CN106597521A - Fast neutron detector resisting interference of strong gamma rays and application method thereof - Google Patents
Fast neutron detector resisting interference of strong gamma rays and application method thereof Download PDFInfo
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- CN106597521A CN106597521A CN201611235427.5A CN201611235427A CN106597521A CN 106597521 A CN106597521 A CN 106597521A CN 201611235427 A CN201611235427 A CN 201611235427A CN 106597521 A CN106597521 A CN 106597521A
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- circular
- cavity
- fast neutron
- liquid scintillator
- gating circuit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
- G01T3/02—Measuring neutron radiation by shielding other radiation
Abstract
The invention discloses a fast neutron detector resisting interference of strong gamma rays, comprising a piece of circular quartz glass, a visible light shielding cover, a micro channel plate, a liquid scintillator, a cavity for packaging the liquid scintillator, a signal input port, a signal output port, a power port, a gating circuit board, and a high-voltage power supply. The cavity is composed of a cylindrical cavity and a conical cavity connected together. The conical end of the conical cavity is provided with a circular window which is sealed by the circular quartz glass. According to the invention, the liquid scintillator is put in the cavity as a response medium, and the liquid scintillator which is of fast response and low persistence can greatly restrain persistence produced by gamma radiation. A gating circuit on the gating circuit board controls the opening time of the circular micro channel plate according to the actual situation in order to avoid the interference of strong gamma rays. The problem that strong gamma radiation signals interfere with fast neutron signals is solved.
Description
Technical field
The present invention relates to fast-neutron detection field, is to be related to a kind of fast neutron of anti-strong gamma rays interference specifically
Detector and its application process.
Background technology
Since half a century, how the energy discharged using thermonuclear fusion solves the target that energy problem is that the mankind pursue,
At present inertial confinement fusion is considered as a kind of possibility implementation of controllable fusion（International Atomic Energy Agency's tissue is write, by
W.J.Hogan is edited,《Inertial fusion energy》Nineteen ninety-five publishes）.Different from fission reaction, inertial confinement fusion generally adopts atom
Used as fuel, the light laser ablation for needing the big energy of multichannel and compressed fuel reach a high temperature high-density state the low element of ordinal number,
And then realize that thermonuclear fusion discharges fusion energy.At present, the U.S., Japan, Russia, European Union are all developing large-scale laser dress
Put, the national igniter in the U.S.（National Ignition Facility）, 192 road laser are had, gross energy output is super
Cross 1.8 million burnt, be expected to realize the inertial confinement fusion of energy gain.
In inertial confinement fusion research, the yield for obtaining Fusion Neutron is an important job, because particular energy
Neutron produce be fusion occur positive evidence, the efficiency of combustion of how many direct reaction fuel of neutron yield.Tradition is obtained
The technology of neutron time of flight spectrum is to utilize plastic scintillant, and fast neutron interacts with plastic scintillant, produces secondary fluor,
Fluorescence is collected by photomultiplier and produces electric current output, output current is processed it is counter push away neutron yield, the energy of neutron by
Its flight time determines.Plastic scintillant is simultaneously also very sensitive to the response of gamma radiation, gamma radiation generally it is to be measured it is fast in
Detector is reached before son, therefore, when the gamma radiation intensity produced with fast neutron is relatively low, traditional plastic scintillant is visited
Surveying device can utilize the difference of flight time to be distinguished from fast neutron and gamma radiation.
But, as the continuous improvement of laser intensity, particularly power reach bat watt（1015Watt）Ultra-intense laser device
Build up, the gamma radiation energy supervened in inertial confinement fusion experiment is high, intensity is big, and such gamma radiation dodges in plastics
Strong twilight sunset interference signal can be produced in bright body, and continues hundreds of nanoseconds, be superimposed upon on fast neutron signal, or even can be flooded
Fast neutron signal, the severe jamming acquisition of effective neutron signal, in this case, using plastic scintillant neutron detector
Neutron time of flight spectrum and neutron yield cannot normally be obtained.In sum, using plastic scintillant strong gamma cannot be suppressed to penetrate
The twilight sunset of line, and the signal of strong gamma rays can disturb the signal of fast neutron.
The content of the invention
To overcome the problems referred to above of the prior art, the present invention to provide a kind of fast-neutron detection of anti-strong gamma rays interference
Device and its application process.
To achieve these goals, the technical solution used in the present invention is as follows：
A kind of fast neutron detector of anti-strong gamma rays interference, it is characterised in that including circular quartz glass, visible light shield
Cover, circular microchannel plate, liquid scintillator, cavity, gate-control signal input port, the signal output part of encapsulation liquid scintillator
Mouth, power port, gating circuit plate and high voltage power supply；The cavity is the cylindrical cavity and conical cavities for linking together；The cone
The tapered end face of shape cavity arranges a circular window, and circular window is by circular quartz glass capsulation；It can be seen that light shielding mask is fixed
In conical cavities end；The outer surface of circular quartz glass and the circular microchannel plate being arranged on inside visible light shielding mask are direct
Coupling；
Gate-control signal input port, signal output port are connected inside and outside visible light shielding mask with power port；Gating circuit plate
It is arranged at outside visible light shielding mask with high voltage power supply；Gate-control signal input port two ends connect respectively circular microchannel plate and
Gating circuit plate；The circular microchannel plate of signal output port one end connection, its other end connects outside visible light shielding mask；Power supply
Port two ends connect respectively circular microchannel plate and high voltage power supply.
Specifically, the cavity is aluminum cavity.
Preferably, the high voltage power supply is the DC high-voltage power supply for exporting negative high voltage.
As described above a kind of application process of the fast neutron detector of anti-strong gamma rays interference, comprises the steps：
（1）According to fast neutron yield high low range, the volume of liquid scintillator is determined；
（2）Circular microchannel plate is configured to into several nanoseconds to number in the strong gamma rays next interim shut-in time by gating circuit plate
Between hundred nanoseconds；
（3）Liquid scintillator suppresses the twilight sunset that gamma radiation is produced；
（4）After strong gamma ray decay, before fast neutron arrival, gating circuit plate opens circular microchannel plate so that circular micro-
Channel plate obtains the fluorescence that fast neutron is produced with liquid scintillator interaction, and produces output current；
Compared with prior art, the invention has the advantages that：
（1）The present invention is placed in liquid scintillator in the cavity of encapsulation liquid scintillator, used as response medium, the liquid scintillator
For fast-response, the liquid scintillator of low twilight sunset, the twilight sunset that can significantly suppress gamma radiation to produce.
（2）The present invention controls circular microchannel according to the difference of actual conditions by the gating circuit on gating circuit plate
The unlatching working time of plate, to avoid the interference of strong gamma rays, solve strong gamma radiation signal and fast neutron signal is done
Disturb problem.
Description of the drawings
Fig. 1 is the generalized section of the present invention.
Fig. 2 is the structural representation of the present invention.
Description of reference numerals：The cavity of 1-encapsulation liquid scintillator, 2-visible light shielding mask, 3-circular quartz glass
Glass, 4-circular microchannel plate, 5-signal output port, 6-gate-control signal input port, 7-power port, 8-gate electricity
Road plate, 9-high voltage power supply, 10-liquid scintillator.
Explanation of nouns：
Microchannel plate：（Microchannel Plate, MCP）It is a kind of electron multiplication detection of high-space resolution of large area array
Device, and possess very high temporal resolution.High-performance night vision image intensifier is mainly used as, and is widely used in each scientific research neck
Domain.Microchannel plate with glass flake as base, with the space periodic of a few micrometers to more than ten microns with hexagonal periodic on substrate
The smaller micropore of arrangement aperture ratio space periodic.There are about microchannels up to a million on one piece of MCP, secondary electron can be touching on conduit wall
Hit multiplication to amplify, operation principle is similar to photomultiplier.
Specific embodiment
With reference to the accompanying drawings and examples the invention will be further described, and embodiments of the present invention are included but is not limited to
The following example.
Embodiment
As shown in Figure 1 and Figure 2, a kind of fast neutron detector of anti-strong gamma rays interference, including circular quartz glass 3, can
See light shielding mask 2, circular microchannel plate 4, liquid scintillator 10, cavity 1, the gate-control signal input port of encapsulation liquid scintillator
6th, signal output port 5, power port 7, gating circuit plate 8, high voltage power supply 9；The cavity is the cylindrical cavity for linking together
And conical cavities；The tapered end face of the conical cavities arranges a circular window, and circular window is sealed by circular quartz glass 3；
It can be seen that light shielding mask 2 is fixed on conical cavities end；The outer surface of circular quartz glass 3 and it is arranged in visible light shielding mask 2
The direct-coupling of circular microchannel plate 4 in portion；
Gate-control signal input port 6, signal output port 5 are connected inside and outside visible light shielding mask 2 with power port 7；Gate electricity
Road plate 8 and high voltage power supply 9 are arranged at outside visible light shielding mask 2；The two ends of gate-control signal input port 6 connect respectively circular micro-
Channel plate 4 and gating circuit plate 8；Gating circuit is provided with gating circuit plate 8；The connection of the one end of signal output port 5 is circular micro-
Channel plate 4, its other end connects outside visible light shielding mask 2；The two ends of power port 7 connect respectively circular microchannel plate 4 and height
Voltage source 9.
Specifically, the cavity is aluminum cavity.
Preferably, DC high-voltage power supply of the high voltage power supply 9 for output negative high voltage.
The cavity 1 of encapsulation liquid scintillator is made up of the cylindrical cavity and conical cavities that link together, and cylindrical cavity can
To store enough liquid scintillator 10, conical cavities cause the volume of circular quartz glass, and that it goes without doing is very big；Whole envelope
The cavity 1 of dress liquid scintillator can reach the effect of Used for Detecting Fast Neutrons well.
As described above a kind of application process of the fast neutron detector of anti-strong gamma rays interference, comprises the steps：
（1）According to fast neutron yield high low range, the volume of liquid scintillator is determined；
（2）Circular microchannel plate is configured to into several nanoseconds to number in the strong gamma rays next interim shut-in time by gating circuit plate
Between hundred nanoseconds；
（3）Liquid scintillator suppresses the twilight sunset that gamma radiation is produced；
（4）After strong gamma ray decay, before fast neutron arrival, gating circuit opens circular microchannel plate so that circular micro- logical
Guidance tape obtains the fluorescence that fast neutron is produced with liquid scintillator interaction, and produces output current；
The present invention is placed in liquid scintillator 10 in cavity, and used as response medium, the liquid scintillator is fast-response, low twilight sunset
Liquid scintillator, the twilight sunset that can significantly suppress gamma radiation to produce.
The present invention controls circular microchannel plate according to the difference of actual conditions by the gating circuit on gating circuit plate
The working time is opened, to avoid the interference of strong gamma rays.Solve interference of the strong gamma radiation signal to fast neutron signal to ask
Topic.
Above-described embodiment is only the preferred embodiments of the present invention, not limiting the scope of the invention, as long as using
The design principle of the present invention, and the change for carrying out non-creativeness work on this basis and making, all should belong to the present invention's
Within protection domain.
Claims (4)
1. the fast neutron detector that a kind of anti-strong gamma rays is disturbed, it is characterised in that including circular quartz glass, visible optical screen
Cover cover, circular microchannel plate, liquid scintillator, cavity, gate-control signal input port, the signal output part of encapsulation liquid scintillator
Mouth, power port, gating circuit plate and high voltage power supply；The cavity is the cylindrical cavity and conical cavities for linking together；The cone
The tapered end face of shape cavity arranges a circular window, and circular window is by circular quartz glass capsulation；It can be seen that light shielding mask is fixed
In conical cavities end；The outer surface of circular quartz glass and the circular microchannel plate being arranged on inside visible light shielding mask are direct
Coupling；
Gate-control signal input port, signal output port are connected inside and outside visible light shielding mask with power port；Gating circuit plate
It is arranged at outside visible light shielding mask with high voltage power supply；Gate-control signal input port two ends connect respectively circular microchannel plate and
Gating circuit plate；The circular microchannel plate of signal output port one end connection, its other end connects outside visible light shielding mask；Power supply
Port two ends connect respectively circular microchannel plate and high voltage power supply.
2. the fast neutron detector that a kind of anti-strong gamma rays according to claim 1 is disturbed, it is characterised in that the chamber
Body is aluminum cavity.
3. the fast neutron detector that a kind of anti-strong gamma rays according to claim 2 is disturbed, it is characterised in that the height
Voltage source is the DC high-voltage power supply for exporting negative high voltage.
4. the application process of the fast neutron detector of a kind of anti-strong gamma rays interference as described in claim 1 ~ 3, its feature
It is to comprise the steps：
（1）According to fast neutron yield high low range, the volume of liquid scintillator is determined；
（2）Circular microchannel plate is configured to into several nanoseconds to number in the strong gamma rays next interim shut-in time by gating circuit plate
Between hundred nanoseconds；
（3）Liquid scintillator suppresses the twilight sunset that gamma radiation is produced；
（4）After strong gamma ray decay, before fast neutron arrival, gating circuit plate opens circular microchannel plate so that circular micro-
Channel plate obtains the fluorescence that fast neutron is produced with liquid scintillator interaction, and produces output current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611235427.5A CN106597521A (en) | 2016-12-28 | 2016-12-28 | Fast neutron detector resisting interference of strong gamma rays and application method thereof |
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| CN201611235427.5A CN106597521A (en) | 2016-12-28 | 2016-12-28 | Fast neutron detector resisting interference of strong gamma rays and application method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980137A (en) * | 2017-05-12 | 2017-07-25 | 中国工程物理研究院核物理与化学研究所 | A kind of fast neutron detector |
| CN108828650A (en) * | 2018-08-08 | 2018-11-16 | 中国原子能科学研究院 | A kind of design method of the shielding thickness of neutron measurement device |
| CN112255664A (en) * | 2020-10-23 | 2021-01-22 | 中国工程物理研究院激光聚变研究中心 | Microchannel type fast neutron image detector |
| CN112269204A (en) * | 2020-10-23 | 2021-01-26 | 中国工程物理研究院激光聚变研究中心 | Microchannel type fast neutron flight time detector |
| CN113109862A (en) * | 2021-03-30 | 2021-07-13 | 陕西卫峰核电子有限公司 | Irradiation-resistant neutron detection device and installation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980137A (en) * | 2017-05-12 | 2017-07-25 | 中国工程物理研究院核物理与化学研究所 | A kind of fast neutron detector |
| CN108828650A (en) * | 2018-08-08 | 2018-11-16 | 中国原子能科学研究院 | A kind of design method of the shielding thickness of neutron measurement device |
| CN112255664A (en) * | 2020-10-23 | 2021-01-22 | 中国工程物理研究院激光聚变研究中心 | Microchannel type fast neutron image detector |
| CN112269204A (en) * | 2020-10-23 | 2021-01-26 | 中国工程物理研究院激光聚变研究中心 | Microchannel type fast neutron flight time detector |
| CN113109862A (en) * | 2021-03-30 | 2021-07-13 | 陕西卫峰核电子有限公司 | Irradiation-resistant neutron detection device and installation method thereof |
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