CN106324657B - The method adulterated the plastic scintillant of neutron-sensitive substance lithium and its measure thermal neutron - Google Patents
The method adulterated the plastic scintillant of neutron-sensitive substance lithium and its measure thermal neutron Download PDFInfo
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- CN106324657B CN106324657B CN201510387295.7A CN201510387295A CN106324657B CN 106324657 B CN106324657 B CN 106324657B CN 201510387295 A CN201510387295 A CN 201510387295A CN 106324657 B CN106324657 B CN 106324657B
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- neutron
- lithium
- plastic scintillant
- fluence
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 49
- 239000004033 plastic Substances 0.000 title claims abstract description 47
- 229920003023 plastic Polymers 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000126 substance Substances 0.000 title claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 230000005284 excitation Effects 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 claims abstract description 11
- 239000004793 Polystyrene Substances 0.000 claims description 9
- 229920002223 polystyrene Polymers 0.000 claims description 9
- LBDSXVIYZYSRII-IGMARMGPSA-N alpha-particle Chemical compound [4He+2] LBDSXVIYZYSRII-IGMARMGPSA-N 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 7
- 238000010348 incorporation Methods 0.000 claims description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 230000005622 photoelectricity Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 5
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 229910001947 lithium oxide Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- 239000006259 organic additive Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- Measurement Of Radiation (AREA)
Abstract
The invention belongs to actinometry fields, and in particular to a method of the plastic scintillant and its measurement thermal neutron of doping neutron-sensitive substance lithium.The present invention mixes the raw material containing lithium in plastic scintillant, will mix lithium plastic scintillant and connect with photomultiplier tube, and is sealed in opaque shell, forms probe；Probe is placed in measurement environment, nuclear reaction occurs for the raw material containing lithium in incident neutron and plastic scintillant, material is set to be in excitation state, photon is released when de excitation, photon numbers are proportional to incident neutron number, the fluence of neutron can be calculated by recording electric impulse signal amount of the photomultiplier tube in the unit time, to realize the measurement of neutron fluence, neutron DE can be obtained multiplied by fluence-dose conversion coefficient.The present invention is cheap, has a wide range of application, and detection efficient is high.
Description
Technical field
The invention belongs to actinometry fields, and in particular to it is a kind of adulterate neutron-sensitive substance lithium plastic scintillant and its
The method for measuring thermal neutron.
Background technique
Plastic scintillant generally does matrix by polystyrene, is blended into other organic additives and makees scitillating material, along with shifting
Wave agent is made, it has, and detection efficient is high, photoyield is high, and signal pulse width is narrow, and processability is good, adaptive capacity to environment
By force, stable mechanical performance, it is low in cost the advantages that and be widely used in actinometry work, but due to the master of plastic scintillant
Wanting ingredient is C, H, O, they are lower with the section of neutron interaction, generally cannot be directly used to the monitoring field of neutron, is
This, the period of the day from 11 p.m. to 1 a.m needs to adulterate or be embedded in other materials also to increase optical signal output in detection, is such as embedded in one layer in plastic scintillant
ZnS:Ag film just can be used for fast neutron measurement.
Since ZnS:Ag film is opaque, the method that ZnS:Ag film is embedded in plastic scintillant can lose many light
Son causes detection efficient and sensitivity to decline.
Summary of the invention
It is an object of the invention to aiming at the problems existing in the prior art, provide it is a kind of can be used for thermal neutron measurement mix
The plastic scintillant of miscellaneous neutron-sensitive substance lithium, and use this method for mixing lithium Plastic scintillation bulk measurement thermal neutron.
Technical scheme is as follows: a kind of plastic scintillant adulterating neutron-sensitive substance lithium is made by polystyrene
Matrix is blended into scitillating material and Wavelength shifter, wherein mixes the raw material containing lithium in the polystyrene substrate, contains lithium
The incorporation of raw material accounts for the 7%-12% of plastic scintillant gross mass.
Further, the plastic scintillant of neutron-sensitive substance lithium is adulterated as described above, wherein the original containing lithium
Material includes lithia, the salt containing lithium, during preparing plastic scintillant, the raw material containing lithium is poly- by corresponding proportion incorporation
It is sufficiently mixed in styrene matrix.
The method of the Plastic scintillation bulk measurement thermal neutron of above-mentioned doping neutron-sensitive substance lithium, will mix lithium plastic scintillant with
Photomultiplier tube connection, and be sealed in opaque shell, form probe；Probe is placed in measurement environment, incident neutron
Nuclear reaction occurs with the raw material containing lithium in plastic scintillant, whole energy losses are being mixed lithium by the α particle that nuclear reaction is released
In plastic scintillant, material is made to be in excitation state, when de excitation releases photon, and photon numbers are proportional to the energy of α particle loss, i.e.,
The quantity of nuclear reaction is also just proportional to incident neutron number, electric impulse signal amount of the record photomultiplier tube in the unit time
The fluence of neutron is calculated, to realize the measurement of neutron fluence, neutron dose can be obtained multiplied by fluence-dose conversion coefficient and work as
Amount.
Beneficial effects of the present invention are as follows: the present invention mixes neutron sensitive material lithium in plastic scintillant, the material containing lithium
Material can effectively measure neutron.It is this cheap using the method for mixing lithium Plastic scintillation bulk measurement thermal neutron, application range
Extensively, detection efficient is much higher than the method for being embedded in ZnS:Ag film in plastic scintillant.
Detailed description of the invention
Fig. 1 is to mix lithium plastic scintillant structure and nuclear reaction schematic diagram；
Fig. 2 is the schematic diagram of plastic scintillator detector.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
The chief component of scintillator detector has scintillator, collection optical system, photoelectric device (such as light for detecting light
Electric multiplier tube), and to the divider that each electrode of photomultiplier tube is powered, they are closed in an opaque shell,
It is referred to as probe, this belongs to the known features of this field.Wherein the primary structure of plastic scintillant generally does matrix by polystyrene,
It is blended into other organic additives and makees scitillating material, along with Wavelength shifter is made, these materials are not sent out substantially containing C, H, O and thermal neutron
Raw effect, therefore general plastic scintillant cannot be directly used to measurement thermal neutron.
With many substances nuclear reaction can occur for neutron, and a certain proportion of neutron sensitive material will be embedded in plastic scintillant
Afterwards, incident neutron reacts with it, and reaction, which can pass to plastic scintillant material, makes its excitation, and when de excitation releases photon, photon warp
Wavelength shifter is transferred to photomultiplier tube, is converted into electric signal and is recorded after amplifying by subsequent conditioning circuit.Photon numbers and material absorb
Energy it is directly proportional, and the reaction of nuclear reaction can be certain, and photon numbers are also just proportional to number of neutrons.
As shown in Figure 1,6N+ occurs for Li and neutron6Li=α+3The nuclear reaction of H+4.8Mev,6The reaction cross-section of Li and neutron
Higher and thermal neutron section is 910 targets, therefore is contained6The material of Li can effectively measure neutron, and method is to prepare former plastics
While scintillator, the particle containing lithium is added.The present invention mixes the original containing lithium in the polystyrene substrate of plastic scintillant
Material, the incorporation of the raw material containing lithium account for the 7%-12% of plastic scintillant gross mass.The raw material containing lithium can be chosen
Lithia, the salt containing lithium, such as lithium chloride etc., by the raw material containing lithium by sufficiently mixed in corresponding proportion incorporation polystyrene substrate
It closes.
It connect, is then connect again with photomultiplier tube, and sealed with light guide 2 as shown in Fig. 2, lithium plastic scintillant 1 will be mixed
It in opaque shell, is formed and is popped one's head in, in figure, K is photocathode, and F is focusing electrode, D1~D10For dynode, A is anode.It will
Probe is placed in measurement environment, and nuclear reaction occurs for the raw material containing lithium in incident neutron and plastic scintillant, due to α particle
Extremely short range, the α particle that nuclear reaction is released can make material be in excitation state, move back by whole energy losses in plastic scintillant
Photon will necessarily be released when sharp, photon numbers are proportional to the energy of α particle loss, the i.e. quantity of nuclear reaction, be also just proportional into
Subnumber is hit, to realize the measurement of neutron fluence, the radiation such as neutron DE can be obtained multiplied by fluence-dose conversion coefficient
Protection amount.
Embodiment
It mixes lithium plastic scintillant and matrix is made by the polystyrene for mixing the raw material containing lithium, be blended into scitillating material and Wavelength shifter
It forms, specific preparation method is to make matrix with the polystyrene of the lithia containing corresponding proportion the first solute is added to three first
Polymerization, which is made, after benzene and the second solute PoPo mixes lithium plastic scintillant block, then mixes lithium plastic scintillant through excision forming acquisition.
As shown in Figure 1, being incident on the reaction mixed and occurred in lithium plastic scintillant by neutron；To mix lithium plastic scintillant with
Collection optical system, the photoelectric device (such as photomultiplier tube) for detecting light, and to the partial pressure that each electrode of photomultiplier tube is powered
Device is enclosed in an opaque shell, forms probe, and probe internal structure is as shown in Figure 2.Probe is placed in measurement environment
In, incident neutron reacts with the lithium mixed in lithium plastic scintillant, and reaction, which can pass to the first solute, makes it to three ditolyls
Excitation, the fluorescence of launch wavelength 350-400nm, the second solute PoPo absorb the fluorescence emission wavelengths longer light when de excitation,
Main peak position wavelength is transferred to photomultiplier tube through light guide in 423nm, photon, is converted into after electric impulse signal by signal amplification circuit
Amplify and record, and the quantity of this electric pulse is proportional to the number that nuclear reaction occurs for neutron and lithium, be also just proportional into
Number of neutrons is penetrated, the electric impulse signal amount of record unit time can calculate the fluence of neutron, realize the measurement of neutron fluence.
One finally formed number of pulses of neutron has with the ratio, photomultiplier tube model and photomultiplier tube working condition for mixing lithium
It closes, it, can be special with covering in the case where mixing determining lithium ratio-dependent, photomultiplier tube model and the completion of photomultiplier tube circuit design
The method simulation of Caro is calculated and is obtained by the method for experimental verification.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technology
Within, then the present invention is also intended to include these modifications and variations.
Claims (1)
1. a kind of method for the Plastic scintillation bulk measurement thermal neutron for adulterating neutron-sensitive substance lithium, the plastic scintillant is by gathering
Styrene makees matrix, is blended into scitillating material and Wavelength shifter, and the raw material containing lithium is mixed in the polystyrene substrate, contains lithium
The incorporation of raw material account for the 7%-12% of plastic scintillant gross mass, it is characterised in that: lithium plastic scintillant and photoelectricity will be mixed
Multiplier tube connection, and be sealed in opaque shell, form probe；Probe is placed in measurement environment, incident neutron and modeling
Expect that nuclear reaction occurs for the raw material containing lithium in scintillator, whole energy losses are being mixed lithium plastics by the α particle that nuclear reaction is released
In scintillator, material is made to be in excitation state, when de excitation releases photon, and photon numbers are proportional to the energy of α particle loss, i.e. core is anti-
The quantity answered also just is proportional to incident neutron number, and recording electric impulse signal amount of the photomultiplier tube in the unit time can calculate
Neutron DE can be obtained multiplied by fluence-dose conversion coefficient to realize the measurement of neutron fluence in the fluence of neutron out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510387295.7A CN106324657B (en) | 2015-06-30 | 2015-06-30 | The method adulterated the plastic scintillant of neutron-sensitive substance lithium and its measure thermal neutron |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510387295.7A CN106324657B (en) | 2015-06-30 | 2015-06-30 | The method adulterated the plastic scintillant of neutron-sensitive substance lithium and its measure thermal neutron |
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| Publication Number | Publication Date |
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| CN106324657A CN106324657A (en) | 2017-01-11 |
| CN106324657B true CN106324657B (en) | 2019-04-23 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109143317B (en) * | 2017-06-16 | 2023-05-16 | 中国辐射防护研究院 | Neutron detection method and equipment for reducing gamma ray interference by using CsI scintillator |
| CN109143316B (en) * | 2017-06-16 | 2023-09-15 | 中国辐射防护研究院 | Neutron detection method and equipment for reducing gamma-ray interference by utilizing NaI (TI) scintillator |
| CN108152851B (en) * | 2017-11-27 | 2020-11-20 | 中核控制系统工程有限公司 | Fast and slow neutron composite detector |
| CN109613603B (en) * | 2018-12-25 | 2023-10-20 | 中国辐射防护研究院 | Method for measuring neutrons by using rubidium-doped glass |
| CN114721030B (en) * | 2022-05-05 | 2023-04-18 | 四川大学 | Preparation method of wave-shifting optical fiber |
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| US20120112074A1 (en) * | 2010-11-08 | 2012-05-10 | General Electric Company | Neutron scintillator composite material and method of making same |
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| CN86108715A (en) * | 1985-12-23 | 1987-08-26 | 施卢默格海外有限公司 | Logging method and devices such as gamma-ray spectroscopy |
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| CN101128731A (en) * | 2004-10-05 | 2008-02-20 | 澳联邦科学与工业研究组织 | radiographic equipment |
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| CN106324657A (en) | 2017-01-11 |
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