CN104464856B - A kind of fission reaction neutron flux real-time monitoring device - Google Patents
A kind of fission reaction neutron flux real-time monitoring device Download PDFInfo
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- CN104464856B CN104464856B CN201410683517.5A CN201410683517A CN104464856B CN 104464856 B CN104464856 B CN 104464856B CN 201410683517 A CN201410683517 A CN 201410683517A CN 104464856 B CN104464856 B CN 104464856B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 48
- 230000004907 flux Effects 0.000 title claims abstract description 36
- 230000004992 fission Effects 0.000 title claims abstract description 27
- 238000012806 monitoring device Methods 0.000 title claims abstract description 19
- 230000005466 cherenkov radiation Effects 0.000 claims abstract description 36
- 239000002245 particle Substances 0.000 claims abstract description 20
- 239000000523 sample Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229920001903 high density polyethylene Polymers 0.000 claims description 4
- 239000004700 high-density polyethylene Substances 0.000 claims description 4
- 239000005355 lead glass Substances 0.000 claims description 4
- ZOXJGFHDIHLPTG-BJUDXGSMSA-N Boron-10 Chemical compound [10B] ZOXJGFHDIHLPTG-BJUDXGSMSA-N 0.000 claims description 3
- 229920005479 Lucite® Polymers 0.000 claims description 3
- 229910001566 austenite Inorganic materials 0.000 claims description 3
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- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
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- 239000010937 tungsten Substances 0.000 claims description 3
- LBDSXVIYZYSRII-IGMARMGPSA-N alpha-particle Chemical compound [4He+2] LBDSXVIYZYSRII-IGMARMGPSA-N 0.000 abstract description 13
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Classifications
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
- G01T3/06—Measuring neutron radiation with scintillation detectors
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
- G21C17/108—Measuring reactor flux
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention discloses a kind of fission reaction neutron flux real-time monitoring device, incident direction along particle is sequentially placed fast neutron conversion body (1), fluorescent reflection pipe (3), bp scintillator (2), Cerenkov light reflection tube (5), Cerenkov radiation body (4), neutron and gamma-rays and enters the effect generation e of bp scintillator (2) and material+/e‑, recoil proton and alpha-particle, excite generation fluorescence, be reflected into the first photomultiplier tube (7) through fluorescent reflection pipe (3), amplified device (10) provides, after amplifying, the information that neutron adds γ；After secondary enters Cerenkov radiation body, only e+/e‑Produce Cerenkov light, after the second photomultiplier tube amplifies, provide the information of γ；Two paths of signals is subtracted each other the flux information that i.e. can get neutron.The present invention combines the difference of pulse rise time and judges n, γ signal, further increases the certainty of measurement of pulsed neutron flux.
Description
Technical field
The invention belongs to neutron detection technical field, relate to a kind of device measuring fission reaction neutron flux values, particularly relate to one
Plant fission reaction neutron flux real-time monitoring device.
Background technology
Neutron is electric neutrality, is not stopped by coulomb potential barrier when it interacts with atomic nucleus, and this allows for substantially any energy
Neutron can react with any nucleic.In the various fields of nuclear technology, neutron has application widely.From 1938
After finding that neutron can cause heavy nuclear fission year, open up the field nuclear energy that energy research is new.Along with nuclear energy develop rapidly and
Be increasingly turned to civilian from national defence, fissioning nucleus reactor has obtained developing widely and applying in many countries and regions.Nuclear energy is compared
Traditional energy has many advantages, shows powerful vitality as a kind of new energy.Monitoring to fission-neutron flux,
The information such as reactor general power and power density distribution can be provided, be very important checkup item for fission-type reactor.
Owing to neutron is electric neutrality, therefore do not had an effect by electronics during material and in material, it is impossible to directly cause ionization,
But the secondary of ionization can be caused just to be recorded by interacting to produce with atomic nucleus.Neutron can be roughly divided into by energy
Slow neutron (< 1keV), intermediate neutron (1～100keV), fast neutron (0.1～20MeV).The neutron of different-energy and material phase
The mode of interaction also has difference, conventional neutron detection method to include the method for nuclear recoil, nuclear reaction method, activation method and nuclear fission.
Under normal circumstances, the neutron energy that fission reaction produces is in the range of 0～10MeV, and neutron irradiation is not simple field,
But neutron and the mixing field of γ.As fission neutron carried out real-time, correct analysis, provide neutron flux information, it is necessary to
Want to measure the neutron that different-energy is interval simultaneously, and there is a need for being able to deduct the gamma-radiation impact on neutron flux monitoring.For
The Neutron Radiation Field of transient state, conventional method is to use time-of-flight method principle, is separated with gamma-radiation pulse by neutron.But at some
Under the conditions of experimental provision, owing to measuring the impact of environment or neutron source strength etc., there is certain limitation in ripe time-of-flight method
Property, especially in close-in measurement, the resolution of n, γ becomes a difficult problem.Therefore for the method for real-time of fission-neutron flux
Or a problem needing to solve.
Summary of the invention
In order to solve above-mentioned technical problem, the present invention provides a kind of fission reaction neutron flux real-time monitoring device, and this device utilizes
Hydrogen-rich thing is fast neutron conversion body, with bp scintillator and Cerenkov radiation body for detection medium, coordinates time performance good
Photomultiplier tube (PMT) and Fast Electronics, the real-time monitoring of fission neutron can be realized.
The present invention is by the following technical solutions:
A kind of fission reaction neutron flux real-time monitoring device, including fast neutron conversion body, bp scintillator, fluorescent reflection
Pipe, Cerenkov radiation body, Cerenkov light reflection tube, fluorescence photoconduction, the first photomultiplier tube, Cerenkov light photoconduction,
Second photomultiplier tube, the first amplifier and the second amplifier, multichannel analyzer, enumerator, data handling system, computer
With data presentation system, telnet system and probe body；Fast neutron conversion body faces toward particle incident direction, and fast neutron turns
Change body and the probe body composition that links together and close space, bp scintillator, fluorescent reflection pipe, fluorescence photoconduction, the
One photomultiplier tube, Cerenkov radiation body, Cerenkov light reflection tube, Cerenkov light photoconduction, the second photomultiplier tube are equal
It is arranged in the closing space of fast neutron conversion body and probe body composition；
Fluorescent reflection pipe is hollow structure, and its inwall is provided with fluorescent reflection layer, and fluorescence photoconduction is arranged on the opening of fluorescent reflection pipe
Form closed cavity, in bp scintillator is arranged on the closed cavity that fluorescent reflection pipe and fluorescence photoconduction are formed and with fluorescence light
Lead connection；Cerenkov light reflection tube is hollow structure, and its inwall is provided with Cerenkov reflection layer, and Cerenkov radiation body sets
Put in the closed cavity that Cerenkov light reflection tube and Cerenkov light photoconduction are formed and be connected with Cerenkov light photoconduction；
Fast neutron conversion body, fluorescent reflection pipe, bp scintillator, Cerenkov light is placed respectively anti-along particle incident direction
Penetrate pipe, Cerenkov radiation body；Fluorescence photoconduction and the first photomultiplier tube connect, and the first photomultiplier tube and the first amplifier are even
Connecing, the first amplifier is connected with multichannel analyzer, and Cerenkov light photoconduction and the second photomultiplier tube connect, the second photomultiplier transit
Pipe is connected with the second amplifier, and the second amplifier is connected with enumerator；Multichannel analyzer sum counter is sequentially connected with data and processes system
System, computer and data presentation system, computer is connected by telephone wire or netting twine with remote entry system with data presentation system
Connect.
The fission reaction neutron flux real-time monitoring device of the present invention, utilizes the signal difference of two detectors, it is possible to provide fission
The flux information of neutron, when particle enters bp scintillator, the atom of scintillator or molecule are excited and are produced fluorescence, profit
Collect fluorescence with electrooptical device, the information of particle can be recorded.Concrete principle is as follows:
Incident direction along particle places monitoring device, and after gamma-rays enters bp scintillator, it is secondary that the effect with material generates
Level charged particle is mainly e+/e-；And after neutron enters bp scintillator, the secondary band electrochondria produced in plastic scintillant
Son mainly recoil proton and alpha-particle；e+/e-, proton, alpha-particle sedimentary energy excite generation fluorescence, fluorescence in scintillator
Reflecting material reflection outside scintillator eventually enters into the first photomultiplier tube, provides a road signal after photomultiplier tube amplifies,
I.e. neutron adds the information of γ.Owing to the secondary charged particle of neutron is mainly proton and alpha-particle, charged compared to gamma-ray secondary
Particle e+/e-, the speed of proton and alpha-particle is relatively slow, utilizes the discrimination capabilities that Cerenkov is intrinsic, makes proton and alpha-particle to produce
Raw Cerenkov light and e+/e-Cerenkov light can be produced, utilize electrooptical device to collect Cerenkov light, through the second photomultiplier transit
Pipe provides another road signal after amplifying, and i.e. provides the information of γ.Two paths of signals is subtracted each other the flux information that i.e. can get neutron.Simultaneously
N, γ signal is judged by the difference in conjunction with pulse rise time, improves the certainty of measurement of pulsed neutron flux further.
Wherein, described bp scintillator belongs to the one of organic scintillator, containing substantial amounts of hydrogen atom, can be used for neutron
Detection.When charged particle is with speed v through the coefficient of refraction homogeneous transparent medium as n, if v is more than light in the medium
The phase velocity light velocity of vacuum (c/n, the c are), particle will induce light radiation, referred to as Cerenkov radiation.It can be seen that to produce
Raw Cerenkov radiation, it is necessary to particle must possess the speed of more than minimum, therefore, Cerenkov in given medium
Detector possesses intrinsic discrimination capabilities.
As to further improvement of the present invention, described probe body is designed as layer structure, is followed successively by from outside to inside
The tungsten layer of 1～1.2cm, the boracic high-density polyethylene layer of 0.5～0.6cm, wherein boracic 10 mass ratio is 8%～10%,
0.5cm austenite stainless steel layer, probe body mainly absorbs neutron and the gamma-rays of scattering, prevents scattered neutron as far as possible
Enter crystal with γ and secondary thereof, result of detection is formed interference.
As to further improvement of the present invention, the thickness of bp scintillator is 1.8～2.2cm, and Main Function is to make incident illumination
Son is most through the quantity of the secondary electron that bp scintillator generates, and is conducive to obtaining gamma-ray information as far as possible.
Cerenkov radiation body can be lucite, optics lead glass, PbF2Or vitreous silica, thickness is that 2～3 radiation are long
Degree, Main Function is that its energy is deposited on wherein by secondary as far as possible that make entrance Cerenkov radiation body, is conducive to secondary
Particle produces Cerenkov photon as much as possible wherein, thus the measurement of beneficially secondary information.
As to further improvement of the present invention, the length of Cerenkov radiation body is bigger than the length of bp scintillator
2～2.5cm, the width big 2～2.5cm of the width ratio bp scintillator of Cerenkov radiation body, Main Function is to make from boracic
The secondary of plastic scintillant outgoing sideling can enter Cerenkov radiation body, thus beneficially Cerenkov radiation body record
Secondary information as much as possible, improves the detection accuracy of incident gamma ray information.
As to further improvement of the present invention, the photomultiplier tube of Hamamatsu company selected by described first photomultiplier tube
R2083 model, the anodic pulse rise time of R2083 type PMT is 0.7ns, is suitable to do the resolved measurement of fast time course.
As to further improvement of the present invention, the photomultiplier tube of Hamamatsu company selected by described second photomultiplier tube
R1926A model, it is 160nm～850nm that R1926A measures wave-length coverage, can measure the photon of ultraviolet band, and anode arteries and veins
Rushing the rise time is 1.5ns, can be used for fast signal and measures.
The present invention utilizes bp scintillator to measure fission neutron information (wherein fast neutron and the hydrogen in bp scintillator
Atomic collision produces recoil proton, and low energy neutron produces alpha-particle with boron 10 reaction), in the contract added behind human relations of bp scintillator
Section's husband's radiant body, utilizes the intrinsic discrimination capabilities of Cerenkov to make a return journey except the shadow to neutron flux measurement of the gamma-radiation in neutron irradiation
Ring, therefore, the γ information that the present invention is not limited by neutron energy and can screen in neutron irradiation, improves fission-neutron flux
Certainty of measurement, simultaneously because scintillator and Cerenkov fluorescent lifetime the shortest (scintillator is about 10-8～10-9S, Cerenkov is less than
10-9S), coordinate Fast Electronics read-out system, can be used for the real-time monitoring of fission reaction neutron flux.
The method have the advantages that
(1), the present invention in order to realize the real-time monitoring of fission neutron, along particle incident direction place respectively fast neutron conversion body,
Fluorescent reflection pipe, bp scintillator, Cerenkov light reflection tube, Cerenkov radiation body.
(2), the thickness of bp scintillator of the present invention be 1.8～2.2cm, the photon impact on neutron measurement can be removed, carry
High photon is at the counting of Cerenkov radiation body；The thickness of Cerenkov radiation body is 2～3 cascade units, can improve photon
The Cerenkov light that secondary produces.
(3), present invention layer structure protection body (probe body) of design outside detection medium can absorb to greatest extent
Scattered neutron and gamma-rays, reduce its impact on result of detection.
Accompanying drawing explanation
Fig. 1 is the structural representation of fission reaction neutron flux real-time monitoring device of the present invention.
In figure, each numerology is as follows: 1, fast neutron conversion body；2, bp scintillator；3, fluorescent reflection pipe；4, contract
Lun Kefu radiant body；5, Cerenkov light reflection tube；6, fluorescence photoconduction；7, the first photomultiplier tube；8, Cerenkov light
Photoconduction；9, the second photomultiplier tube；10, the first amplifier；11, multichannel analyzer；12, the second amplifier；13, meter
Number device；14, data handling system；15, computer and data presentation system；16, remote entry system；17, outside detector
Shell.
Detailed description of the invention
With detailed description of the invention, technical scheme is described in further detail below in conjunction with the accompanying drawings.
With reference to Fig. 1, in fission reaction neutron flux real-time monitoring device of the present invention, fast neutron conversion body 1 and probe body 17
The composition that links together closes space, and fast neutron conversion body 1 is used for and fast neutron reaction, improves fast-neutron detection efficiency, detection
Device shell 17 is used for preventing the neutron of scattering and photon from entering detector；Bp scintillator 2, fluorescent reflection pipe 3, fluorescence
Photoconduction the 6, first photomultiplier tube (PMT1) 7, Cerenkov radiation body 4, Cerenkov light reflection tube 5, Cerenkov light
It is empty with the closing of probe body 17 composition that photoconduction the 8, second photomultiplier tube (PMT2) 9 is arranged at fast neutron conversion body 1
In；Fluorescent reflection pipe 3 is hollow structure, and its inwall is provided with fluorescent reflection layer, and fluorescence photoconduction 6 is arranged on fluorescent reflection pipe 3
Opening, on fluorescent reflection pipe 3, one end of non-coating and fluorescence photoconduction 6 seal and form closed cavity, bp scintillator
In 2 are arranged on the closed cavity that fluorescent reflection pipe 3 is formed with fluorescence photoconduction 6 and it is connected with fluorescence photoconduction 6；Cerenkov light is anti-
Penetrating pipe 5 is hollow structure, and its inwall is provided with Cerenkov reflection layer, and it is anti-that Cerenkov radiation body 4 is arranged on Cerenkov light
Penetrate the opening of pipe 5 and Cerenkov light photoconduction 8, one end of non-coating and Cerenkov light light on Cerenkov light reflection tube 5
Leading 8 sealings and form closed cavity, Cerenkov radiation body 4 is arranged on Cerenkov light reflection tube 5 and Cerenkov light photoconduction 8
In the closed cavity formed and it is connected with Cerenkov light photoconduction 8.
Fast neutron conversion body 1, fluorescent reflection pipe 3, bp scintillator 2, Cerenkov is placed respectively along particle incident direction
Luminous reflectance pipe 5, Cerenkov radiation body 4, bp scintillator 2 is used for reacting generation fluorescence with neutron and photon, and fluorescence is anti-
The fluorescent reflection layer penetrating pipe 3 inwall makes fluorescence enter fluorescence photoconduction 6 for reflected fluorescent light, and Cerenkov radiation body 4 is used for secondary
Level particle reaction produces Cerenkov light, and the Cerenkov reflection layer of Cerenkov light reflection tube 5 is used for reflecting Cerenkov light
Make it into Cerenkov light photoconduction 8；First photomultiplier tube 7 is connected with fluorescence photoconduction 6, and fluorescence photoconduction 6 is used for making fluorescence
Photon enters the first photomultiplier tube 7, and the first photomultiplier tube 7 is used for fluorescent photon is converted into the signal of telecommunication, the second photoelectricity times
Increasing pipe 9 to be connected with Cerenkov light photoconduction 8, Cerenkov light photoconduction 8 is used for making Cerenkov light photon enter the second photoelectricity times
Increasing pipe 9, the second photomultiplier tube 9 is used for Cerenkov light photon conversion is become the signal of telecommunication.
First photomultiplier tube 7 is connected by cable and the first amplifier 10, and the first amplifier 10 is logical after signal amplifies molding
Crossing cable input multichannel analyzer 11, the second photomultiplier tube 9 is connected by cable and the second amplifier 12, the second amplifier
12 signal amplified molding after input enumerator 13 by cable, the signal collected is led to by multichannel analyzer 11 sum counter 13
Crossing cable input data processing system 14, data handling system 14 utilizes modern mathematics analysis skill to provide neutron flux information,
And these data are sent to computer and data presentation system 15, data presentation system shows neutron flux information in real time, calculates
Machine is connected by telephone wire or netting twine with remote entry system 16 with data presentation system 15, and available remote entry system is entered
Row remotely controls and self-inspection.
The present invention in the specific implementation, can buy at crystal production manufacturer by bp scintillator 2, Cerenkov radiation body 4,
As: Saint Gobain, the thickness of the bp scintillator of the present embodiment is 1.8～2.2cm, and Cerenkov radiation body can be
Lucite, optics lead glass, PbF2Or vitreous silica, thickness is 2～3 cascade units；The length of Cerenkov radiation body
Bigger than the length of bp scintillator 2～2.5cm, the width of the width ratio bp scintillator of Cerenkov radiation body is big
2～2.5cm.First photomultiplier tube 7, the second photomultiplier tube 9 can buy from photomultiplier tube production firm, such as:
Hamamatsu, first photomultiplier tube 7 of the present embodiment uses R2083 type photomultiplier tube, and the anodic pulse rise time is
0.7ns, the second photomultiplier tube 9 uses measures the R1926A model that wave-length coverage is 160nm～850nm.Amplifier oneself
Developing the most commercially available, multichannel analyzer 11 sum counter 13 is directly bought, such as ORTEC or the product of Canberra company, soon
Neutron conversion body 1 is designed according to analog result, utilize hydrogen-rich thing for fast neutron conversion body, fluorescent reflection pipe 3, fluorescence light
Leading 6, Cerenkov light reflection tube 5 and Cerenkov light photoconduction 8 and use prior art, probe body 17 is by substantial amounts of examination
Test and analogue simulation, devise a kind of more satisfactory structure according to practical situation, be followed successively by the tungsten layer of 1～1.2cm from outside to inside,
The boracic high-density polyethylene layer of 0.5～0.6cm, wherein the mass ratio of boracic 10 is 8%～10%, 0.5cm austenite
Stainless steel layer.
The work process of the present invention is: by fast neutron conversion body 1 in device just to neutron and gamma-radiation incident direction, as neutron and γ
Entering in bp scintillator 2, fast neutron produces recoil proton, mental retardation with the atomic reaction of hydrogen in bp scintillator 2
Neutron generates lithium 7 and alpha-particle with boron 10 reaction in bp scintillator 2, and γ photon produces with bp scintillator 2 reaction
Giving birth to positron-electron, recoil proton, lithium 7, alpha-particle and positron-electron make the atom in bp scintillator 2 or molecule excite,
These atoms or molecule launch fluorescent photon in de excitation is sent out, and these fluorescent photons are by entering fluorescence after the reflection of fluorescent reflection layer
Photoconduction 6, eventually enters into the first photomultiplier tube 7 and is converted into the signal of telecommunication, is exaggerated device 10 and amplifies entrance multichannel analyzer 11；If
These secondary charged particle are not all deposited on energy in bp scintillator 2, it is likely that enter Cerenkov radiation body
4, compared to positron-electron, proton, lithium 7, alpha-particle speed much smaller and penetration capacity is much smaller than positron-electron, the most right
In selected machine glass, optics lead glass, PbF2, vitreous silica, positron-electron can produce Cerenkov light wherein, and
Proton, lithium 7, alpha-particle cannot produce Cerenkov light, this γ light showing to be measured original incident by Cerenkov light
The information of son, these Cerenkov light photons are by entering Cerenkov light photoconduction 8 after the reflection of Cerenkov reflection layer,
Enter the second photomultiplier tube 9 eventually and be converted into the signal of telecommunication, amplified entrance enumerator 13 by the second amplifier 12；Multichannel analyzer
The data that 11 sum counters 13 gather all send into data handling system 14, obtain fission-neutron flux information, and by calculating
Machine and data presentation system 15 show in real time and timing stores, and these data can be transferred to the management system of user and control system
In system.
In sum, the fission reaction neutron flux real-time monitoring device of the present invention, there is fluorescent lifetime quickly, in conjunction with fast electricity
Son is learned, and can be used for monitoring in real time fission-neutron flux.Incident direction along particle is placed monitoring device, neutron and gamma-rays entrance and is contained
After boron plastic scintillant, the effect with material generates e+/e-, recoil proton and alpha-particle, can in scintillator sedimentary energy exciting
Producing fluorescence, fluorescence reflecting material reflection outside scintillator eventually enters into the first photomultiplier tube, after photomultiplier tube amplifies
Provide the information that neutron adds γ.Compared to gamma-ray secondary charged particle e+/e-, the speed of proton and alpha-particle is relatively slow, works as secondary
After particle enters Cerenkov radiation body, only e+/e-Cerenkov light can be produced, utilize electrooptical device to collect Cerenkov light,
The information of γ can be given after the second photomultiplier tube amplifies.Two paths of signals is subtracted each other the flux information that i.e. can get neutron.Tie simultaneously
Close the difference of pulse rise time n, γ signal is judged, improve the certainty of measurement of pulsed neutron flux further.
The above, the only present invention preferably specific embodiments, protection scope of the present invention is not limited to this, any is familiar with basis
Those skilled in the art in the technical scope of present disclosure, the simple change of the technical scheme that can become apparent to
Or equivalence replacement each falls within protection scope of the present invention.
Claims (7)
1. a fission reaction neutron flux real-time monitoring device, it is characterized in that, including fast neutron conversion body (1), bp scintillator (2), fluorescent reflection pipe (3), Cerenkov radiation body (4), Cerenkov light reflection tube (5), fluorescence photoconduction (6), first photomultiplier tube (7), Cerenkov light photoconduction (8), second photomultiplier tube (9), first amplifier (10) and the second amplifier (12), multichannel analyzer (11), enumerator (13), data handling system (14), computer and data presentation system (15), telnet system (16) and probe body (17)；Fast neutron conversion body (1) faces toward particle incident direction, fast neutron conversion body (1) and probe body (17) composition that links together closes space, and bp scintillator (2), fluorescent reflection pipe (3), fluorescence photoconduction (6), the first photomultiplier tube (7), Cerenkov radiation body (4), Cerenkov light reflection tube (5), Cerenkov light photoconduction (8), the second photomultiplier tube (9) are arranged in the closing space that fast neutron conversion body (1) and probe body (17) form；
Fluorescent reflection pipe (3) is hollow structure, its inwall is provided with fluorescent reflection layer, fluorescence photoconduction (6) is arranged on the opening of fluorescent reflection pipe (3) and forms closed cavity, in bp scintillator (2) is arranged on the closed cavity that fluorescent reflection pipe (3) is formed with fluorescence photoconduction (6) and is connected with fluorescence photoconduction (6)；Cerenkov light reflection tube (5) is hollow structure, its inwall is provided with Cerenkov reflection layer, in the closed cavity that Cerenkov radiation body (4) is arranged on Cerenkov light reflection tube (5) and Cerenkov light photoconduction (8) is formed and is connected with Cerenkov light photoconduction (8)；
Fast neutron conversion body (1), fluorescent reflection pipe (3), bp scintillator (2), Cerenkov light reflection tube (5), Cerenkov radiation body (4) is placed respectively along particle incident direction；Fluorescence photoconduction (6) is connected with the first photomultiplier tube (7), first photomultiplier tube (7) is connected with the first amplifier (10), first amplifier (10) is connected with multichannel analyzer (11), Cerenkov light photoconduction (8) is connected with the second photomultiplier tube (9), second photomultiplier tube (9) is connected with the second amplifier (12), and the second amplifier (12) is connected with enumerator (13)；Multichannel analyzer (11) sum counter (13) is sequentially connected with data handling system (14), computer and data presentation system (15), and computer is connected by telephone wire or netting twine with remote entry system (16) with data presentation system (15).
Fission reaction neutron flux real-time monitoring device the most according to claim 1, it is characterized in that, described probe body (17) is layer structure, it is followed successively by the tungsten layer of 1 ~ 1.2cm from outside to inside, the boracic high-density polyethylene layer of 0.5 ~ 0.6cm, 0.5cm austenite stainless steel layer, wherein boron 10 mass ratio in boracic high-density polyethylene layer is 8% ~ 10%.
Fission reaction neutron flux real-time monitoring device the most according to claim 1, it is characterised in that the thickness of bp scintillator (2) is 1.8 ~ 2.2cm.
Fission reaction neutron flux real-time monitoring device the most according to claim 1, it is characterised in that Cerenkov radiation body (4) is lucite, optics lead glass, PbF2Or vitreous silica, thickness is 2 ~ 3 cascade units.
Fission reaction neutron flux real-time monitoring device the most according to claim 1, it is characterized in that, the length of Cerenkov radiation body (4) is than the big 2 ~ 2.5cm of length, the big 2 ~ 2.5cm of width of width ratio bp scintillator (2) of Cerenkov radiation body (4) of bp scintillator (2).
Fission reaction neutron flux real-time monitoring device the most according to claim 1, it is characterised in that described first photomultiplier tube (7) selects the photomultiplier tube R2083 model of Hamamatsu company, and the anodic pulse rise time of R2083 type PMT is 0.7ns.
Fission reaction neutron flux real-time monitoring device the most according to claim 1, it is characterised in that the photomultiplier tube R1926A model of Hamamatsu company selected by the second photomultiplier tube (9), it is 160nm ~ 850nm that R1926A measures wave-length coverage.
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