CN105467508A - Boron-doped fiber and neutron measuring method thereof - Google Patents
Boron-doped fiber and neutron measuring method thereof Download PDFInfo
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- CN105467508A CN105467508A CN201410459477.6A CN201410459477A CN105467508A CN 105467508 A CN105467508 A CN 105467508A CN 201410459477 A CN201410459477 A CN 201410459477A CN 105467508 A CN105467508 A CN 105467508A
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- boron
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Abstract
The invention relates to a boron-doped fiber and neutron measuring method thereof, and belongs to the field of radiation measurement. The boron-doped fiber is placed in the measurement environment, and connected with a photomultiplier, and the photomultiplier is connected with a signal amplification circuit; and incoming neutrons react with boron in the fiber, the reaction energy is transmitted to a fiber material and excites the fiber material, photons are released during de-excitation, the photons are transmitted to the photomultiplier via the fiber and converted into electric signals, the electric signals are amplified and recorded by the signal amplification circuit, and the amount of the incoming neutrons is measured according to the principle that the photon amount is proportional to the neutron amount.
Description
Technical field
The invention belongs to actinometry field, be specifically related to a kind of method of boron-doping optical fiber and measurement neutron thereof.
Background technology
Light transmitting fiber is called for short optical fiber, and to conduct, distance, signal attenuation are little, message capacity is widely used in the communications industry greatly.Optical fiber can not only light conducting signal, under specific condition, also can launch photon, have that structure is simple, volume is little simultaneously, lightweight, lay convenient, with low cost advantage, the therefore attention of also extremely actinometry industry.
Along with the continuous popularization of Application of Nuclear Technology, the place of neutron monitoring is needed to get more and more, when needing the regional compare of monitoring unevenness that is large or radiation field more serious, during as used traditional neutron probe formula area monitoring technology, then need the probe quantity of laying more, will the cost of whole system be made very high, use neutron optical fiber technology to complete same work and then want much cheap, meanwhile, middle sub-optical fibre can also measure the neutron irradiation in narrow region.
The primary structure of optical fiber generally can be divided into fibre core, covering, coat, jacket layer, what wherein play the effect of transmission photon is sandwich layer, its constituent material has quartz, fluoride glass, chalcogenide glass, polymethylmethacrylate (PMMA), polystyrene (PSt), fluorine-containing transparent resin or deuterate PMMA etc., the reaction cross-section of these materials and neutron is all smaller, and therefore general optical fiber can not be directly used in measurement neutron.
Summary of the invention
The object of the invention is to for problems of the prior art, a kind of boron-doping optical fiber that can be used for neutron measurement is provided, and uses the method for this optical fiber measurement neutron.
Technical scheme of the present invention is as follows: a kind of boron-doping optical fiber, comprises fibre core, covering, coat, jacket layer, and wherein, mix the raw material containing boron in the material of described fibre core, the incorporation of the raw material containing boron accounts for the 10%-15% of fibre core gross mass.
Further, boron-doping optical fiber as above, wherein, the described raw material containing boron can choose diboron trioxide, metaboric acid or borate, mixes in core material, fully mix the raw material containing boron under molten condition by corresponding proportion.
The method of above-mentioned boron-doping optical fiber measurement neutron, boron-doping optical fiber is placed in measurement environment, boron-doping optical fiber is connected with photomultiplier, photomultiplier connection signal amplifying circuit and pulse recording circuit, boron in incident neutron and optical fiber reacts, reaction can pass to fiber optic materials makes it excite, photon is released during de excitation, photon through Optical Fiber Transmission to photomultiplier, to be amplified by signal amplification circuit after converting electric impulse signal to and by pulse recording circuit record, the quantity of electric pulse is the number of times being proportional to neutron and boron generation nuclear reaction, also incident neutron quantity is just proportional to, the electric impulse signal amount of record unit time can calculate the fluence of neutron, realize the measurement of neutron fluence.
Beneficial effect of the present invention is as follows: neutron sensitive material boron mixes in the core material of optical fiber by the present invention, and the material of boracic effectively can measure neutron.The method of this employing optical fiber measurement neutron is cheap, and applied range can measure the neutron irradiation of narrow zone easily.
Accompanying drawing explanation
Fig. 1 is the principle schematic of boron-doping optical fiber measurement neutron.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Neutron can with a lot of material generation nuclear reaction, after mixing a certain proportion of neutron sensitive material in optical fiber, incident neutron and its reaction, reaction can pass to fiber optic materials makes it excite, photon is released during de excitation, photon through Optical Fiber Transmission to photomultiplier, convert to electric signal and amplify after by subsequent conditioning circuit record.The energy that photon numbers absorbs to material is directly proportional, and the reaction of nuclear reaction can be certain, and photon numbers is also just proportional to number of neutrons.
10there is n+ in B and neutron
10b=α+
7the nuclear reaction of Li+2.792Mev,
10the reaction cross-section of B and neutron is higher, and the cross section of thermal neutron is 3840 targets, therefore contains
10the material of B effectively can measure neutron, and method mixes a certain proportion of boron material, and concrete mixed ratio can be determined by experiment.Material containing boron can choose in diboron trioxide, metaboric acid or borate any one, or also can consider to adopt two or more composite materials.
The present invention mixes boron by the fibre core of optical fiber, utilizes the material containing boron effectively can measure neutron.The α particle that above-mentioned nuclear reaction generates can by energy loss in fiber optic materials, core material is made to be in excited state, photon will inevitably be released during de excitation, photon numbers is proportional to the energy of loss, the i.e. quantity of fission reaction, also incident neutron number is just proportional to, thus the measurement of the neutron fluence realized, be multiplied by fluence-dose conversion coefficient and can obtain the Radiation Protection Quantities such as neutron DE.
Ratio, the photomultiplier model of the number of pulses that neutron is finally formed and boron-doping are relevant with photomultiplier duty, when boron-doping ratio-dependent, photomultiplier model are determined to complete with photomultiplier circuit design, can obtain by the method that the method analog computation of Monte Carlo is also verified by experiment.
Boron is mixed in core material, weakening of core light transmissibility will inevitably be caused, but the object of the invention is neutron measurement, general application scenario can not be greater than the length of tens of meters, less demanding to the light transmissibility of optical fiber, as long as therefore the ratio of boron is controlled just can meet request for utilization in the reasonable scope.
The incorporation of the raw material containing boron accounts for the 10%-15% of fibre core gross mass, and this concentration range both can ensure that in optical fiber measurement, the period of the day from 11 p.m. to 1 a.m had good detection efficiency, and optical fiber also can be made to also have certain light conductive performance.First by the optical fiber of the different boron-doping ratio of small-scale production, as B in core material
2o
3content is 10%, 11% ..., 15%, through experiment choose the highest boron-doping ratio of detection efficiency as the optimal proportion produced from now on.
Embodiment
Boron-doping optical fiber comprises fibre core, covering, coat, jacket layer, and concrete preparation method is by B
2o
3raw material (the mainly SiO producing preform is incorporated into by corresponding proportion
2) in, be heated to molten condition, fully make preform after mixing, the production technologies such as follow-up polishing, wire drawing, coating are identical with the production technology of general optical fiber with flow process.
As shown in Figure 1, the method of above-mentioned boron-doping optical fiber measurement neutron, boron-doping optical fiber is placed in measurement environment, boron-doping optical fiber is connected with photomultiplier, photomultiplier connection signal amplifying circuit and pulse recording circuit, boron in incident neutron and optical fiber reacts, reaction can pass to fiber optic materials makes it excite, photon is released during de excitation, photon through Optical Fiber Transmission to photomultiplier, amplified and record by signal amplification circuit after converting electric impulse signal to, and the quantity of this electric pulse is the number of times being proportional to neutron and boron generation nuclear reaction, also incident neutron quantity is just proportional to, the electric impulse signal amount of record unit time can calculate the fluence of neutron, realize the measurement of neutron fluence.Ratio, the photomultiplier model of the number of pulses that neutron is finally formed and boron-doping are relevant with photomultiplier duty, when boron-doping ratio-dependent, photomultiplier model are determined to complete with photomultiplier circuit design, can obtain by the method that the method analog computation of Monte Carlo is also verified by experiment.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technology thereof, then the present invention is also intended to comprise these change and modification.
Claims (3)
1. a boron-doping optical fiber, comprises fibre core, covering, coat, jacket layer, it is characterized in that: in the material of described fibre core, mix the raw material containing boron, and the incorporation of the raw material containing boron accounts for the 10%-15% of fibre core gross mass.
2. boron-doping optical fiber as claimed in claim 1, is characterized in that: the described raw material containing boron can choose diboron trioxide, metaboric acid or borate, mixes in core material, fully mix the raw material containing boron under molten condition by corresponding proportion.
3. adopt the method for boron-doping optical fiber measurement neutron described in claim 1 or 2, it is characterized in that: boron-doping optical fiber is placed in measurement environment, boron-doping optical fiber is connected with photomultiplier, photomultiplier connection signal amplifying circuit and pulse recording circuit, boron in incident neutron and optical fiber reacts, reaction can pass to fiber optic materials makes it excite, photon is released during de excitation, photon through Optical Fiber Transmission to photomultiplier, to be amplified by signal amplification circuit after converting electric impulse signal to and by pulse recording circuit record, the quantity of electric pulse is the number of times being proportional to neutron and boron generation nuclear reaction, also incident neutron quantity is just proportional to, the electric impulse signal amount of record unit time can calculate the fluence of neutron, realize the measurement of neutron fluence.
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| CN201410459477.6A CN105467508A (en) | 2014-09-10 | 2014-09-10 | Boron-doped fiber and neutron measuring method thereof |
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| CN201410459477.6A CN105467508A (en) | 2014-09-10 | 2014-09-10 | Boron-doped fiber and neutron measuring method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398709A (en) * | 2017-02-08 | 2018-08-14 | 中国辐射防护研究院 | A kind of optical fiber radiation probe |
Citations (3)
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| WO2003094205A2 (en) * | 2002-05-03 | 2003-11-13 | Nova Scientific, Inc. | Electron multipliers and radiation detectors |
| US20100111487A1 (en) * | 2008-10-31 | 2010-05-06 | Bruce Gardiner Aitken | Phosphate Glasses Suitable for Neutron Detection and Fibers Utilizing Such Glasses |
| US8258483B1 (en) * | 2011-05-05 | 2012-09-04 | Ut-Battelle, Llc | High spatial resolution particle detectors |
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2014
- 2014-09-10 CN CN201410459477.6A patent/CN105467508A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003094205A2 (en) * | 2002-05-03 | 2003-11-13 | Nova Scientific, Inc. | Electron multipliers and radiation detectors |
| US20100111487A1 (en) * | 2008-10-31 | 2010-05-06 | Bruce Gardiner Aitken | Phosphate Glasses Suitable for Neutron Detection and Fibers Utilizing Such Glasses |
| US8258483B1 (en) * | 2011-05-05 | 2012-09-04 | Ut-Battelle, Llc | High spatial resolution particle detectors |
Non-Patent Citations (3)
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| MICHAEL F. L"ANNUNZIATA: "《放射性分析手册》", 31 December 2006, 原子能出版社 * |
| 严锦生: "《非电量电测技术 下册：核辐射技术在检测中的应用》", 30 December 1997 * |
| 陈宏芳: "《粒子探测技术》", 30 June 2009 * |
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|---|---|---|---|---|
| CN108398709A (en) * | 2017-02-08 | 2018-08-14 | 中国辐射防护研究院 | A kind of optical fiber radiation probe |
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