CN207181705U - A kind of nuclear matter pedestrian monitoring system for keeping sensitivity uniformity - Google Patents
A kind of nuclear matter pedestrian monitoring system for keeping sensitivity uniformity Download PDFInfo
- Publication number
- CN207181705U CN207181705U CN201721124018.8U CN201721124018U CN207181705U CN 207181705 U CN207181705 U CN 207181705U CN 201721124018 U CN201721124018 U CN 201721124018U CN 207181705 U CN207181705 U CN 207181705U
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- China
- Prior art keywords
- plastic scintillant
- monitoring system
- photomultiplier
- nuclear matter
- pedestrian monitoring
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Abstract
The utility model discloses a kind of nuclear matter pedestrian monitoring system for keeping sensitivity uniformity, including structure is identical and the first plastic scintillant and the second plastic scintillant that are oppositely arranged；First plastic scintillant and the second plastic scintillant are cube structure；The upper surface of first plastic scintillant and the lower surface of the second plastic scintillant are generally aligned in the same plane；The lower surface of first plastic scintillant is provided with the first photomultiplier, and the second plastic scintillant upper surface is provided with the second photomultiplier；First photomultiplier and the second photomultiplier connection signal condition unit；Signal condition unit connects data processing unit；The utility model is simple in construction, cost is low, and sensitivity uniformity is good.
Description
Technical field
It the utility model is related to radiation safety monitoring field, and in particular to a kind of nuclear matter for keeping sensitivity uniformity
Pedestrian monitoring system.
Background technology
In order to implement effective management and control to nuclear matter, many countries set radioactivity at the gateway of region closure circumference
Monitoring device, to being used for quickly detecting by the personnel of gateway, to ensure that the nuclear matters such as uranium, plutonium are not shifted illegally；It is domestic
There is nuclear matter pedestrian monitoring system Related product outside, can be only fitted at the protection system and customs of nuclear facilities；Can be fast
It is fast that radioexmination nondestructively effectively is carried out to the pedestrian passed through, judge whether it carries nuclear matter；So as to take precautions against core to be effective
The illegal carrying and transfer of material provide efficient, reliable safety check means, reduce to public's health and social stability
Potential threat；Existing device, because its plastic scintillant is longer, if the incoming particle apart from light bleeding point farther out,
So it cause photon caused by plastic scintillant reach light bleeding point light path it is just longer, optical signal can by very big decay,
Cause the reduction of photon collection efficiency, so as to cause plastic scintillant to reduce gamma-ray detection efficient；Sent out in performance test
Existing, in the case of radioactive source and plastic scintillant test surface vertical range identical, radioactive source is away from photomultiplier distalmost end ratio
The detection efficient of most proximal end is much lower, and this just directly results in altitude range of the nuclear matter pedestrian monitoring system in search coverage
It is interior；γ detectivity uniformity is undesirable.
Utility model content
The utility model provides a kind of nuclear matter pedestrian monitoring system of holding sensitivity uniformity simple in construction, cost is low
System.
The technical solution adopted in the utility model is：A kind of nuclear matter pedestrian monitoring system for keeping sensitivity uniformity,
Including the first plastic scintillant and the second plastic scintillant that structure is identical and is oppositely arranged；First plastic scintillant and the second modeling
Material scintillator is cube structure；The upper surface of first plastic scintillant and the lower surface of the second plastic scintillant are positioned at same flat
Face；The lower surface of first plastic scintillant is provided with the first photomultiplier, and the second plastic scintillant upper surface is provided with second
Photomultiplier；First photomultiplier and the second photomultiplier connection signal condition unit；Signal condition unit connects number
According to processing unit.
Further, in addition to acousto-optic instruction device, acousto-optic instruction device connect data processing unit.
Further, in addition to communication module, communication module connect data processing unit and remote control center.
Further, in addition to camera, camera connect remote control center by communication module.
The beneficial effects of the utility model are：
（1）The utility model γ detectivities uniformity is good；
（2）Institute's Photoelectric multiplier tube is changed into two from four in the utility model, required plastic scintillant contraction in length, drops
The low cost of manufacture of monitoring system.
Brief description of the drawings
Fig. 1 is the utility model structure diagram.
Fig. 2 is test result schematic diagram in the utility model embodiment.
In figure：The plastic scintillants of 101- first, the photomultipliers of 102- first, 103- signal condition units, 104- data
Processing unit, the plastic scintillants of 105- second, the photomultipliers of 106- second.
Embodiment
The present invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of nuclear matter pedestrian monitoring system for keeping sensitivity uniformity, including structure are identical and relative
The first plastic scintillant 101 and the second plastic scintillant 105 set；First plastic scintillant 101 and the second plastic scintillant
105 be cube structure；The upper surface of first plastic scintillant 101 and the lower surface of the second plastic scintillant 105 are positioned at same
Plane；The lower surface of first plastic scintillant 101 is provided with the first photomultiplier 102, the upper surface of the second plastic scintillant 105
It is provided with the second photomultiplier 106；First photomultiplier 102 and the second photomultiplier 106 connection signal condition unit
103；Signal condition unit 103 connects data processing unit 104.
In use, when the gamma-rays that radioactive source is sent enters plastic scintillant, plastic scintillant is set to produce fluorescence, photon is beaten
Photoelectron is formed to photomultiplier, after electronics is doubled in photomultiplier by bleeder circuit, in photomultiplier
Pulse signal is formed in anode loop；The pulse signal of formation carries out the amplification of signal, filtering etc. by signal condition unit 103
After processing, obtain radiating source data information, radioactive source data information transfer to data processing unit 104, data processing unit 104
Corresponding data is stored, and judges radioactive anomaly situation.
Further, in addition to acousto-optic instruction device, acousto-optic instruction device connect data processing unit 104；Pass through setting
Acousto-optic instruction device, alarm signal can be sent when data processing unit 104 judges radiation source data information exception.
Further, in addition to communication module, communication module connect data processing unit 104 and remote control center；It is logical
Remote control center is crossed in real time to be monitored monitoring system.
Further, in addition to camera, camera connect remote control center by communication module；Imaged by setting
Head connection remote control center, can be monitored in real time to monitoring situation.
To the system modified sensitivity uniformity test, comprise the following steps：
Step 1：Measure the background counting rate of simultaneously record monitoring system；
Step 2：Radioactive source is placed at the 1# on Fig. 1 center lines；
Step 3：Measure and calculate the source counting rate of monitoring system；
Step 4：Radioactive source is moved up along center line, is respectively placed in 2#~9# positions, repeat step 3 at each point；
Step 5：Test result is drawn, as shown in Figure 2.
As can be seen from Figure 2 sensitivity holding consistency meets relevant criterion requirement within 15%.
The length of plastic scintillant selected by the utility model is the half of search coverage altitude range, and fixed position is
One on the other, the half of search coverage altitude range is each covered；Positioned at the upper surface of the first plastic scintillant 101 of lower and position
It is generally aligned in the same plane in the lower surface of the second plastic scintillant 105 of eminence, this design can improve nuclear matter pedestrian monitoring system
The γ detectivity uniformity of system；Institute's Photoelectric multiplier tube only needs two, reduces the system of nuclear matter pedestrian monitoring system
Make cost；And so set one on the other, the length of plastic scintillant can be reduced, reduce further nuclear matter pedestrian prison
The cost of manufacture of examining system.
Claims (4)
1. a kind of nuclear matter pedestrian monitoring system for keeping sensitivity uniformity, it is characterised in that identical and relative including structure
The first plastic scintillant (101) and the second plastic scintillant (105) set；First plastic scintillant (101) and the second plastics
Scintillator (105) is cube structure；Under the upper surface and the second plastic scintillant (105) of first plastic scintillant (101)
Surface is generally aligned in the same plane；The lower surface of first plastic scintillant (101) is provided with the first photomultiplier (102), the second modeling
Material scintillator (105) upper surface is provided with the second photomultiplier (106)；First photomultiplier (102) and the second photoelectricity times
Increase pipe (106) connection signal condition unit (103)；Signal condition unit (103) connection data processing unit (104).
A kind of 2. nuclear matter pedestrian monitoring system for keeping sensitivity uniformity according to claim 1, it is characterised in that
Also include acousto-optic instruction device, acousto-optic instruction device connection data processing unit (104).
A kind of 3. nuclear matter pedestrian monitoring system for keeping sensitivity uniformity according to claim 1, it is characterised in that
Also include communication module, communication module connection data processing unit (104) and remote control center.
A kind of 4. nuclear matter pedestrian monitoring system for keeping sensitivity uniformity according to claim 3, it is characterised in that
Also include camera, camera connects remote control center by communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721124018.8U CN207181705U (en) | 2017-09-04 | 2017-09-04 | A kind of nuclear matter pedestrian monitoring system for keeping sensitivity uniformity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721124018.8U CN207181705U (en) | 2017-09-04 | 2017-09-04 | A kind of nuclear matter pedestrian monitoring system for keeping sensitivity uniformity |
Publications (1)
| Publication Number | Publication Date |
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| CN207181705U true CN207181705U (en) | 2018-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721124018.8U Active CN207181705U (en) | 2017-09-04 | 2017-09-04 | A kind of nuclear matter pedestrian monitoring system for keeping sensitivity uniformity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683187A (en) * | 2019-02-26 | 2019-04-26 | 中国测试技术研究院 | X/ γ and β personal dose equivalent measurement method based on stacked detecting structure |
-
2017
- 2017-09-04 CN CN201721124018.8U patent/CN207181705U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683187A (en) * | 2019-02-26 | 2019-04-26 | 中国测试技术研究院 | X/ γ and β personal dose equivalent measurement method based on stacked detecting structure |
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