CN103163551A - Optical fiber coupled radiation detector used for slow neutron measurement - Google Patents
Optical fiber coupled radiation detector used for slow neutron measurement Download PDFInfo
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- CN103163551A CN103163551A CN2011104107428A CN201110410742A CN103163551A CN 103163551 A CN103163551 A CN 103163551A CN 2011104107428 A CN2011104107428 A CN 2011104107428A CN 201110410742 A CN201110410742 A CN 201110410742A CN 103163551 A CN103163551 A CN 103163551A
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Abstract
The invention relates to the radiometric technology and in particular to an optical fiber coupled radiation detector used for slow neutron measurement. The optical fiber coupled radiation detector used for the slow neutron measurement comprises a scintillation probe which is formed by blending of slow neutron sensitive materials and scintillating mediums, a transmission optical fiber and a photovoltaic sensitive component, wherein one end of the transmission optical fiber is inserted in the middle of the scintillation probe, the other end of the transmission optical fiber is connected with the photovoltaic sensitive component, and an optical wrapping layer of one part, arranged in the scintillation probe, of the transmission optical fiber is removed. The optical fiber coupled radiation detector used for the slow neutron measurement has the advantages of being simple in structure, small in size, strong in environment adaptability, capable of achieving on line real-time monitoring and the like, and can meet the demand of slow neutron measurement under complex and severe environment.
Description
Technical field
The present invention relates to radiometric technique, be specifically related to a kind of coupling fiber radiation detector for slow-neutron measurement.
Background technology
The neutron neutral, so detected neutron must occur to interact and the secondary charged particle that produces realizes by itself and atomic nucleus.The method that is generally used for neutron detection has nuclear reaction method, the method for nuclear recoil, nuclear fission method and core activation method.Working mechanism by detector can be divided into gas ionization detector, semiconductor detector, scintillation detector etc.That measures slow neutron has scintillation detector and semiconductor detector based on lithium reaction detector.Existing scintillation detector normally is connected scintillator with the photomultiplier transit end surfaces, the light pulse that scintillator sends is directly received by photomultiplier.Its shortcoming is that the detector volume of scintillator and photomultiplier composition is large, environmental suitability is poor.Scintillator and photomultiplier enter simultaneously Neutron Radiation Field and measure, if radiation field be hot and humid environment or have strong electromagnetic, just easily make measurement data unreliable.In addition, large because of its volume, environmental sensitivity is high, be subject in use some restrictions, be unfavorable for the neutron radiation detection under complex environment.
Summary of the invention
The object of the invention is to the defective for prior art, provide a kind of simple in structure, volume is little, environmental suitability is strong is used for the coupling fiber radiation detector of slow-neutron measurement.
Technical scheme of the present invention is as follows: a kind of coupling fiber radiation detector for slow-neutron measurement, comprise the scintillation probe, Transmission Fibers, the photoelectric sensitive device that form after being mixed by slow neutron sensitive material and scintillator, described Transmission Fibers one end inserts in the middle of scintillation probe, the other end connects photoelectric sensitive device, and the part that Transmission Fibers is placed in scintillation probe is removed fibre cladding.
Further, the coupling fiber radiation detector for slow-neutron measurement as above, wherein, described scintillation probe is by the slow neutron sensitive material
6Li and scintillator ZnS (Ag) mix in mass ratio at 1: 1; Perhaps by slow neutron sensitive material B
2O
2Mix at 1: 1 in mass ratio with scintillator ZnS (Ag).
Further, the coupling fiber radiation detector for slow-neutron measurement as above, wherein, described scintillation probe outside is provided with cylindrical aluminum hull, and the external diameter of aluminum hull is 5～7mm, and internal diameter is 3～5mm, and length is 10～15mm.
Further, the coupling fiber radiation detector for slow-neutron measurement as above, wherein, described photoelectric sensitive device is photomultiplier.
Further, the coupling fiber radiation detector for slow-neutron measurement as above, wherein, described Transmission Fibers adopts covering and core body to be all plastic optical fiber of plastic material, and the core diameter of Transmission Fibers is 0.9～1mm.
Further, the coupling fiber radiation detector for slow-neutron measurement as above, wherein, the length that described Transmission Fibers is positioned at scintillation probe is 8～13mm.
Beneficial effect of the present invention is as follows: the present invention utilizes optical fiber that scintillation probe and the photoelectric sensitive device (as photomultiplier) that slow neutron sensitive material, scintillator consist of is coupled, and forms the coupling fiber radiation detector that is used for slow-neutron measurement.It has simple in structure, the advantages such as volume is little, environmental suitability is strong, on-line real time monitoring, can satisfy the slow neutron radiation detection under complexity, rugged surroundings.
Description of drawings
Fig. 1 is the structural representation of coupling fiber radiation detector of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 1, the coupling fiber radiation detector for slow-neutron measurement provided by the present invention mainly comprises the scintillation probe 1, Transmission Fibers 2 and the photoelectric sensitive device 3 that are made of slow neutron sensitive material and scintillator.Its detection principle is: utilize slow neutron sensitive material and slow neutron to react, passage of scintillation light is sent in reaction product and scintillator effect, and passage of scintillation light is passed to photoelectric sensitive device (as photomultiplier) by Transmission Fibers, thereby obtains measuring-signal.
With slow neutron sensitive material commonly used (
6Li) be example, its detection principle is:
This reaction can be emitted the α particle of 2.05MeV, and passage of scintillation light is sent in α particle and ZnS (Ag) effect, and passage of scintillation light is passed to photomultiplier by Transmission Fibers, thereby obtains measuring-signal.
6Li be sealed in (size is about several mm) in the cylindrical aluminium container after ZnS (Ag) mixes with certain proportion, consist of the slow neutron scintillation probe; One end of Transmission Fibers inserts in the middle of scintillation probe, and insertion portion has removed the covering of optical fiber, and the other end of optical fiber connects photomultiplier.
The slow neutron sensitive material
6The blending ratio of Li and scintillator ZnS (Ag) is generally determined by the actual conditions of surveying requirement, in the present embodiment
6Li mixes in mass ratio with ZnS (Ag) at 1: 1, and potpourri is Powdered.In addition, can also select other materials, as B
2O
2Mix with ZnS (Ag), blending ratio is determined by the actual conditions of surveying requirement, also can be mixed at 1: 1 in mass ratio.
In the present embodiment, the external diameter of cylindrical aluminum hull is 5～7mm, and internal diameter is 3～5mm, and length is 10～15mm, and thickness is in the 1mm left and right.
Transmission Fibers in this example adopts radiation-resistant fiber, optical fiber is all plastic optical fiber (covering and core are plastics), the length range that optical fiber is positioned at scintillation probe is 8～13mm, length range between scintillation probe and photoelectric sensitive device can determine according to actual needs, general in the 100m scope decay of fluorescence signal less than 5%.The core diameter of optical fiber is 0.9～1mm approximately.Photomultiplier adopts the photomultiplier of single photon counting, carry out between optical fiber and photomultiplier simply docking and get final product, in order to prevent that light leak from allowing connection more firm simultaneously, also can use some web members between optical fiber and photomultiplier, the structure of web member can design according to the concrete shape of product.This detector has carried out experimental measurement in certain research reactor, confirm that its detection sensitivity is high, working stability is reliable.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technology thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1. coupling fiber radiation detector that is used for slow-neutron measurement, it is characterized in that: comprise the scintillation probe (1), Transmission Fibers (2), the photoelectric sensitive device (3) that form after being mixed by slow neutron sensitive material and scintillator, described Transmission Fibers (2) one ends insert in the middle of scintillation probe (1), the other end connects photoelectric sensitive device (3), and the part that Transmission Fibers (2) is placed in scintillation probe (1) is removed fibre cladding.
2. the coupling fiber radiation detector for slow-neutron measurement as claimed in claim 1, it is characterized in that: described scintillation probe (1) is by the slow neutron sensitive material
6Li and scintillator ZnS (Ag) mix in mass ratio at 1: 1; Perhaps by slow neutron sensitive material B
2O
2Mix at 1: 1 in mass ratio with scintillator ZnS (Ag).
3. the coupling fiber radiation detector for slow-neutron measurement as claimed in claim 1 or 2 is characterized in that: described scintillation probe (1) outside is provided with cylindrical aluminum hull, and the external diameter of aluminum hull is 5～7mm, and internal diameter is 3～5mm, and length is 10～15mm.。
4. the coupling fiber radiation detector for slow-neutron measurement as claimed in claim 1 or 2, it is characterized in that: described photoelectric sensitive device (3) is photomultiplier.
5. the coupling fiber radiation detector for slow-neutron measurement as claimed in claim 1 or 2 is characterized in that: described Transmission Fibers (2) adopts covering and core body to be all plastic optical fiber of plastic material, and the core diameter of Transmission Fibers is 0.9～1mm.
6. the coupling fiber radiation detector for slow-neutron measurement as claimed in claim 5, it is characterized in that: the length that described Transmission Fibers (2) is positioned at scintillation probe (1) is 8～13mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104107428A CN103163551A (en) | 2011-12-12 | 2011-12-12 | Optical fiber coupled radiation detector used for slow neutron measurement |
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| CN2011104107428A CN103163551A (en) | 2011-12-12 | 2011-12-12 | Optical fiber coupled radiation detector used for slow neutron measurement |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105068107A (en) * | 2015-07-17 | 2015-11-18 | 成都艾立曼科技有限公司 | Scintillating fiber sensor used for high sensitivity radiation detection |
| CN105467424A (en) * | 2014-09-10 | 2016-04-06 | 中国辐射防护研究院 | Plutonium-doped fiber and neutron measuring method thereof |
| CN105917251A (en) * | 2014-01-14 | 2016-08-31 | 住友重机械工业株式会社 | Neutron radiation detector and neutron capture therapy apparatus |
| CN106324655A (en) * | 2015-06-30 | 2017-01-11 | 中国辐射防护研究院 | Plastic scintillator doped with neutron-sensitive material uranium and method thereof for measuring thermal neutrons |
| CN108535769A (en) * | 2017-03-03 | 2018-09-14 | 中国辐射防护研究院 | A kind of probe and its test calibration method tested for optical fiber neutron detection system with calibration |
| CN111060955A (en) * | 2019-12-10 | 2020-04-24 | 中国人民解放军96901部队23分队 | Neutron energy spectrum measuring device based on multilayer neutron moderated fluorescence and optical fiber conduction |
| CN112068187A (en) * | 2020-09-03 | 2020-12-11 | 中国科学院高能物理研究所 | High-sensitivity thermal neutron detector |
| CN113687406A (en) * | 2021-09-23 | 2021-11-23 | 中国工程物理研究院激光聚变研究中心 | Pulse neutron emission time detector |
| CN115453608A (en) * | 2022-10-10 | 2022-12-09 | 哈尔滨工程大学 | Coupling enhancement type X/gamma ray optical fiber detector embedded with scintillation material |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105917251A (en) * | 2014-01-14 | 2016-08-31 | 住友重机械工业株式会社 | Neutron radiation detector and neutron capture therapy apparatus |
| CN105917251B (en) * | 2014-01-14 | 2018-11-16 | 住友重机械工业株式会社 | Neutron ray detection device and neutron-capture therapy device |
| CN105467424A (en) * | 2014-09-10 | 2016-04-06 | 中国辐射防护研究院 | Plutonium-doped fiber and neutron measuring method thereof |
| CN106324655A (en) * | 2015-06-30 | 2017-01-11 | 中国辐射防护研究院 | Plastic scintillator doped with neutron-sensitive material uranium and method thereof for measuring thermal neutrons |
| CN105068107A (en) * | 2015-07-17 | 2015-11-18 | 成都艾立曼科技有限公司 | Scintillating fiber sensor used for high sensitivity radiation detection |
| CN105068107B (en) * | 2015-07-17 | 2018-12-18 | 成都艾立本科技有限公司 | Glitter fibre optical sensor for highly sensitive detection radiation |
| CN108535769A (en) * | 2017-03-03 | 2018-09-14 | 中国辐射防护研究院 | A kind of probe and its test calibration method tested for optical fiber neutron detection system with calibration |
| CN108535769B (en) * | 2017-03-03 | 2022-06-07 | 中国辐射防护研究院 | Probe for testing and calibrating optical fiber neutron detection system and testing and calibrating method thereof |
| CN111060955A (en) * | 2019-12-10 | 2020-04-24 | 中国人民解放军96901部队23分队 | Neutron energy spectrum measuring device based on multilayer neutron moderated fluorescence and optical fiber conduction |
| CN112068187A (en) * | 2020-09-03 | 2020-12-11 | 中国科学院高能物理研究所 | High-sensitivity thermal neutron detector |
| CN113687406A (en) * | 2021-09-23 | 2021-11-23 | 中国工程物理研究院激光聚变研究中心 | Pulse neutron emission time detector |
| CN115453608A (en) * | 2022-10-10 | 2022-12-09 | 哈尔滨工程大学 | Coupling enhancement type X/gamma ray optical fiber detector embedded with scintillation material |
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Application publication date: 20130619 |