CN216900950U - Inert gas detection device - Google Patents
Inert gas detection device Download PDFInfo
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- CN216900950U CN216900950U CN202220177767.1U CN202220177767U CN216900950U CN 216900950 U CN216900950 U CN 216900950U CN 202220177767 U CN202220177767 U CN 202220177767U CN 216900950 U CN216900950 U CN 216900950U
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- photomultiplier
- inert gas
- circuit board
- control circuit
- plastic scintillator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model discloses an inert gas detection device which comprises a sampling gas chamber, wherein a first plastic scintillator is arranged at the upper part of the sampling gas chamber, a first photomultiplier and a second photomultiplier are arranged at the upper part of the first plastic scintillator, the first photomultiplier and the second photomultiplier are both connected with a first control circuit board, an opening is formed in the first plastic scintillator, the second plastic scintillator extending into the sampling gas chamber penetrates through the opening, a third photomultiplier is arranged at the upper part of the second plastic scintillator, and the third photomultiplier is connected with a second control circuit board. The utility model has simple structure, reasonable design and convenient realization, can be effectively applied to the detection of inert gas in the exhaust gas of the nuclear power station chimney, has high detection efficiency, wide detection range and good use effect, and is convenient for popularization and use.
Description
Technical Field
The utility model belongs to the technical field of radiation monitoring, and particularly relates to an inert gas detection device.
Background
In order to protect personnel and public places of the nuclear power plant from radioactive radiation, the nuclear power plant is provided with a radiation monitoring system (hereinafter referred to as KRT system) for continuously monitoring the nuclear power plant area and suspended matters in the air, and the radioactivity of the nuclear power plant process and effluent.
The emission gas of the nuclear power station chimney includes various ray types, such as beta rays and gamma rays from inert gas, which are generally limited by the influence of a pulse counter and a front-end processing circuit in an electronics part, and a single detector has a narrow detection range, generally 3.7 × 10, for the inert gas3～3.7×109Bq/m3And the detection range cannot meet the radioactivity monitoring requirement of the nuclear power station on the exhaust gas of the chimney.
In the prior art, a wide-range inert gas detection device which is simple in structure and reasonable in design and can be used for detecting the exhaust gas of the chimney of the nuclear power station is lacked.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing an inert gas detection device aiming at the defects in the prior art, which has the advantages of simple structure, reasonable design, convenient realization, high detection efficiency, wide detection range, good use effect and convenient popularization and use, and can be effectively applied to the detection of inert gas in the exhaust gas of a nuclear power station chimney.
In order to solve the technical problems, the utility model adopts the technical scheme that: the utility model provides an inert gas detection device, includes the sample air chamber, sample air chamber upper portion is provided with first plastics scintillator, the upper portion of first plastics scintillator is provided with first photomultiplier and second photomultiplier, first photomultiplier and second photomultiplier all are connected with first control circuit board, be provided with the trompil on the first plastics scintillator, it has the second plastics scintillator that stretches into in the sample air chamber to run through in the trompil, the upper portion of second plastics scintillator is provided with the third photomultiplier, the third photomultiplier is connected with second control circuit board.
In the above inert gas detection device, the sampling air chamber is connected with the air inlet pipe and the air outlet pipe.
In the inert gas detection device, the first photomultiplier tube, the second photomultiplier tube, the first control circuit board and the second control circuit board are arranged in the shielding shell.
In the above inert gas detection apparatus, the first plastic scintillator has a flat plate shape, and the second plastic scintillator has a cylindrical shape.
In the inert gas detection device, the bottom of the sampling air chamber is provided with the shock pad.
In the inert gas detection device, the surfaces of the first plastic scintillator and the second plastic scintillator are both provided with the aluminum films.
In the above inert gas detection device, the organic glass light guide is arranged on the side surface of the first plastic scintillator, which is close to the sampling gas chamber.
The inert gas detection device is characterized in that a first high-voltage module and a first detection signal processing module are integrated on the first control circuit board, the first high-voltage module provides high voltage for the first photomultiplier and the second photomultiplier, and the first detection signal processing module is connected with signal output ends of the first photomultiplier and the second photomultiplier.
Foretell inert gas detection device, second control circuit board integration has front end processor, second high pressure module and second detection signal processing module, the second high pressure module provides the high pressure for the third photomultiplier, second detection signal processing module is connected with the signal output part of third photomultiplier, first detection signal processing module and second detection signal processing module all are connected with the signal input part of front end processor.
In the above inert gas detection device, the sampling gas chamber is a constant volume gas chamber, and the volume of the constant volume gas chamber is about 3L.
Compared with the prior art, the utility model has the following advantages:
1. the utility model has simple structure, reasonable design and convenient realization.
2. The constant volume gas chamber is designed, so that the sampling of the gas discharged from the chimney of the nuclear power station can be realized.
3. The utility model designs a first flat plastic scintillator, which is matched with a first photomultiplier and a second photomultiplier to realize the detection range of inert gas to be the general span with six orders of magnitude in a pulse counting mode.
4. The utility model designs a cylindrical second plastic scintillator to match with a third photomultiplier, realizes the detection of inert gas in a current integration mode, improves the upper limit of the detection range by three orders of magnitude, and expands the general six-order span into nine-order span.
5. The utility model can be effectively applied to the detection of inert gas in the exhaust gas of the chimney of the nuclear power station, has high detection efficiency, wide detection range and good use effect, and is convenient to popularize and use.
In conclusion, the device has the advantages of simple structure, reasonable design, convenience in implementation, high detection efficiency, wide detection range, good use effect and convenience in popularization and use, and can be effectively applied to detection of inert gases in the exhaust gas of the chimney of the nuclear power station.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a functional block diagram of a first control circuit board according to the present invention;
fig. 4 is a schematic block diagram of a first control circuit board of the present invention.
Description of reference numerals:
1-sampling air chamber; 2 — a first plastic scintillator; 3-a first photomultiplier tube;
4-a second photomultiplier tube; 5-a first control circuit board; 5-1 — a first high voltage module;
5-2-a first detection signal processing module; 6 — a second plastic scintillator; 7-a third photomultiplier tube;
8-a second control circuit board; 8-1-front end processor; 8-2 — a second high voltage module;
8-3-a second detection signal processing module; 9-an air inlet pipe; 10-air outlet pipe;
11-a shielding housing; 12-shock pad.
Detailed Description
As shown in fig. 1 and 2, the inert gas detection device of the present invention includes a sampling gas chamber 1, a first plastic scintillator 2 is disposed on an upper portion of the sampling gas chamber 1, a first photomultiplier tube 3 and a second photomultiplier tube 4 are disposed on an upper portion of the first plastic scintillator 2, both the first photomultiplier tube 3 and the second photomultiplier tube 4 are connected to a first control circuit board 5, an opening is disposed on the first plastic scintillator 2, a second plastic scintillator 6 extending into the sampling gas chamber 1 penetrates through the opening, a third photomultiplier tube 7 is disposed on an upper portion of the second plastic scintillator 6, and the third photomultiplier tube 7 is connected to a second control circuit board 8.
In specific implementation, the range of measuring the inert gas is realized in a pulse counting mode by matching the large-area first plastic scintillator 2 with the first photomultiplier tube 3 and the second photomultiplier tube 43.7×103～3.7×109Bq/m3The measuring range of 3.7 multiplied by 10 for measuring the inert gas is realized in a current integration way by matching the second plastic scintillator 6 with small area with the third photomultiplier 77～3.7×1012Bq/m3And finally, the detection range of the inert gas in the exhaust gas of the nuclear power station chimney is widened, and the detection range is expanded from six-order span to nine-order span.
In this embodiment, as shown in fig. 1, the sampling air chamber 1 is connected with an air inlet pipe 9 and an air outlet pipe 10.
During specific implementation, the exhaust gas of the chimney of the nuclear power station enters the sampling air chamber 1 through the air inlet pipe 9 and is discharged through the air outlet pipe 10.
In the present embodiment, as shown in fig. 2, the first photomultiplier tube 3 and the second photomultiplier tube 4, and the first control circuit board 5 and the second control circuit board 8 are disposed in the shield case 11.
In the present embodiment, the first plastic scintillator 2 is shaped like a flat plate, and the second plastic scintillator 5 is shaped like a cylinder.
In specific implementation, the active area of the first plastic scintillator 2 is larger than the active area of the second plastic scintillator 5.
In this embodiment, as shown in fig. 2, a shock absorbing pad 12 is disposed at the bottom of the sampling air chamber 1.
In this embodiment, the surfaces of the first plastic scintillator 2 and the second plastic scintillator 6 are both provided with aluminum films.
In specific implementation, the surface layers of the detection surfaces of the first plastic scintillator 2 and the second plastic scintillator 6 are respectively and closely attached to a 10-micrometer aluminum film for avoiding light and preventing crystal contamination, and the photomultiplier is favorable for collecting scintillation light.
In this embodiment, the first plastic scintillator 2 is provided with an organic glass light guide on the side surface close to the sampling gas chamber 1.
In particular implementation, the strength and light absorption efficiency of the first plastic scintillator 2 is improved by the plexiglas light guide.
In this embodiment, as shown in fig. 3, a first high voltage module 5-1 and a first detection signal processing module 5-2 are integrated on the first control circuit board 5, the first high voltage module 5-1 provides high voltage for both the first photomultiplier tube 3 and the second photomultiplier tube 4, and the first detection signal processing module 5-2 is connected to signal output ends of both the first photomultiplier tube 3 and the second photomultiplier tube 4.
In specific implementation, the signals collected by the first photomultiplier tube 3 and the second photomultiplier tube 4 are pre-amplified, screened and formed by the first detection signal processing module 5-2.
In this embodiment, as shown in fig. 4, the second control circuit board 8 is integrated with a front-end processor 8-1, a second high-voltage module 8-2, and a second detection signal processing module 8-3, the second high-voltage module 8-2 provides high voltage for the third photomultiplier tube 7, the second detection signal processing module 8-3 is connected to a signal output end of the third photomultiplier tube 7, and the first detection signal processing module 5-2 and the second detection signal processing module 8-3 are both connected to a signal input end of the front-end processor 8-1.
In specific implementation, the signal collected by the third photomultiplier tube 7 is amplified and VF-converted by the second detection signal processing module 8-3, and the front-end processor 8-1 receives the signals processed by the first detection signal processing module 5-2 and the second detection signal processing module 8-3.
In this embodiment, the sampling air chamber 1 is a constant volume air chamber, and the volume of the constant volume air chamber is about 3L.
When the device is used, the exhaust gas of the chimney of the nuclear power station enters the constant volume gas chamber 1 through the gas inlet pipe 9, and the first photomultiplier 3, the second photomultiplier 4 and the third photomultiplier 7 simultaneously perform reaction on the inert gas in the constant volume gas chamber 185Kr、133Xe emits beta rays in the decay process for detection, and the first photomultiplier tube 3 and the second photomultiplier tube 4 realize the detection range of 3.7 multiplied by 10 in a pulse counting mode3～3.7×109Bq/m3The third photomultiplier 7 realizes the detection range of 3.7 multiplied by 10 in a current integration mode7～3.7×1012Bq/m3The two are combined to finally realize the widening of the detection range of the inert gas in the exhaust gas of the nuclear power station chimney, and the detection range is formed by six numbersThe span of magnitude is expanded into nine magnitude spans; finally, the gas in the constant volume gas chamber 1 is discharged through the outlet pipe 10.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. An inert gas detection device, characterized in that: including sample air chamber (1), sample air chamber (1) upper portion is provided with first plastics scintillator (2), the upper portion of first plastics scintillator (2) is provided with first photomultiplier (3) and second photomultiplier (4), first photomultiplier (3) and second photomultiplier (4) all are connected with first control circuit board (5), be provided with the trompil on first plastics scintillator (2), it has second plastics scintillator (6) that stretch into in the sample air chamber (1) to run through in the trompil, the upper portion of second plastics scintillator (6) is provided with third photomultiplier (7), third photomultiplier (7) are connected with second control circuit board (8).
2. An inert gas detecting device according to claim 1, wherein: the sampling air chamber (1) is connected with an air inlet pipe (9) and an air outlet pipe (10).
3. An inert gas detecting device according to claim 1, wherein: the first photomultiplier (3) and the second photomultiplier (4) as well as the first control circuit board (5) and the second control circuit board (8) are all arranged in the shielding shell (11).
4. An inert gas detecting device according to claim 1, wherein: the first plastic scintillator (2) is plate-shaped, and the second plastic scintillator (6) is cylindrical.
5. An inert gas detecting device according to claim 1, wherein: and a shock pad (12) is arranged at the bottom of the sampling air chamber (1).
6. An inert gas detecting device according to claim 1, wherein: and aluminum films are arranged on the surfaces of the first plastic scintillator (2) and the second plastic scintillator (6).
7. An inert gas detecting device according to claim 1, wherein: and an organic glass light guide is arranged on the side surface, close to the sampling gas chamber (1), of the first plastic scintillator (2).
8. An inert gas detecting device according to claim 1, wherein: integrated first high voltage module (5-1) and first detection signal processing module (5-2) on first control circuit board (5), first high voltage module (5-1) all provides the high pressure for first photomultiplier (3) and second photomultiplier (4), first detection signal processing module (5-2) all are connected with the signal output part of first photomultiplier (3) and second photomultiplier (4).
9. An inert gas detecting device according to claim 8, wherein: the second control circuit board (8) is integrated with a front-end processor (8-1), a second high-voltage module (8-2) and a second detection signal processing module (8-3), the second high-voltage module (8-2) provides high voltage for a third photomultiplier (7), the second detection signal processing module (8-3) is connected with a signal output end of the third photomultiplier (7), and the first detection signal processing module (5-2) and the second detection signal processing module (8-3) are connected with a signal input end of the front-end processor (8-1).
10. An inert gas detecting apparatus according to claim 1, wherein: the sampling air chamber (1) is a constant volume air chamber, and the volume of the constant volume air chamber is about 3L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220177767.1U CN216900950U (en) | 2022-01-21 | 2022-01-21 | Inert gas detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220177767.1U CN216900950U (en) | 2022-01-21 | 2022-01-21 | Inert gas detection device |
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| CN216900950U true CN216900950U (en) | 2022-07-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115267876A (en) * | 2022-07-21 | 2022-11-01 | 陕西卫峰核电子有限公司 | Online monitoring device and method for radioactivity activity concentration in ventilation exhaust pipeline |
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2022
- 2022-01-21 CN CN202220177767.1U patent/CN216900950U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115267876A (en) * | 2022-07-21 | 2022-11-01 | 陕西卫峰核电子有限公司 | Online monitoring device and method for radioactivity activity concentration in ventilation exhaust pipeline |
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