usually needed to be carried out on gas to be measured before gas measurement with high specific activity, so that how to provide a gas activity ionization chamber under a specific environment aiming at the measurement with high specific activity, so that the gas-flowing type ionization chamber does not need to be subjected to gas distribution dilution, measurement is simple and convenient, and the gas-flowing type ionization chamber is an aim which is extremely needed to be improved in the current industry.
Disclosure of utility model
The utility model aims to provide a high-specific-activity small-volume gas activity ionization chamber, a measuring instrument and a measuring system, which are suitable for measuring high specific activity, do not need to perform distribution dilution on gas to be measured, and are simple and convenient to measure, so that the defects in the prior art are overcome.
In order to solve the technical problems, the utility model adopts the following technical scheme:
In one aspect, the utility model provides a high-specific-activity small-volume gas activity ionization chamber, which comprises a vacuum chamber and end covers which are connected with left and right ends of the shaft of the vacuum chamber in a sealing way; the vacuum chamber is connected with an air inlet interface and an air outlet interface; a filament wall cathode and a central anode are axially arranged in the vacuum chamber; the central anode is positioned at the center of the inner side of the filament wall cathode; the end covers at the two ends are ceramic electrode end covers and are respectively and reliably connected with the wire wall cathode and the central anode; the volume of gas in the vacuum chamber is 10ml or less.
As a further improvement of the utility model, the vacuum chamber is of a long tubular structure; the filament wall cathode is of a cylindrical structure, and holes are uniformly formed in the surface of the cylindrical structure.
Further, the vacuum chamber is made of stainless steel; and/or the wire wall cathode is made of brass; and/or the central anode adopts a copper rod.
Further, the air inlet interface and the air outlet interface are VCR interfaces; and/or cf flange interfaces are reserved at the left end and the right end of the vacuum chamber shaft, and are in sealing connection with the end covers.
In a second aspect, the present utility model provides a high specific activity small volume gas activity ionization chamber measuring apparatus, comprising the high specific activity small volume gas activity ionization chamber and an electronic signal processing circuit; the electronic signal processing circuit includes: the MCU processing unit is respectively connected with the signal amplifying unit, the high-voltage output unit and the serial port communication interface; the power supply interface is connected with the high-voltage output unit; the high-voltage output unit is connected with the wire wall cathode through a ceramic electrode and is used for introducing negative high voltage of 0 ～ -1000V into the wire wall cathode; the central anode is connected with the signal amplifying unit through a ceramic electrode and is used for introducing the electric signals collected by the central anode into the signal amplifying unit.
As a further improvement of the utility model, the utility model also comprises an outer shell, wherein the high specific activity small volume gas activity ionization chamber and the electronic signal processing circuit are integrated in the outer shell; the air inlet interface and the air outlet interface extend out of the outer shell, and the power supply interface and the serial communication interface are respectively arranged on the outer shell.
Further, the outer shell is a flat square box body, and the power interface and the serial port communication interface are respectively arranged on the side edge of the outer shell; the air inlet interface and the air outlet interface extend out of the upper end of the outer shell.
Further, the number of the serial communication interfaces is two.
In a third aspect, the utility model also provides a system for measuring the high-specific-activity small-volume gas activity ionization chamber, which comprises an upper computer and the high-specific-activity small-volume gas activity ionization chamber measuring instrument, wherein the upper computer is connected with a serial port communication interface.
As a further improvement, the utility model comprises a plurality of high-specific-activity small-volume gas activity ionization chamber measuring instruments, each high-specific-activity small-volume gas activity ionization chamber measuring instrument is provided with two serial communication interfaces, the upper computer is connected with the serial communication interface of one of the high-specific-activity small-volume gas activity ionization chamber measuring instruments, and the plurality of high-specific-activity small-volume gas activity ionization chamber measuring instruments are sequentially connected through the serial communication interfaces.
By adopting the technical scheme, the utility model has at least the following beneficial effects:
1. The ionization chamber adopts a small-volume design, has a compact structure, can be suitable for measuring high-specific-activity gas, does not need to distribute and dilute the gas to be measured, and has simple measurement.
2. The current measurement range can reach 1E-7A ～ E-11A, the measurable radioactivity range can reach 1E7 ～ E11Bq/L, and the measurement range is wide.
3. The small-volume ionization chamber is highly integrated with the electronic signal processing circuit, and wiring is convenient and reliable after integrated design, and the integrated ionization chamber can be flexibly installed on various use occasions.
4. The circuit design has two serial communication interfaces, and can support an upper computer to drive a multi-station measuring instrument to simultaneously perform on-line measurement.
Drawings
The foregoing is merely an overview of the present utility model, and the present utility model is further described in detail below with reference to the accompanying drawings and detailed description.
FIG. 1 is a schematic diagram of a high specific activity small volume gas activity ionization chamber in accordance with one embodiment of the present utility model;
FIG. 2 is a schematic diagram of a high specific activity small volume gas activity ionization chamber measurement instrument according to an embodiment of the present utility model;
FIG. 3 is a schematic block diagram of an electronic signal processing circuit according to an embodiment of the utility model.
In the figure: 1-a vacuum chamber; 2-end caps; 3-an air inlet interface; 4-an air outlet interface; 5-wire wall cathode; 6-a central anode, 7-a power interface; 8-serial port communication interfaces; 9-an outer shell.
Detailed Description
Exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.
As shown in fig. 1, the high specific activity small volume gas activity ionization chamber provided in this embodiment is suitable for the application requirements of high specific activity gas activity measurement with miniaturized gas flow type wide-range structure. Comprises a vacuum chamber 1, an end cover 2, an air inlet connector 3, an air outlet connector 4, a filament wall cathode 5 and a central anode 6.
The left end and the right end of the vacuum chamber 1 are in sealing connection with the end cover 2; the vacuum chamber 1 is connected with an air inlet port 3 and an air outlet port 4. A filament wall cathode 5 and a central anode 6 are axially arranged in the vacuum chamber 1; the central anode 6 is positioned at the inner center of the filament wall cathode 5. The end covers 2 at the two ends are ceramic electrode end covers and are reliably connected with the wire wall cathode 5 and the central anode 6 respectively. The volume of the gas in the vacuum chamber is less than 10m l, including but not limited to 10 ml, 5 ml or 3m l.
When the ceramic electrode is used, the matched circuit introduces negative high voltage into the wire wall cathode 5 through the ceramic electrode of the ceramic electrode end cover, and introduces the electric signal collected by the central anode 6 into the matched circuit.
In a preferred embodiment, the vacuum chamber 1 is integrally manufactured into a long tubular structure by using 316L stainless steel and welded with VCR interfaces (an inlet interface 3 and an outlet interface 4), and cf flange interfaces are reserved at two ends of the vacuum chamber 1. The wire wall cathode 5 is processed into a cylindrical structure by adopting a brass material, the surface of the brass cylindrical structure is polished after laser precision tapping, and the circumferential tapping is uniform, so that the uniformity of an electric field in an ionization chamber is ensured; the central anode 6 is machined by a copper bar.
The ionization chamber adopts a small-volume design, has a compact structure, can be suitable for measuring high-specific-activity gas, does not need to distribute and dilute the gas to be measured, and is simple to measure.
The embodiment also provides a measuring instrument for the high-specific-activity small-volume gas activity ionization chamber, which comprises the high-specific-activity small-volume gas activity ionization chamber (figure 1) and an electronic signal processing circuit (figure 3).
As shown in fig. 3, the electronic signal processing circuit includes: the MCU (micro controller) processing unit is respectively connected with the signal amplifying unit, the high-voltage output unit and the serial port communication interface; and the power supply interface is connected with the high-voltage output unit.
The high-voltage output unit is connected with the wire wall cathode 5 through a ceramic electrode and is used for introducing negative high voltage of 0 ～ -1000V into the wire wall cathode 5; the central anode 6 is connected with the signal amplifying unit through a ceramic electrode for introducing the electric signal collected by the central anode 6 into the signal amplifying unit.
In order to realize integration, the high-specific-activity small-volume gas activity ionization chamber (fig. 1) and the electronic signal processing circuit (fig. 3) can be integrated in an outer shell 9 of the measuring instrument shown in fig. 2, the outer shell 9 is preferably but not limited to a flat square box, the gas inlet interface 3 and the gas outlet interface 4 extend out from the upper end of the outer shell 9, and the power interface 7 and the serial communication interface 8 are respectively arranged at the side edges of the outer shell 9; the serial communication interfaces 8 are preferably two.
The electronic signal processing circuit can be controlled by an upper computer command. The embodiment also provides a high-specific-activity small-volume gas activity ionization chamber measuring system, which comprises an upper computer and the high-specific-activity small-volume gas activity ionization chamber measuring instrument, wherein the upper computer is connected with a serial port communication interface.
When in work, the electronic signal processing circuit controls the high-voltage output unit to realize (0 ～ -1000V) high-voltage regulation through the command of the upper computer and introduces high voltage into the ionization chamber wire wall cathode 5; under a high-voltage environment, the electric signals collected by the central anode 6 are led into the signal amplifying unit to be amplified and measured, and are converted into digital signals through the MCU processing unit, and then the digital signals are transmitted to an upper computer through a serial port communication interface (RS 485 RTU).
In order to improve the online measurement efficiency, a mode of simultaneously online measurement by a multi-station ionization chamber measuring instrument can also be adopted. If a plurality of high-specific-activity small-volume gas activity ionization chamber measuring instruments are adopted in the system, each high-specific-activity small-volume gas activity ionization chamber measuring instrument is provided with two serial communication interfaces, the plurality of high-specific-activity small-volume gas activity ionization chamber measuring instruments are sequentially connected through the serial communication interfaces, namely, one upper computer is connected with a first serial communication interface of a first measuring instrument, the other serial communication interface of the first measuring instrument is connected with a first serial communication structure of a second measuring instrument, the second serial communication interface of the second measuring instrument is connected with a first serial communication interface of a third measuring instrument, and so on. By arranging the multi-channel serial port communication interfaces, the multi-station ionization chamber can be supported to simultaneously utilize an upper computer for online measurement, and the measurement efficiency is greatly improved.
The above description is only of the preferred embodiments of the present utility model, and is not intended to limit the utility model in any way, and some simple modifications, equivalent variations or modifications can be made by those skilled in the art using the teachings disclosed herein, which fall within the scope of the present utility model.
Claims (10)
1. The high specific activity small volume gas activity ionization chamber is characterized by comprising a vacuum chamber and end covers which are connected with the left end and the right end of the vacuum chamber in a sealing way; the vacuum chamber is connected with an air inlet interface and an air outlet interface;
A filament wall cathode and a central anode are axially arranged in the vacuum chamber; the central anode is positioned at the center of the inner side of the filament wall cathode;
The end covers at the two ends are ceramic electrode end covers and are respectively and reliably connected with the wire wall cathode and the central anode;
the volume of gas in the vacuum chamber is 10ml or less.
2. The high specific activity small volume gas activity ionization chamber of claim 1 wherein said vacuum chamber is a long tubular structure; the filament wall cathode is of a cylindrical structure, and holes are uniformly formed in the surface of the cylindrical structure.
3. The high specific activity small volume gas activity ionization chamber of claim 1 wherein said vacuum chamber is of stainless steel;
and/or the wire wall cathode is made of brass;
And/or the central anode adopts a copper rod.
4. The high specific activity small volume gas activity ionization chamber of claim 1 wherein said inlet and outlet interfaces are VCR interfaces;
And/or cf flange interfaces are reserved at the left end and the right end of the vacuum chamber shaft, and are in sealing connection with the end covers.
5. A high specific activity small volume gas activity ionization chamber measurement instrument comprising the high specific activity small volume gas activity ionization chamber of any one of claims 1-4 and an electronic signal processing circuit;
The electronic signal processing circuit includes: the MCU processing unit is respectively connected with the signal amplifying unit, the high-voltage output unit and the serial port communication interface; the power supply interface is connected with the high-voltage output unit;
The high-voltage output unit is connected with the wire wall cathode through a ceramic electrode and is used for introducing negative high voltage of 0 ～ -1000V into the wire wall cathode;
The central anode is connected with the signal amplifying unit through a ceramic electrode and is used for introducing the electric signals collected by the central anode into the signal amplifying unit.
6. The high specific activity small volume gas activity ionization chamber measurement instrument of claim 5, further comprising an outer housing, the high specific activity small volume gas activity ionization chamber and electronic signal processing circuitry being integrated within the outer housing;
The air inlet interface and the air outlet interface extend out of the outer shell, and the power supply interface and the serial communication interface are respectively arranged on the outer shell.
7. The apparatus of claim 6, wherein the outer casing is a flat square box, and the power interface and the serial communication interface are respectively arranged at the side of the outer casing; the air inlet interface and the air outlet interface extend out of the upper end of the outer shell.
8. The high specific activity small volume gas activity ionization chamber measurement instrument of any one of claims 5-7, wherein there are two serial communication interfaces.
9. A high specific activity small volume gas activity ionization chamber measurement system, comprising an upper computer and the high specific activity small volume gas activity ionization chamber measurement instrument of any one of claims 5-8, wherein the upper computer is connected with a serial port communication interface.
10. The system of claim 9, comprising a plurality of high-specific-activity small-volume gas activity ionization chamber meters, each high-specific-activity small-volume gas activity ionization chamber meter having two serial communication interfaces, wherein the upper computer is connected to one of the serial communication interfaces of the high-specific-activity small-volume gas activity ionization chamber meters, and wherein the plurality of high-specific-activity small-volume gas activity ionization chamber meters are sequentially connected through the serial communication interfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323502638.9U CN221508100U (en) | 2023-12-21 | 2023-12-21 | High specific activity small volume gas activity ionization chamber, measuring instrument and measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323502638.9U CN221508100U (en) | 2023-12-21 | 2023-12-21 | High specific activity small volume gas activity ionization chamber, measuring instrument and measuring system |
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| Publication Number | Publication Date |
|---|---|
| CN221508100U true CN221508100U (en) | 2024-08-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323502638.9U Active CN221508100U (en) | 2023-12-21 | 2023-12-21 | High specific activity small volume gas activity ionization chamber, measuring instrument and measuring system |
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| Country | Link |
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| CN (1) | CN221508100U (en) |
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2023
- 2023-12-21 CN CN202323502638.9U patent/CN221508100U/en active Active
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