CN1087426A - Detecting system for explosive material - Google Patents
Detecting system for explosive material Download PDFInfo
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- CN1087426A CN1087426A CN 92101973 CN92101973A CN1087426A CN 1087426 A CN1087426 A CN 1087426A CN 92101973 CN92101973 CN 92101973 CN 92101973 A CN92101973 A CN 92101973A CN 1087426 A CN1087426 A CN 1087426A
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- Prior art keywords
- fast
- neutron
- explosive
- detecting system
- detector
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- 239000002360 explosive Substances 0.000 title claims abstract description 39
- 239000000463 material Substances 0.000 title claims description 10
- 239000002245 particle Substances 0.000 claims abstract description 13
- 229910016036 BaF 2 Inorganic materials 0.000 claims description 5
- 239000013307 optical fiber Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 13
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 230000005251 gamma ray Effects 0.000 abstract description 2
- 238000012856 packing Methods 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 32
- 229910052757 nitrogen Inorganic materials 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 229910052799 carbon Inorganic materials 0.000 description 12
- LBDSXVIYZYSRII-IGMARMGPSA-N alpha-particle Chemical compound [4He+2] LBDSXVIYZYSRII-IGMARMGPSA-N 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 238000001228 spectrum Methods 0.000 description 6
- 125000004430 oxygen atom Chemical group O* 0.000 description 5
- 229910052722 tritium Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910052805 deuterium Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- -1 deuterium ion Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 230000001818 nuclear effect Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
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- Analysing Materials By The Use Of Radiation (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention provides a kind of high-space resolution fast neutron explosive detection system, comprise neutron generator, fast alpha particle position sensitive detector and one group of gamma ray detector and data are obtained, processing, control computer.Utilize explosive detection of the present invention to detect the accuracy rate height, be not subjected to the influence of various pseudo-packings, the detection sensitivity height, the time is short.
Description
The present invention relates to fast neutron explosive detection field.
Up to now, the explosive detection method has the X light analysis method, the object space method of labelling in gas composition analysis method and the explosive and thermal neutron analysis method etc., and still, these methods all exist significant limitation.More and more deceitful in the means of terrorist's criminal activity, used technology is the appearance of advanced today, particularly plastic explosive more and more, because its density and common many article are close, does not have betal can again, and the X light analysis method will be run into unsurmountable difficulty; The low volatility explosive, the gas composition analysis method is also with malfunctioning after tight encapsulation; That is developing adds label in explosive, thereby improve the method for detection sensitivity, also be that significant limitation is arranged, can the existing a large amount of unmarked explosive in one side various countries all be destroyed is a serious problems, will never add label when the terrorist makes explosive by oneself on the other hand.The thermal neutron analysis technology can be measured the content of nitrogen in the determinand effectively, the characteristics that are higher than general article again according to nitrogen content in the explosive, determine the existence of explosive, but many article are also arranged (for example, silk, woolen knitwear, melamine goods, nylon etc.) nitrogen content and explosive similar, make the thermal neutron analysis method produce serious flase drop like this.
Purpose of the present invention just is the deficiency at above-mentioned prior art, proposes a kind of fast neutron explosive detection system of high spatial explanation, and the existence of explosive detection and position thereof avoid all pseudo-packings, and detection speed are very fast effectively.
Realize this purpose, following requirement should be arranged the explosive detection technology:
(1) can measure the content of multiple elements such as nitrogen in the explosive, carbon, oxygen simultaneously, rather than the content of a kind of element (as nitrogen), and nitrogen, carbon, oxygen in explosive corresponding content and the corresponding content and the ratio of the above-mentioned element of ratio and other article be visibly different, thereby improve the accuracy that detects greatly, reduce false drop rate.
(2) be not subjected to the influence of the various camouflages of explosive.
(3) very high spatial resolution will be arranged, even be placed with carbon containing or oxygen near explosive, or during the very high article of nitrogen, explosive also can be detected.
To achieve these goals, the invention provides the high-space resolution fast neutron and detect flare system, the ultimate principle of native system utilization is: by deuterium-tritium reaction (d+T →
4When He+n) energy that the is produced atomic nucleus that is about the fast neutron of 14Mev and the nitrogen in the explosive, carbon, oxygen interacts, with the feature gamma-rays that produces separately, by measuring the gamma-ray power spectrum of these features, determine the content and the ratio thereof of nitrogen, carbon, oxygen, thereby judge whether explosive exists; The α particle of in deuterium-tritium reaction, following neutron and producing (
4He nuclear) being simultaneously in time with neutron, spatially is one to one.The neutron time of flight spectral method of α particle is followed in employing, promptly measures the gamma-rays of α particle and neutron and nitrogen, carbon, oxygen atom nuclear effect generation simultaneously, and determines the time relationship between them; The volume coordinate that nitrogen, carbon, oxygen atom nuclear phase in neutron and the explosive should act on be can determine by α particle position and corresponding time response, thereby the position and the profile of explosive obtained.
A kind of detecting system for explosive material is characterized in that, this system comprises, the robot calculator that neutron generator, the fast alpha particle position sensitive detector that is mated, gamma detector, the data that link to each other with said apparatus are obtained, handled and control.
Said neutron generator can be Cockcroft-Walton accelerator or neutron tube.
Fast alpha particle position sensitive detector is to be made of a plurality of fast alpha particle detector arrays.
Gamma detector, available BaF
2Scintillation spectrometer.
Utilize the present invention, because fast neutron has extremely strong penetration capacity, it will penetrate any wrapper that can realize, atomic nucleus direct and determinand interacts, α particle neutron time of flight spectral technology is followed in employing, make the present invention realize quite high spatial discrimination ability, used neutron generator yield is very high, therefore, native system can effectively and fast be measured the explosive in the article to be measured, for example, the spatial discrimination ability is better than 8cm * 8cm * 5cm, detection sensitivity is 200 grams for the TNT explosive, detects article to be measured (as a suitcase) time and is about 6 seconds.
The simple declaration of accompanying drawing:
Fig. 1 detecting system for explosive material synoptic diagram
Fig. 2 embodiment of the invention synoptic diagram
Symbol description:
1 fast-neutron generator and fast alpha particle position sensitive detector
2 inspected object
3 explosives
4 gamma detectors
5 ion guns and accelerating electrode
6 deuterium bundles
7 tritium targets
8 α particles
9 fast alpha particle position sensitive detectors
10 fast neutrons
11 gamma-rays
Electronic computer system is obtained, handles and controlled to 12 data
Introduce one embodiment of the present of invention below:
The fast-neutron generator part can be selected the neutron tube of being furnished with fast alpha particle position sensitive detector for use.It constitutes (Fig. 2) by parts such as ion gun, tritium target, α scintillation screens.By the deuterium ion that ion gun produces, be accelerated to about 150Kev after, bombard tritium target (target spot≤3mm * 4mm), carry out T(d, n)
4He reaction produces fast neutron and α particle, and the requirement of fast neutron yield reaches～and 5 * 10
8Second, the α particle is by α scintillation screen record, and the α scintillation screen adopts ZnO(Ga), its fluorescent lifetime constant is 1.5ns, can be high temperature resistant.The α particle fluorescence that the diverse location place produces on the α scintillation screen, derive by optical fiber, be coupling in respectively on the different photomultipliers, export two signals from photomultiplier: one is position signalling, be used for determining carbon in fast neutron and the sample (as suitcase), the coordinate of nitrogen, oxygen atom nuclear interaction point (being made as x, y); Another is a time signal, is used as the termination signal of neutron time of flight spectrum.
By the fast neutron that neutron tube produces, after certain distance (for example about 1 meter) flight, the irradiation sample with carbon, nitrogen wherein, oxygen atom nuclear interaction, produces feature gamma-rays separately, that have definite energy.These gamma-rays are by the gamma detector record.Gamma detector is by BaF
2Crystal, parts such as fast response photomultiplier are formed, and this photomultiplier will be exported two signals: one is used for judging the existence of carbon, nitrogen, oxygen for energy signal, and determines its content and ratio; Another is a time signal, is used as the start signal of neutron time of flight spectrum.The time signal that this time signal and alpha detection device provide is successively imported time-of-flight spectrometer, can provide the neutron time of flight spectrum, can provide the distance that neutron upward flies in exit direction (being made as the Z axle) according to neutron time of flight and energy thereof, thereby determine 2 coordinates of carbon, nitrogen, oxygen and neutron application point in the sample.
In order to suppress the interference of spuious gamma-rays and neutron, except adopting the material shielding, also utilize the record of the signal controlling gamma spectrum data that above-mentioned time-of-flight spectrometer provides, promptly have only the α particle of those and alpha detection device record to have the gamma-rays that fast neutron produced of definite time relationship just to go on record.
In the present embodiment, the coordinate of carbon, nitrogen, oxygen atom nuclear is determined jointly by alpha position sensitive detector (determining x, y) and neutron time-of-flight spectrometer (determining z) in the sample; And the content of these elements and ratio thereof, then by analyzing BaF
2The feature gamma spectrum that detector is measured obtains.With these data of Computer Analysis, and with the corresponding data of various explosives relatively, can determine whether there is explosive in the sample, and provide their locus and profile, on display, show, provide warning simultaneously.
Claims (5)
1, a kind of detecting system for explosive material is characterized in that, the fast alpha particle position sensitive detector that this system comprises fast-neutron generator and is mated, and robot calculator is obtained, handles and controlled to gamma detector and the data that link to each other with said apparatus.
2, the detecting system for explosive material of putting down in writing according to claim 1 is characterized in that, said fast-neutron generator and fast alpha particle position sensitive detector constitute one.
3, according to claim 1,2 detecting system for explosive material of being put down in writing, it is characterized in that, said fast alpha particle position sensitive detector is the array that is made of a plurality of fast alpha particle detectors, and each alpha particle detector is to be made of ZnO scintillator, optical fiber and photomultiplier.
4, according to the detecting system for explosive material of claim 1,2 records, it is characterized in that said gamma detector is by BaF
2Scintillator and fast response photomultiplier constitute.
5, according to the detecting system for explosive material of claim 3 record, it is characterized in that gamma detector wherein is by BaF
2Scintillator and fast response photomultiplier constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92101973A CN1034884C (en) | 1992-03-26 | 1992-03-26 | Detecting system for explosive material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92101973A CN1034884C (en) | 1992-03-26 | 1992-03-26 | Detecting system for explosive material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1087426A true CN1087426A (en) | 1994-06-01 |
| CN1034884C CN1034884C (en) | 1997-05-14 |
Family
ID=4939406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92101973A Expired - Fee Related CN1034884C (en) | 1992-03-26 | 1992-03-26 | Detecting system for explosive material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1034884C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995015A (en) * | 2014-04-22 | 2014-08-20 | 中国工程物理研究院核物理与化学研究所 | Explosive detection device |
| CN105954320A (en) * | 2016-06-17 | 2016-09-21 | 中国工程物理研究院流体物理研究所 | Device for studying shock initiation performance of explosive and experiment method of device |
| CN109632837A (en) * | 2018-12-28 | 2019-04-16 | 中国原子能科学研究院 | The automatic time scaling method of associated particle neutron detection |
| CN110044940A (en) * | 2019-03-19 | 2019-07-23 | 兰州大学 | A kind of deuterium deuterium neutron is with three particle imaging device of helium |
| CN111458758A (en) * | 2019-12-27 | 2020-07-28 | 中国原子能科学研究院 | Detection device for underwater suspected explosion source |
| CN113281354A (en) * | 2021-04-13 | 2021-08-20 | 中科超睿(青岛)技术有限公司 | Dangerous article detection device and method based on neutrons and X rays |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4756866A (en) * | 1985-10-09 | 1988-07-12 | Alvarez Luis W | Nitrogen detection |
| FR2588969B1 (en) * | 1985-10-18 | 1988-02-26 | Commissariat Energie Atomique | DEVICE FOR DETECTION OF EXPLOSIVE EXAMPLES |
| US5278418A (en) * | 1990-03-13 | 1994-01-11 | Broadhurst John H | Luggage explosive detector |
| US5200626A (en) * | 1990-03-28 | 1993-04-06 | Martin Marietta Energy Systems, Inc. | Hidden explosives detector employing pulsed neutron and x-ray interrogation |
| US5251240A (en) * | 1990-05-04 | 1993-10-05 | Massachusetts Institute Of Technology | Method and apparatus for employing resonance-produced gamma rays to detect the presence of both nitrogen and oxygen in objects that may contain explosives |
| EP0485872A3 (en) * | 1990-11-16 | 1993-01-27 | Messerschmitt-Boelkow-Blohm Gmbh | Detector for nitrogen-, phosphor-, chlorine-, and/or oxygen-containing substances |
| CN1029706C (en) * | 1990-11-30 | 1995-09-06 | 中国原子能科学研究院 | Method and apparatus for testing explosives |
-
1992
- 1992-03-26 CN CN92101973A patent/CN1034884C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995015A (en) * | 2014-04-22 | 2014-08-20 | 中国工程物理研究院核物理与化学研究所 | Explosive detection device |
| CN105954320A (en) * | 2016-06-17 | 2016-09-21 | 中国工程物理研究院流体物理研究所 | Device for studying shock initiation performance of explosive and experiment method of device |
| CN105954320B (en) * | 2016-06-17 | 2019-08-30 | 中国工程物理研究院流体物理研究所 | A kind of device and its experimental method for studying explosive Impact Initiation performance |
| CN109632837A (en) * | 2018-12-28 | 2019-04-16 | 中国原子能科学研究院 | The automatic time scaling method of associated particle neutron detection |
| CN110044940A (en) * | 2019-03-19 | 2019-07-23 | 兰州大学 | A kind of deuterium deuterium neutron is with three particle imaging device of helium |
| CN111458758A (en) * | 2019-12-27 | 2020-07-28 | 中国原子能科学研究院 | Detection device for underwater suspected explosion source |
| CN113281354A (en) * | 2021-04-13 | 2021-08-20 | 中科超睿(青岛)技术有限公司 | Dangerous article detection device and method based on neutrons and X rays |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1034884C (en) | 1997-05-14 |
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