CN105022084B - A kind of digitlization neutron spectrometer - Google Patents
A kind of digitlization neutron spectrometer Download PDFInfo
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- CN105022084B CN105022084B CN201510514434.8A CN201510514434A CN105022084B CN 105022084 B CN105022084 B CN 105022084B CN 201510514434 A CN201510514434 A CN 201510514434A CN 105022084 B CN105022084 B CN 105022084B
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Abstract
The present invention relates to a kind of digitlization neutron spectrometer, including detector cells, mechanical control unit, digital collection unit and discriminator unit；Detector cells are used to detect the middle sub-information of radiation field to be measured；Mechanical control unit is used to control the rotation and lifting of detector cells；Digital collection unit is used to the analog signal that detector cells generate being converted to digital signal；For discriminator unit for analyzing the pulse shape of detector cells, real-time judge belongs to neutron pulse signal or gamma-ray burst signal.The neutron spectrometer neutron energy measurement range of the present invention is wide；It can effectively determine detector measurement active centre position；It reduces detector and mutually scatters influence；With good neutron, the real-time discrimination capabilities of photon, neutron, gamma spectrum information are provided respectively in real time in Mixed n-γRadiation Field.
Description
Technical field
The invention belongs to radioactive radiation fields of measurement, and in particular to a kind of digitlization neutron spectrometer.
Background technology
Although since last century five, the sixties, international developed country has just carried out live neutron spectrum measurement technology
Research, but the limitation of the complexity and environmental condition due to workplace radiation field, ripe practical spectrometer type is simultaneously few.
Scene neutron spectrometer is up to more ball spectrometers at present, also known as bonner sphere spectrometer, has carried out numerous studies report both at home and abroad
Road.A series of polyethylene ball by different radiis and the spherical shape positioned at the centre of sphere3He or BF3Proportional counter forms, polyethylene ball
Radius is respectively 2.5 inches, 3 inches, 3.5 inches, 4 inches, 5 inches, 6 inches, 8 inches, 10 inches and 12 inches, can be surveyed
Neutron energy scope is thermal neutron -20MeV.More main deficiencies of ball spectrometer are：1. more ball spectrometers utilize few road spectrum unscrambling mechanism,
Neutron energy resolution ratio is poor in the range of more than 1MeV fast-neutron ranges；2. measurement process is cumbersome, it is necessary to which survey crew is measuring
Various sizes of polyethylene ball detector is put in position successively, and the neutron energy spectrum for measuring a certain position generally requires one day or several
Its time；3. the spectrometer of ball more than can only deduct γ events by way of simply blocking lower threshold, and Neutron Radiation Field is usually associated with greatly
The γ events of amount, more ball spectrometers cannot be distinguished accumulation γ events, can not provide and screen photons spectrum information.
Bibliographic reference on the more ball spectrometers of neutron is as follows：
Bonner sphere spectrometers—a critical review,Nuclear Instruments
and Methods in Physics Research A 476(2002)12-20；
Neutron Spectrometry in Mixed Fields:Multisphere Spectrometers,
Radiation Protection Dosimetry Vol.107,Nos 1-3,pp.37-72(2003)；
Neutron spectrometer based on recoil proton method it is currently the only commercially be the NATO military tissue research and development ROSPEC spectrum
Instrument by three small size counters (2cm radiuses), fills 1atm, 4atm, 10atm hydrogen and a large volume counter respectively
(6 inches of diameter) fills the argon methane gas of 0.5Mpa.This combinations of detectors can make ROSPEC spectrometer systems cover energy model
It encloses from 50keV~4.5MeV.These combinations of detectors are mounted on a plate that slowly can continuously rotate.The rotation of plate
It is completed by electric rotating machine.It is substantial amounts of integrated circuit plate to rotate below plate, is put including master, 4 pieces of independent ADCs, low tension
Source and a microcomputer.The processing and acquisition of computer control signal, it is then logical from caching among data first are stored in caching
The RS422 interfaces for crossing a rotation are connected in computer.Data acquisition computer can be near spectrometer end of probe, can also be
Beyond 1km.The spectrometer advantage is very convenient, and four detectors measure simultaneously.Also clearly, main problem is shortcoming：1.
Neutron energy scope 50keV~4.5MeV is measured, can not cover ground nuclear facilities place thermal energy~20MeV can area's scope；2. four
There are the problem that neutron mutually scatters between a detector, and Dan Nengdian receptance functions determine to be determined by single detector, nothing
Method considers the mutual scattering problems between detector；3. the active centre position of detector can not be determined, Rospec spectrometers are optimal
Measuring condition is that the neutron energy spectrum information of a certain measurement position can not be provided in homogeneous radiation field.4.Rospec spectrometers also only
γ events can be deducted by way of simply blocking lower threshold, accumulation γ events cannot be distinguished, can not provide and screen photons spectrum information；
Bibliographic reference on Rospec neutron spectrometers is as follows：
Neutron Spectrometry in Mixed Fields:Proportional Counter
Spectrometers,Radiation Protection Dosimetry Vol.107,Nos 1-3,pp. 73-93(2003)；
Rospec–A Simple Reliable High Resolution Neutron Spectrometer,
Radiation Protection Dosimetry Vol.70,No.1-4pp.273-278.。
The content of the invention
For defect in the prior art, the present invention provides a kind of digitlization neutron spectrometer, neutron energy measurement model
Enclose width；It can determine detector measurement active centre position；It reduces detector and mutually scatters influence；With good neutron, light
The real-time discrimination capabilities of son.
To achieve the above objectives, the technical solution adopted by the present invention is：A kind of digitlization neutron spectrometer is provided, including detection
Device unit, mechanical control unit, digital collection unit and discriminator unit, it is characterized in that：The detector cells are used to detect
The middle sub-information of radiation field to be measured；The mechanical control unit is used to control the rotation and lifting of detector cells；The number
Collecting unit is used to the analog signal that detector cells generate being converted to digital signal；Discriminator unit is used for detector cells
Pulse shape analyzed, real-time judge is neutron pulse signal or gamma-ray burst signal.
Further, the neutron spectrometer further includes multi-channel analysis unit, which is used to extract pulse signal
Maximum amplitude information, then by real-time processing module algorithm for design, establish pulse amplitude spectrum.
Further, the neutron spectrometer further includes spectrum unscrambling unit, and the spectrum unscrambling unit is responded by establishing detector cells
Matrix function carries out multiple tracks spectrum unscrambling calculating using maximum entropy, multiple iterative algorithm, is neutron by the deconvolution of neutron pulse amplitude spectrum
Power spectrum.
Further, the neutron spectrometer further includes nuclear electronics unit, which is used for the detector
Unit provides low-tension supply, high voltage power supply and pulse amplifying shaping.
Further, the detector cells include gas-filled detector and liquid scintillation detector, the inflatable detection
Device includes BF3Counter and hydrogeneous counter, the BF3Counter includes exposed BF3The BF of counter and bag cadmium3It counts
Device.
Further, the mechanical control unit includes the disk of rotation and lifting, and the gas-filled detector and liquid dodge
Bright detector is evenly arranged on the disk, and the active centre of gas-filled detector and liquid scintillation detector is located at same height
Degree.
Further, the digital collection unit includes data collecting card, which is used to gathering and recording complexity
The intermediate frequency and radiofrequency signal of various modulation formats in environment, and the initial data of acquisition is stored into disk array, pass through height
Fast internal bus submits to CPU high speed processors, completes signal high speed processing and analysis.
The advantageous effects of the present invention are：
1) neutron energy measurement range is wide, thermal energy~20MeV；
2) measurement active centre position, center uncertainty U=0.01% (k=2) can effectively be determined；
3) effectively reduce detector and mutually scatter influence, neutron scattering background caused by detector mutually scatters<3%；
4) there is good neutron, the live neutron spectrometer of the real-time discrimination capabilities of photon, it can be in Mixed n-γRadiation Field
Neutron, gamma spectrum information, neutron, γ discrimination factors are provided respectively in real time>1.5；
5) neutron, gamma spectrum information can be provided after being measured in real time；
6) more than 1MeV neutron energy ranges scope neutron energy good resolution is in 5%.
Description of the drawings
Fig. 1 is the structure diagram of present invention digitlization neutron spectrometer；
Fig. 2 is the structure diagram of neutron spectrometer mechanical system unit of the present invention；
Fig. 3 is to screen algorithm using number to screen241Screen spectrum in Am-Be sources；
Fig. 4 is the present invention241Am-Be neutron sources measure neutron energy spectrum.
Specific embodiment
Below in conjunction with the accompanying drawings, the specific embodiment of the present invention is described in further detail.
As shown in Figure 1, the digitlization neutron spectrometer of the present invention includes 6 detector cells, mechanical control unit, nuclear electrons
Learn unit, digital collection unit, discriminator unit, multi-channel analysis unit, spectrum unscrambling unit.
Introduce individually below correlation unit serve function and.
1) detector cells
Detector cells use 6 detectors, including 5 gas-filled detectors and 1 liquid scintillation detector.5 are filled
Gas formula detector, two of which are BF3Counter, the other three are hydrogeneous counters.
According to10B(n,α)7Li reacts, inflatable BF3Counter can not provide neutron energy spectrum information.One of BF3Detection
Device is exposed, another bag cadmium, so provides counting to neutron of the neutron energy in (0.025-0.5) eV.3 different gas
The hydrogeneous counter of pressure records the neutron signal of (50-250) keV, (200-650) keV and (0.5-1.5) MeV respectively.This
A little detectors detect neutron using recoil proton mechanism.Liquid scintillation detector model is BC501A, for recording more than 1MeV
The neutron signal in energy area.
BF3 detectors model of the present invention is the 5EB70/13E of CENTRONIC companies, sensitive volume diameter 13mm, sensitive volume
Effective length 50mm, BF3Gas pressure intensity 70cmHg.Nuclear industry place neutron energy spectrum is mainly considered substantially all using this specification
It is fission neutron Slowing-down Spectrum, thermal neutron fluence rate is high, so thermal-neutron detector need to be selected to respond low detection for neutron fluence
Device reduces the spectrometer dead time.Exposed BF3Counter, concrete model are CENTRONIC companies, another bag 0.5mm thickness
Cadmium.Using cadmium to thermal neutron there is the cutting neutron effect of 0.5eV, absorb neutron of the energy in below 0.5eV.Exposed BF3Meter
Number device：Thermal neutron+above-thermal neutron；Bag cadmium BF3 counters：Above-thermal neutron；Exposed BF3Counter counting-bag cadmium BF3Counter counts
Count=hanker sub-count；It can area's neutron counting so as to obtain below 0.5eV.
The hydrogeneous counter of 3 different air pressures records the neutron signal in 50keV-1.5MeV energy area respectively.Hydrogeneous direct ratio meter
Number device detects neutron using recoil proton mechanism.Hydrogeneous proportional counter air pressure is higher, and it is bigger to deposit recoil proton energy, but
It is that low energy proton can be mixed with gamma-rays, Electronics noice so as to cannot be distinguished, therefore hydrogeneous proportional counter air pressure selection pair
There is direct relation in neutron energy scope can be surveyed.First hydrogeneous proportional counter parameter is as follows：Air pressure 1atm, spherical sensitive volume
Diameter 40mm, measurement neutron energy scope 50keV-250keV；Second hydrogeneous proportional counter parameter is as follows：Air pressure 3atm,
Spherical sensitive volume diameter 40mm, measurement neutron energy scope 200keV-600keV；3rd hydrogeneous proportional counter parameter is such as
Under：Air pressure 10atm, spherical sensitive volume diameter 40mm, measurement neutron energy scope 500keV-1.5MeV.
Liquid scintillation detector model is company of Saint-Gobain BC501A, and crystalline size is as follows：Φ5.08cm ×5.08cm.
Fast neutron is measured using recoil proton mechanism, it can the neutron signal in area and γ signals for recording more than 1MeV.Due to organic sudden strain of a muscle
Bright body has good neutron, γ discrimination capabilities, so that digitlization neutron spectrometer covering neutron energy scope thermal energy-
20MeV, photon energy range 100keV-10MeV.
Neutron spectrometer of the invention covering neutron energy scope thermal energy -20MeV, photon energy range 100keV- as a result,
10MeV has neutron, the real-time discrimination capabilities of gamma-rays.
2) mechanical control unit
Mechanical control unit is to control the rotation and lifting of 6 probe units, in order to realize the automatic of detector cells
Control while accurately definite neutron spectrometer active centre reduce scattering background influence between multiple detectors, consider above-mentioned
Three aspect factor devises spectrometer mechanical control unit.6 detectors are evenly arranged in rotating circular disc surface, each detector
Between 60 ° of angle, 6 detector active centres are located at sustained height, during actual measurement, each detector rotate successively 60 ° ±
1 ', raise 15cm ± 0.1mm.Mechanical control unit includes electric rotating machine and lifting motor, passes through RS232 signal wires and control
Cabinet connects, and control baseline includes Switching Power Supply, PLC control modules and motor drive module, as shown in Figure 2.
Control unit of the invention can effectively determine the position of measuring center as a result, reduce detector and mutually scatter shadow
It rings.
3) nuclear electronics unit
Nuclear electronics unit is used to provide low ripple low-tension supply, 6 high voltage power supplies, output point to 6 detector cells
It Wei not 1600V, 1600V, 1500V, 2300V, 4800V, -1700V；Nuclear electronics unit includes preposition amplification shaping module, single
A pulse width 1-2 μ s amplify for pulse signal, and signal-to-noise ratio improves.
4) digital collection unit
Digital collection unit includes Data Acquisition Card, the ATS9350 Data Acquisition Cards produced using Alartech companies,
Sample rate 500MS/s, resolution ratio 12.Analog signal high-speed transitions for detector to be generated are digital signal, as number
The input signal of word pulse analysis.Since the die-away time of pulse signal is between (20-300) ns, so Data Acquisition Card
Sampling rate should be in 500MS/s.Guarantee has enough sampled points that can reflect actual pulse shape.When sample rate is 500MS/
During s, the sampled point of a pulse is at 150 or so.It is studied simultaneously as to be differentiated into the digitlization particle of line-pulse signal,
Need that pulse signals die-away time blocks 20ns respectively and the time window of 300ns is integrated, this requires data acquisition fixtures
There is ps grades of internal clocking precision.Data collecting card is made data flow to calculator memory speed and is reached using the interface of PCI-E × 8
>1.4GB/s is merged using the storage of extensive disk array and Modern Signal Analysis treatment technology, is used to implement acquisition
With record complex environment site environment in various modulation formats intermediate frequency or radiofrequency signal, by the original signal data of acquisition with height
It is directly stored in up to 1.4GB/s speed in disk array, disk array is hung using SATA3 agreements using RAID disk RAID card
It carries 10 pieces of hard disks and realizes 10T disk arrays, realize that data submit to CPU high speed processings by the high-speed internal bus of 8GB/s
Device completes signal high speed processing and analysis.According to mixing field radiation characteristic and operating environment requirements around nuclear facilities, use
ARP690 Portable Reinforced cabinets.
5) neutron, photon discriminator unit
By liquid scintillation detector pulse form analysis, pass through signal trailing edge time window Δ t real-time judge neutron arteries and veins
Punching or gamma-ray burst signal.The fluorescence signal that BC501A liquid scintillation detectors are generated by electronics or particle excitated de excitation
There is the lifetime that 270ns-3ns is different.Beat that there are one risings quickly by the pulse meeting that machine or anode export by the last one
Phase.A tail is mainly determined and hauls out by the performance of photoelectric tube (1.66-3) ns, there are the slow components and 30ns of 270ns
Fast component.Slow component can increase with the increase of the prevention energy of secondary charged particle.Here it is using pulse shape into
Row signal screening.
6) multi-channel analysis unit
Pulse signal maximum amplitude information is extracted, maximum amplitude is directly proportional to incoming particle sedimentary energy, real by developing
When handle software algorithm, establish pulse amplitude spectrum.The present invention designs pulse amplitude spectrum according to the resolution ratio of adc data capture card
The theoretical maximum amplitude of road number and pulse amplitude spectrum.One pulse signal array of ADC acquisitions, has carried out digitlization particle
It screens after judging, it is necessary to which the integrated signal 2 with energy information is respectively fed to neutron pulse amplitude two-dimensional matrix and γ arteries and veins
Rush amplitude two-dimensional matrix.Algorithm for design, according to 2 amplitude of energy information integrated signal, to corresponding pulses amplitude spectrum two-dimensional matrix
The counting unit of corresponding road number adds up.Realize the multi-channel analysis of neutron/γ signal pulse amplitudes spectrum.
7) spectrum unscrambling unit
It establishes liquid and dodges detector, hydrogeneous proportional counter response matrix function, response matrix function interval 50keV is utilized
Maximum entropy, multiple iterative algorithm carry out multiple tracks spectrum unscrambling calculating, are neutron energy spectrum by the deconvolution of neutron pulse amplitude spectrum.
Hydrogeneous direct ratio meter is determined by testing method of the measurement receptance function compared with covering card program and calculating receptance function
Number device SP10 (1atm), SP10 (3atm), SP10 (10atm) determine BC501A in 1MeV- in (50-250) keV receptance functions
20MeV receptance functions determine naked BF3Bag cadmium BF3In the efficiency of below 0.5eV.
Theoretical calculation uses Geant4 programs, simulation calculate SP10 (1atm) 50keV-250keV can area receptance function,
According to hydrogeneous proportional counter energy resolution 7% or so, single energy receptance function, the energy area are calculated per 20keV energy bites
Single energy receptance function 10；Simulation calculates SP10 (3atm) between (200-650) keV energy area receptance function, every 30keV energy
Every calculating receptance function, the energy area is single can receptance function 15；Simulation calculates SP10 (10atm) detectors in (0.5-1.5) MeV
Energy area receptance function, receptance function, receptance function 17 are calculated per 60keV；BC501A detectors are calculated in 1MeV-20MeV energy
Measure area's receptance function, energy bite 500keV, receptance function 40；Calculate BF3Detector is in 0.5eV efficiency below curves.
The present invention utilizes metrology and measurement portion of China Atomic Energy Science Research Institute241Am-Be neutron source Reference radiation fields are carried out
The performance test of instrument.Shadow cone blocks tested detector cells, in this way, gear shadow cone spectrometry result is room scattered neutron and detection
The sum of mutual scattered neutron of device.
1. it measures the hydrogeneous proportional counters of 10atm in spectrometer system (rise 20cm) to exist241Cone is kept off at Am-Be radioactive sources 1m
Background spectrum counts.2. the hydrogeneous proportional counters of 10atm (not raising 20cm) exist in measurement spectrometer system241At Am-Be radioactive sources 1m
Place gear cone background spectrum count.Experimental data is as shown in table 1.
1. detector of table mutually scatters interferometry data.
The experimental results showed that only account for total neutron using the mutual scattered neutron contribution of design structure detector of this spectrometer
2.9%, for BF3Wait the contribution of thermal neutrons sensitive detector scattered neutron reduction can be more obvious.
2. it utilizes241Am-Be radionuclide neutron sources measure241Am-Be source neutron power spectrums, neutron energy spectrum after spectrum unscrambling,
As shown in figure 4, it coincide very well with the ISO-8529 standard power spectrums recommended.From Fig. 4 it can be seen that neutron energy good resolution in
5%, neutron measurement energy range covering thermal energy -20MeV.
As shown in figure 4, it measures to obtain using this neutron spectrometer241Am-Be neutron energy spectrums, wherein A curves are ISO-
8529 recommend spectrum, and B curves are this spectrometer measurement spectrums.
3. algorithm is screened using digitlization neutron, γ,241The measurement of Am-Be neutron sources is screened as a result, such as Fig. 3 institutes in real time
Show, digitlization screens algorithm discrimination factor and is much better than analog circuit discrimination factor.
The digitlization neutron spectrometer of the present invention is not limited to above-mentioned specific embodiment, and those skilled in the art are according to this hair
Bright technical solution draws other embodiments, also belongs to the technological innovation scope of the present invention.
Claims (6)
1. a kind of digitlization neutron spectrometer including detector cells, mechanical control unit, digital collection unit and is screened single
Member, it is characterized in that：The detector cells are used to detect the middle sub-information of radiation field to be measured；The mechanical control unit is used to control
The rotation and lifting of detector cells processed；The digital collection unit is used to be converted to the analog signal that detector cells generate
Digital signal；Discriminator unit for analyzing the pulse shape of detector cells, real-time judge be neutron pulse signal also
It is gamma-ray burst signal；
The detector cells include 5 gas-filled detectors and 1 liquid scintillation detector；
The mechanical control unit includes the disk of rotation and lifting, and the gas-filled detector and liquid scintillation detector are uniform
It is arranged on the disk, and the active centre of gas-filled detector and liquid scintillation detector is located at sustained height；
6 detectors are evenly arranged in rotating circular disc surface, 60 ° of angle between each detector, 6 detector active centre positions
When sustained height, actual measurement, each detector rotates 60 ° ± 1 ' successively, raises 15cm ± 0.1mm.
2. a kind of digitlization neutron spectrometer as described in claim 1, it is characterized in that：The neutron spectrometer further includes multi-channel analysis
Unit, the multi-channel analysis unit are used to extracting the maximum amplitude information of pulse signal, then by real-time processing module algorithm for design,
Establish pulse amplitude spectrum.
3. a kind of digitlization neutron spectrometer as claimed in claim 2, it is characterized in that：The neutron spectrometer further includes spectrum unscrambling list
Member, the spectrum unscrambling unit carry out multiple tracks by establishing detector cells response matrix function, using maximum entropy, multiple iterative algorithm
Spectrum unscrambling calculates, and is neutron energy spectrum by the deconvolution of neutron pulse amplitude spectrum.
4. a kind of digitlization neutron spectrometer as claimed in claim 3, it is characterized in that：The neutron spectrometer further includes nuclear electronics
Unit, the nuclear electronics unit are used to provide low-tension supply, high voltage power supply and pulse amplifying shaping to the detector cells.
5. a kind of such as digitlization neutron spectrometer of claim 1-4 any one of them, it is characterized in that：The gas-filled detector bag
Include BF3Counter and hydrogeneous counter, the BF3Counter includes exposed BF3The BF of counter and bag cadmium3Counter.
6. a kind of digitlization neutron spectrometer as claimed in claim 5, it is characterized in that：The digital collection unit is adopted including data
Truck, the data collecting card are used to gather and record the intermediate frequency and radiofrequency signal of various modulation formats in complex environment, and will obtain
The initial data taken is stored into disk array, and CPU high speed processors are submitted to by high-speed internal bus, completes signal at a high speed
Processing and analysis.
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| CN106597521A (en) * | 2016-12-28 | 2017-04-26 | 中国工程物理研究院激光聚变研究中心 | Fast neutron detector resisting interference of strong gamma rays and application method thereof |
| CN106908830B (en) * | 2017-02-16 | 2018-10-02 | 中国科学院合肥物质科学研究院 | The measuring system of neutron flux is measured under a kind of intense radiation hot conditions |
| CN108152846A (en) * | 2017-12-05 | 2018-06-12 | 中国原子能科学研究院 | A kind of digitalization radiation inert gas133Xe activity coincidence measurement devices |
| CN109975854B (en) * | 2017-12-27 | 2020-12-11 | 同方威视技术股份有限公司 | Method and system for pulse waveform discrimination |
| CN109211952A (en) * | 2018-10-30 | 2019-01-15 | 中国工程物理研究院核物理与化学研究所 | A kind of neutron scattering spectrometer control system |
| CN110347084B (en) * | 2019-07-15 | 2024-04-12 | 散裂中子源科学中心 | CSNS engineering spectrometer control device and signal processing method of control device |
| CN112925006A (en) * | 2019-12-05 | 2021-06-08 | 核工业西南物理研究院 | Fusion neutron real-time energy spectrum resolution method for magnetic confinement device |
| CN111025374B (en) * | 2019-12-13 | 2023-03-28 | 中国电子科技集团公司第五十八研究所 | DDS device neutron effect evaluation system |
| CN111158040B (en) * | 2019-12-27 | 2021-09-28 | 中国原子能科学研究院 | Layout structure for improving compton inhibition factor of anti-well-being spectrometer |
| CN113126140A (en) * | 2019-12-30 | 2021-07-16 | 中核控制系统工程有限公司 | System and method for real-time discrimination of high-speed digital n/gamma waveforms |
| CN113126141A (en) * | 2019-12-31 | 2021-07-16 | 南京即衡科技发展有限公司 | Portable neutron and gamma ray dose measuring device |
| CN111999775B (en) * | 2020-08-06 | 2024-03-01 | 中国石油天然气集团有限公司 | Method for processing coincidence measurement energy spectrum |
| CN113109861A (en) * | 2021-04-12 | 2021-07-13 | 中国原子能科学研究院 | Radiation detection device and method thereof |
| CN114384578A (en) * | 2021-11-26 | 2022-04-22 | 西北核技术研究所 | Fast neutron and silicon reaction pair3Method for synchronously discriminating interference of He sandwich spectrometer |
| CN116736364B (en) * | 2023-05-12 | 2023-12-29 | 中国工程物理研究院材料研究所 | Neutron measurement system background count rate suppression system and suppression method |
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| CN102081166B (en) * | 2009-12-01 | 2013-03-27 | 同方威视技术股份有限公司 | Detection device and detection method for neutrons and gamma rays |
| CN201662623U (en) * | 2010-01-22 | 2010-12-01 | 上海新漫传感技术研究发展有限公司 | Portable neutron-gammarayspectrometer |
| JP6206948B2 (en) * | 2012-06-26 | 2017-10-04 | 大学共同利用機関法人 高エネルギー加速器研究機構 | Two-dimensional TOF pulse neutron detector |
| CN102736100B (en) * | 2012-07-13 | 2015-03-18 | 中国科学院合肥物质科学研究院 | Spherical multilayer polyethylene moderation body and neutron energy spectrum and fluence measurement device of single probe |
| CN102866416B (en) * | 2012-09-10 | 2015-06-17 | 中国科学院合肥物质科学研究院 | Continuous neutron spectrum real-time detection system |
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