CN104730563A - Passage type personnel radioactivity monitor - Google Patents
Passage type personnel radioactivity monitor Download PDFInfo
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- CN104730563A CN104730563A CN201310724426.7A CN201310724426A CN104730563A CN 104730563 A CN104730563 A CN 104730563A CN 201310724426 A CN201310724426 A CN 201310724426A CN 104730563 A CN104730563 A CN 104730563A
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- crystal
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- 239000013078 crystal Substances 0.000 claims abstract description 61
- 238000012544 monitoring process Methods 0.000 claims abstract description 30
- XQPRBTXUXXVTKB-UHFFFAOYSA-M caesium iodide Chemical compound [I-].[Cs+] XQPRBTXUXXVTKB-UHFFFAOYSA-M 0.000 claims abstract description 29
- 238000004891 communication Methods 0.000 claims abstract description 7
- 230000005855 radiation Effects 0.000 claims description 22
- 239000000523 sample Substances 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 13
- 230000002285 radioactive effect Effects 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 12
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 abstract 1
- 229910052716 thallium Inorganic materials 0.000 abstract 1
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 235000009518 sodium iodide Nutrition 0.000 description 3
- 241000218606 Pinus contorta Species 0.000 description 2
- 230000002547 anomalous effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 235000000673 shore pine Nutrition 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Landscapes
- Measurement Of Radiation (AREA)
Abstract
The invention discloses a passage type personnel radioactivity monitor used for detecting whether personnel are infected with radioactivity during a site emergency after a nuclear accident or nuclear leakage. The passage type personnel radioactivity monitor comprises a passage and a remote monitoring platform, wherein the passage is used for monitoring radioactivity and is composed of two oppositely arranged detection units, the remote monitoring platform performs monitoring, displaying of a measuring result, data statistic analysis and system control on the passage, and the passage is connected with the remote monitoring platform through wireless communication. The passage type personnel radioactivity monitor adopts a large-size nondeliquescent cesium iodide scintillation crystal mixed with thallium as a detecting element, uses a stable and reliable photodiode as a photovoltaic conversion element, can effectively reduce a background and reduce noise through a signal addition and according method and a shielding function of a lead shield, and improves the signal to noise ratio, the detection efficiency and the sensitivity. The passage type personnel radioactivity monitor is high in sensitivity, accurate in monitoring, small in size, resistant to magnetic-field interference, stable, reliable and convenient to deploy, has a wireless communication function, and meets the site emergency requirements after the nuclear accident or nuclear leakage.
Description
Technical field
The present invention relates to a kind of radiation measurement assembly, when after particularly one is used for nuclear accident, nuclear leakage, scene is emergent, whether monitoring personnel are infected with radioactive channel-type personnel radiation monitor.
Background technology
Need channel radioactive testing product when scene is emergent after nuclear accident, nuclear leakage, quick radioexmination is carried out to the personnel passed through, judge wherein whether keep radiomaterial or be infected with radioactivity.The advantages such as adopt channel radioactive testing product during monitoring, have detection efficiency high, highly sensitive, reliability is high, convenient deployment.
Existing channel radioactive testing product is widely used in the radiological measuring of vehicle, pedestrian, luggage, product weight is large, volume is large, be fixed on specific occasion to use, the large-area plastic scintillant of most employing or sodium iodide scintillation crystal counter, and use photomultiplier as photo-electric conversion element.Plastic scintillant stable performance, not deliquescence, be easy to processing, but detection efficiency is lower, and for reaching higher sensitivity, need to adopt bulky plastic scintillator, small product size is large, and weight is large.Sodium iodide scintillation crystal good resolution, detection efficiency is Plastic scintillation height comparatively, but it has strong hygroscopy, and can give the use of crystal, structure and running environment bring many difficulties.In addition, existing channel radioactive testing product many employings photomultiplier is as photo-electric conversion element, and photomultiplier requires higher to environment for use, easily broken.
Cesium iodide,crystal scintillation crystal, not deliquescence, easily processing, density is high, average atomic number is large, Radiation Hardness is high, to gamma-ray detection efficiency than plastic scintillant and sodium iodide scintillation crystal high.Silicon photoelectric diode has the advantages such as condition of work restriction is little, the range of linearity is wide, spectral response is suitable, structure is simple, volume is little, lightweight, reliability is high, highly sensitive, the life-span is long, is now widely used.Cesium iodide,crystal scintillation crystal emission wavelength 560nm, extremely mates with the spectral response of silicon photoelectric diode.Cesium iodide,crystal scintillation crystal and silicon photo diode with the use of, have highly sensitive, volume is little, voltage is low, anti-magnetic interference, the advantage such as reliable and stable.At present, the channel-type personnel radiation monitor product adopting cesium iodide,crystal scintillation crystal detectors is seldom had.
Although existing channel radioactive testing product is highly sensitive, volume is large, be inconvenient to dispose, and the environmental suitability of product is bad, the requirement of on-the-spot Emergent detection after can not meeting nuclear accident, nuclear leakage very well.
Summary of the invention
The object of the present invention is to provide a kind of channel-type personnel radiation monitor, large for solving existing channel radioactive monitoring system volume, be inconvenient to dispose, environmental suitability is bad, the problem of on-the-spot Emergent detection requirement after can not meeting nuclear accident, nuclear leakage very well.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of channel-type personnel radiation monitor, whether radioactivity is infected with for testing staff when scene is emergent after nuclear accident, nuclear leakage, comprise carry out monitoring for monitoring passage described in radioactive passage of being made up of two probe units staggered relatively and a pair, measurement result shows, the remote monitoring platform of data statistic analysis and Systematical control, described passage and described remote monitoring platform are by wireless mutual communication connection.
Described probe unit comprises a chassis, and to install on described chassis and to have the housing of inner hollow, the shield be arranged in described housing, cesium iodide,crystal scintillation crystal, the first photodiode, the first prime amplifier, electricity subsystem, the alarm lamp be connected with electricity subsystem, for adding up by the infrared occupancy sensor of number and the wireless launcher for monitoring information being sent to described remote monitoring platform, also comprising the second photodiode, the second prime amplifier;
Described first photodiode and the second photodiode are separately positioned on the two ends of described cesium iodide,crystal scintillation crystal, and are coupled with cesium iodide,crystal scintillation crystal by photoconduction; First photodiode exports the first pulse signal to electricity subsystem by the first prime amplifier, and the second photodiode exports the second pulse signal to electricity subsystem by the second prime amplifier; Whether the first pulse signal and the second pulse signal are undertaken being added and detecting meeting by electricity subsystem.
Described electronic system comprises adder circuit, coincidence circuit, linear gate, amplifier, discriminator and controller; The input end of described adder circuit is connected with the output terminal of the first prime amplifier and the second prime amplifier, accept the first pulse signal and second pulse signal of the first prime amplifier and the second prime amplifier enlarge leadingly, the first pulse signal and the second pulse signal arithmetic are added the pulse signal being formed and be added; The input end of described coincidence circuit is connected with the output terminal of the first prime amplifier and the second prime amplifier, accept the first pulse signal from the first prime amplifier and the second prime amplifier enlarge leadingly and the second pulse signal, carry out meeting and form coincidence impulse and export, but because random noise spike does not conform to, coincidence circuit does not export coincidence impulse;
Described linear gate input end is connected with the output terminal of described adder circuit, another input end is connected with the output terminal of described coincidence circuit, when linear gate is triggered by the coincidence impulse that coincidence circuit exports, linear gate is opened, allow the pulse signal be added to enter amplifier by linear gate to amplify, coincidence impulse is exported, so not by linear gate because random noise spike can not trigger coincidence circuit; The input end of described discriminator is connected with linear gate output terminal, enters discriminator screen through amplifying signal, and the signal through screening enters the controller be connected with the output terminal of described discriminator and counts.
When the personnel being infected with radiomaterial by time, the ray sent causes the ANOMALOUS VARIATIONS of system counts rate, when counting rate exceedes the alarm threshold value of setting, and the infrared occupancy sensor person of having detected by time, electronic system sends alerting signal to alarm lamp.
On the basis of technique scheme, the further optimization of the present invention to technical scheme is as follows:
Described cesium iodide,crystal scintillation crystal is rectangle, and length is 100-500mm, and width is 50-300mm, and thickness is 10-50mm.
Described shield is made up of lead, cover cesium iodide,crystal scintillation crystal all the other surfaces of 5 except test surface, the radiological performance carried through the people of passage, thing is detected, and the radioactivity conductively-closed on other directions, the thickness of described shield is 3-20mm.
According to the present invention that technique scheme obtains, there is following features:
(1) adopt the non-deliquescent cesium iodide,crystal scintillation crystal of large volume as detecting element, use reliable and stable photodiode as photo-electric conversion element, have highly sensitive, volume is little, anti-magnetic interference, the advantage such as reliable and stable.
(2) only have when counting rate exceedes the alarm threshold value of setting, infrared occupancy sensor has detected that personnel pass through simultaneously, just can send alerting signal, and accurately, rate of false alarm is low in monitoring.
(3) lightweight, convenient deployment, has wireless communication function, on-the-spot emergent demand after meeting nuclear accident, nuclear leakage.
(4) one pieces of cesium iodide,crystal scintillation crystal two ends are provided with two photodiodes, and each photodiode is provided with corresponding prime amplifier, produce two pulse signals; Whether two pulse signals carries out being added and detecting meeting.Adopt pulse height adder circuit, the output pulse signal of two photodiodes is carried out arithmetic addition, the increase of sample-out count can not be caused, improve signal to noise ratio (S/N ratio), improve detection efficiency and sensitivity, reduce energy detection lower limit; Adopt coincidence circuit, restraint speckle, reduce background.
(5) adopt 5 lead shields and aluminium shell, reduce background.
Channel-type personnel radiation monitor of the present invention, adopts the non-deliquescent cesium iodide,crystal scintillation crystal of large volume as detecting element, uses reliable and stable photodiode as photo-electric conversion element.Channel-type personnel radiation monitor of the present invention is highly sensitive, monitoring accurately, little, the anti-magnetic interference of volume, reliable and stable, conveniently to dispose, there is wireless communication function, on-the-spot emergent demand after meeting nuclear accident, nuclear leakage.
Accompanying drawing explanation
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the structural representation of the probe unit of channel-type personnel radiation monitor of the present invention.
Fig. 2 is the structured flowchart of the electronic system of the probe unit of channel-type personnel radiation monitor of the present invention.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
Channel-type personnel radiation monitor provided by the invention comprise for monitor radioactive passage of being made up of two probe units staggered relatively and described passage is monitored, measurement result shows, the remote monitoring platform of data statistic analysis and Systematical control, described passage and described remote monitoring platform are by wireless mutual communication connection.
As shown in Figure 1, the probe unit of channel-type personnel radiation monitor comprises chassis 0, the housing 1 be arranged on chassis 0, arranges shield 2, cesium iodide,crystal scintillation crystal 3, first photodiode 4, first prime amplifier 5, second photodiode 6, second prime amplifier 7, electronic system 8, alarm lamp 90, infrared occupancy sensor 91 and wireless launcher 92 within the case 1.
Shield 2 is made up of lead, and cover all the other except test surface of cesium iodide,crystal scintillation crystal 35, thickness is 3-20mm, effectively can reduce background like this.Cesium iodide,crystal scintillation crystal 3 is rectangle, and length is 100-500mm, and width is 50-300mm, and thickness is 10-50mm.
First photodiode 4 and the second photodiode 6 are separately positioned on the two ends of cesium iodide,crystal scintillation crystal 3, are coupled with cesium iodide,crystal scintillation crystal 3 respectively by photoconduction.The first prime amplifier 5 is provided with after first photodiode 4, the second prime amplifier 7 is provided with after second photodiode 6, first photodiode 4 exports the first pulse signal by the first prime amplifier 5, and the second photodiode 6 exports the second pulse signal by the second prime amplifier 7.Whether the first prime amplifier 5 is connected with the signal input part of electronic system 8 respectively with the signal output part of the second prime amplifier 7, and the first pulse signal and the second pulse signal are processed by electronic system 8, carry out being added and detecting meeting.
As shown in Figure 2, electronic system 8 comprises adder circuit 81, coincidence circuit 82, linear gate 83, amplifier 84, discriminator 85 and controller 86.
The input end of adder circuit 81 is connected with the output terminal of the first prime amplifier 5 and the second prime amplifier 7, accept the first pulse signal and second pulse signal of the first prime amplifier 5 and the second prime amplifier 7 enlarge leadingly, two pulse signal arithmetic are added the pulse signal being formed and be added.
The input end of coincidence circuit 82 is connected with the output terminal of the first prime amplifier 5 and the second prime amplifier 7, accept the first pulse signal and second pulse signal of the first prime amplifier 5 and the second prime amplifier 7 enlarge leadingly, carry out meeting and form coincidence impulse and export, because random noise spike does not conform to, coincidence circuit does not export coincidence impulse.
Linear gate 83 1 input ends are connected with the output terminal of adder circuit 81, another input end is connected with the output terminal of coincidence circuit 82, when linear gate 83 is triggered by the coincidence impulse that coincidence circuit 82 exports, linear gate 83 is opened, allow the pulse signal be added to enter amplifier 84 by linear gate 83 to amplify, random noise spike can not trigger coincidence circuit 82 and export coincidence impulse, so not by linear gate 84.
The input end of discriminator 85 is connected with linear gate 83 output terminal, enters discriminator 85 screen through amplifying signal, and the signal through screening enters the controller 86 be connected with the output terminal of discriminator 85 and counts.
Whether there are personnel to pass through in infrared occupancy sensor 91 sense channel, and add up the number passed through.When infrared occupancy sensor 91 long period do not detected personnel by time, channel radioactive monitored by personnel instrument can upgrade background automatically.
The personnel being infected with radiomaterial pass through, and the ray sent can cause the ANOMALOUS VARIATIONS of system counts rate.When counting rate exceedes the alarm threshold value of setting, and infrared occupancy sensor 91 detected personnel by time, electronic system 8 sends alerting signal to alarm lamp 90.
Monitoring information (by number, polluting number, warning message etc.) is sent to described remote monitoring platform by wireless launcher 92.
Using method and the course of work of channel-type personnel radiation monitor of the present invention once are briefly described below.
(1) arrange
According to needs on the spot, the passage (probe unit) of channel-type personnel radiation monitor is arranged in appropriate position, two probe units (test surface is relative) staggered relatively, at a distance of 1.2m, remote monitoring platform is arranged in emergency center or Control Room.
(2) work
After arranging, open the switch of probe unit, remote monitoring platform runs, and channel-type personnel radiation monitor is started working.
The personnel being infected with radiomaterial pass through, when counting rate exceedes the alarm threshold value of setting, and infrared occupancy sensor 91 detected personnel by time, electronic system 8 sends alerting signal to alarm lamp 90.Alarm lamp 90 is reported to the police and is glimmered, and pipes.Meanwhile, remote monitoring platform is warning message also, carries out radioactivity warning and display.
Based on technique scheme, specific embodiment of the invention is as follows:
Embodiment 1
In the present embodiment, cesium iodide,crystal scintillation crystal 3 is of a size of 150mm × 75mm × 10mm, and the two ends of cesium iodide,crystal scintillation crystal 3 are coupled with the first photodiode 4 and the second photodiode 6 respectively by photoconduction.First photodiode 4 and the second photodiode 6 are shore pine S3590-08 photodiode.Shield 2 is positioned at other sides except test surface of cesium iodide,crystal scintillation crystal 3, thickness 3mm.
Form corresponding channel-type personnel radiation monitor according to above-mentioned design proposal, detection sensitivity is high, may detect 1.0 × 10
5bq's
137cs source, passage (two probe units) general assembly (TW) 20kg.
Embodiment 2
In the present embodiment, cesium iodide,crystal scintillation crystal 3 is of a size of 300mm × 150mm × 20mm, and the two ends of cesium iodide,crystal scintillation crystal 3 are coupled with the first photodiode 4 and the second photodiode 6 respectively by photoconduction.First photodiode 4 and the second photodiode 6 are shore pine S3204-08 photodiode.Shield 2 is positioned at other sides except test surface of cesium iodide,crystal scintillation crystal 3, thickness 5mm.
Form corresponding channel-type personnel radiation monitor according to above-mentioned design proposal, detection sensitivity is very high, may detect 2.0 × 10
4bq's
137cs source, passage (two probe units) general assembly (TW) 30kg.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (4)
1. a channel-type personnel radiation monitor, for nuclear accident, when after nuclear leakage, scene is emergent, whether testing staff is infected with radioactivity, comprise and monitoring for monitoring passage described in radioactive passage of being made up of two probe units staggered relatively and a pair, measurement result shows, the remote monitoring platform of data statistic analysis and Systematical control, described passage and described remote monitoring platform are by wireless mutual communication connection, it is characterized in that, described probe unit comprises a chassis, one to be arranged on described base plate and to have the housing of inner hollow, be arranged on the shield in described housing, cesium iodide,crystal scintillation crystal, first photodiode, first prime amplifier, electricity subsystem, the alarm lamp be connected with electricity subsystem, for adding up by the infrared occupancy sensor of number and the wireless launcher for monitoring information being sent to described remote monitoring platform, also comprise the second photodiode, second prime amplifier,
Described first photodiode and the second photodiode are separately positioned on the two ends of described cesium iodide,crystal scintillation crystal, and are coupled with cesium iodide,crystal scintillation crystal by photoconduction; First photodiode exports the first pulse signal to electricity subsystem by the first prime amplifier, and the second photodiode exports the second pulse signal to electricity subsystem by the second prime amplifier; Whether the first pulse signal and the second pulse signal are undertaken being added and detecting meeting by electricity subsystem.
Described electronic system comprises adder circuit, coincidence circuit, linear gate, amplifier, discriminator and controller; The input end of described adder circuit is connected with the output terminal of the first prime amplifier and the second prime amplifier, accept the first pulse signal and second pulse signal of the first prime amplifier and the second prime amplifier enlarge leadingly, the first pulse pulse signal and the second pulse signal arithmetic are added the pulse signal being formed and be added; The input end of described coincidence circuit is connected with the output terminal of the first prime amplifier and the second prime amplifier, accept the first pulse signal from the first prime amplifier and the second prime amplifier enlarge leadingly and the second pulse signal, carry out meeting and form coincidence impulse and export, but because random noise spike does not conform to, coincidence circuit does not export coincidence impulse;
Described linear gate input end is connected with the output terminal of described adder circuit, another input end is connected with the output terminal of described coincidence circuit, when linear gate is triggered by the coincidence impulse that coincidence circuit exports, linear gate is opened, allow the pulse signal be added to enter amplifier by linear gate to amplify, random noise spike can not trigger coincidence circuit and export coincidence impulse, so not by linear gate; The input end of described discriminator is connected with linear gate output terminal, enters discriminator screen through amplifying signal, and the signal through screening enters the controller be connected with the output terminal of described discriminator and counts.
2. channel-type personnel radiation monitor as claimed in claim 1, it is characterized in that, described cesium iodide,crystal scintillation crystal is rectangle, and length is 100-500mm, and width is 50-300mm, and thickness is 10-50mm.
3. channel-type personnel radiation monitor as claimed in claim 1, it is characterized in that, described shield is made up of lead, and cover cesium iodide,crystal scintillation crystal all the other surfaces of 5 except test surface, thickness is 3-20mm.
4. channel-type personnel radiation monitor as claimed in claim 1, it is characterized in that, only have when the radioactivity that detect exceedes the alarm threshold value of setting, and described infrared occupancy sensor detected personnel by time, described electronic system just sends alerting signal to described alarm lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310724426.7A CN104730563A (en) | 2013-12-24 | 2013-12-24 | Passage type personnel radioactivity monitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310724426.7A CN104730563A (en) | 2013-12-24 | 2013-12-24 | Passage type personnel radioactivity monitor |
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| CN104730563A true CN104730563A (en) | 2015-06-24 |
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| CN201310724426.7A Pending CN104730563A (en) | 2013-12-24 | 2013-12-24 | Passage type personnel radioactivity monitor |
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Cited By (6)
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| CN108535762A (en) * | 2018-04-21 | 2018-09-14 | 西安百衡星电子科技有限公司 | Personnel's body surface radiocontamination detecting system and detection method |
| CN110703294A (en) * | 2019-11-21 | 2020-01-17 | 黑龙江省科学院技术物理研究所 | A portable nuclear radioactive material detection system and detection method |
| CN111060952A (en) * | 2019-12-31 | 2020-04-24 | 中广核久源（成都）科技有限公司 | Quick-installation channel type vehicle radiation detection device and detection method |
| CN111856603A (en) * | 2020-07-23 | 2020-10-30 | 北京永新医疗设备有限公司 | Gate device and control method thereof |
| CN112327344A (en) * | 2020-11-25 | 2021-02-05 | 黑龙江省科学院技术物理研究所 | Monitoring terminal and measuring method for dose equivalent rate and radioactivity activity |
| CN112596109A (en) * | 2020-12-07 | 2021-04-02 | 中广核久源（成都）科技有限公司 | Personnel radioactivity and metal detection integrated device |
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