CN107340533A - 3The proportional detector output amplitude compensation method of He Central spectrometers and device - Google Patents
3The proportional detector output amplitude compensation method of He Central spectrometers and device Download PDFInfo
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Abstract
The invention particularly relates to one kind3The proportional detector output amplitude compensation method of He Central spectrometers and device.Solves in the prior art the problem of proportional detector output amplitude is relevant with primary ionization position, reduces proportional detector measurement accuracy.Compensation device include measurement tank, radioactive source, support, proportional detector, U-type groove, semiconductor detector, when the width converter and spectrometers of Eagle 2000；Proportional detector is arranged in U-type groove, radioactive source is arranged on above U-type groove, and it is fixedly connected with U-type groove, semiconductor detector is arranged on below U-type groove, the position of U-type groove side wall top and bottom face radioactive source is respectively arranged with collimating aperture, proportional detector, U-type groove, radioactive source, semiconductor detector be respectively positioned on measurement tank body in, when width converter be connected respectively with proportional detector and semiconductor detector, the spectrometers of Eagle 2000 are connected with proportional detector.The present invention can effectively improve proportional detector measurement accuracy, so as to improve3He Central spectrometer energy resolutions.
Description
Technical field
The invention belongs to neutron spectrum measurement technical field, and in particular to one kind3He Central spectrometer proportional detectors are defeated
Go out amplitude compensation method and device.
Background technology
3He fast neutron Central spectrometer detectors core body uses proportional detector and two opposed semiconductor detectors, just
Than being filled in detector3He gases, concrete structure are as shown in Figure 1.3N-p nuclear reactions such as formula (1), nuclear reaction occur with neutron for He
Product (powered heavy ion) sedimentary energy first in proportional detector, finally respectively enters two semiconductor detectors and is visited
Survey,
3He+n→p+T+0.765MeV(1)
When three detectors produce output of pulse signal simultaneously (being once to meet event), it can just be registered as once
Effective n-p nuclear reactions.By measure neutron with3He generation n-p reactions meet event, can effectively screen neutron scattering, visit
Survey the non-influences for meeting event such as wall effect.
3Proportional detector rectangular cross-section used by He fast neutron Central spectrometers, size are 23mm × 21mm × 11mm,
Neutron with3He reaction region, and after nuclear reaction particle energy deposit detector, in theory proportional detector output width
Degree is unrelated with position caused by primary ionization, but because rectangle proportional detector Electric Field Distribution uniformity is poor, electronics Drift Process
It is middle to cause proportional detector output amplitude and primary ionization position to have certain relation by factors such as gas recombinations, so that direct ratio is visited
Surveying device energy measurement precision reduces.Experiment measurement confirms that proportional detector reality output amplitude has with primary ionization away from anodic wire distance
Close, have certain influence to energy measurement accuracy, it is necessary to which it is corrected for.
The content of the invention
For solution, proportional detector output amplitude is relevant with primary ionization position in the prior art, makes proportional detector measurement essence
The problem of degree reduces, the invention provides a kind of to proportional detector output amplitude amendment, improve3He Central spectrometers direct ratio detects
The method and device of device energy measurement precision.
Technical proposal that the invention solves the above-mentioned problems is：
3He Central spectrometer proportional detector output amplitude compensation methodes, comprise the following steps：
1) penalty coefficient is established
1.1) measuring apparatus is demarcated to establish
Proportional detector is placed in U-type groove, radioactive source is placed in above U-type groove and fixed with U-type groove, semiconductor detector
It is placed in below U-type groove, the position of U-type groove side wall face radioactive source is respectively arranged with collimating aperture, scale is provided with U-type groove side wall
Mark, proportional detector, U-type groove, radioactive source, semiconductor detector are respectively positioned in measurement tank；
1.2) nominal data measures
Working gas is filled in measurement tank, mobile U-type groove, realizes and proportional detector diverse location is irradiated, record irradiation
Position, proportional detector time delay, proportional detector output amplitude；
1.3) penalty coefficient is calculated
Particle trajectory is away from anode minimum range compensation method：According to radioactive source in proportional detector different irradiation positions with
Data are fitted to curve, obtained by proportional detector output amplitude, different irradiation positions and the relation of proportional detector time delay
To proportional detector time delay and the penalty coefficient η of proportional detector output amplitude relational expression：
Wherein：tdFor proportional detector time delay；
2)3The actual measurement of He Central spectrometers proportional detector：
2.1) neutron modal data is measured, obtains proportional detector output amplitude and its relative semiconductor detector output signal
Time delay；
2.2) according to penalty coefficient η, proportional detector output amplitude is compensated：
EG=Em/(1-η)
Wherein：EGFor direct ratio pulse amplitude after compensation；
EmTo measure pulse amplitude；
η is penalty coefficient.
Above-mentioned steps 1.3) in penalty coefficient also can by particle trajectory away from anode equivalent compensated distance method obtain：Profit
Simulated with Geant4 softwares3Meet event nuclear reaction products track in He Central spectrometer proportional detectors, determine particle trajectory away from
Track distribution probability corresponding to anodic wire minimum range, as shown in figure 14, according to track distribution probability calculate particle trajectory away from
Equivalent distances d corresponding to anode minimum rangee,
Wherein：
deFor equivalent distances；
dminFor by delay time measurement obtain away from anodic wire minimum range；
D is distance of each point away from anode on particle trajectory；
pdTo simulate the probability of different distance using Geant4 softwares；
According to radioactive source in proportional detector different irradiation positions and proportional detector output amplitude, different irradiation positions
With the relation of proportional detector time delay, data are fitted to curve using the equivalent distances, obtain proportional detector delay
Time and the penalty coefficient of proportional detector output amplitude,
Above-mentioned U-type groove is aluminium groove.
3He Central spectrometer proportional detector output amplitude compensation devices, including measurement tank, radioactive source, support, direct ratio detection
Device, U-type groove, semiconductor detector, when width converter and Eagle-2000 spectrometers；Proportional detector is arranged in U-type groove, radiation
Source is arranged on above U-type groove, and is fixedly connected by support with U-type groove, and semiconductor detector is arranged on below U-type groove, U-type groove
The position of side wall top and bottom face radioactive source is respectively arranged with collimating aperture, and scale marker, direct ratio detection are provided with U-type groove side wall
Device, U-type groove, radioactive source, semiconductor detector be respectively positioned on measurement tank body in, when width converter led respectively with proportional detector and partly
Bulk detector is connected, and Eagle-2000 spectrometers are connected with proportional detector.
Advantages of the present invention is：
1. the present invention measures proportional detector output delay, amplitude and primary ionization in advance by establishing special measurement device
Data away from anode distance, obtain proportional detector Amplitude Compensation relation and parameter.It is by measuring in actual spectral measurement
System meets proportional detector time delay in event, right3He Central spectrometer proportional detectors output amplitude compensates, and can effectively carry
High proportional detector measurement accuracy, so as to improve3He Central spectrometer energy resolutions.
2. the present invention determines nuclear reaction by measuring relative delay of the proportional detector relative to semiconductor detector
Charged particle is simulated away from proportional detector anode minimum range by Geant4 softwares3He Central spectrometers meet powered in event
Particle establishes proportional detector time delay and away from anode equivalent away from anode minimum range and the Charged Particle Trajectories regularity of distribution
Relation between distance, obtained particle trajectory can further improve compensation effect away from anode equivalent compensated distance method.
3. checking work is carried out using Xi'an Lintong plume thermal source, the results showed that using this method to Xi Anmai
Heap plume thermal neutron spectrum data are rushed to be corrected, thermal neutron peak width is down to 70keV or so (see Figure 13) by 140keV, from
And imitate and improve thermal neutron resolution ratio, it was demonstrated that this method can effectively improve proportional detector energy measurement precision.
Brief description of the drawings
Fig. 1 is the present invention3He fast neutron Central spectrometer schematic diagrams；
Fig. 2 is apparatus of the present invention structural side view；
Fig. 3 is apparatus of the present invention structure top view；
Fig. 4 is U-type groove scale marker schematic diagram of the present invention；
Fig. 5 is measuring system electronics of the present invention composition figure；
Fig. 6 is graph of a relation of the curring time of the present invention to output signal differentia influence；
Fig. 7 is output amplitude of the present invention and primary ionization location diagram；
Fig. 8 is proportional detector time delay of the present invention and primary ionization location diagram；
Fig. 9 is for the present invention using particle trajectory away from anode minimum range compensation method proportional detector time delay and amplitude
Compensation relationship figure；
Figure 10 is particle trajectory schematic diagram in detector of the present invention；
Figure 11 is that the present invention meets event trace distribution probability figure；
Figure 12 is that thermal neutron of the embodiment of the present invention measures electronic system figure；
Figure 13 is that the present invention meets thermal neutron spectrogram；
Figure 14 is distributed to meet event minimum range.
Reference：11- semiconductor detectors, 12- proportional detectors；
1- measurement tanks, 2- radioactive sources, 3- supports, 4- proportional detector anodes, 5- proportional detectors, 6-U type grooves, 7- are partly led
Bulk detector.
Embodiment
Present disclosure is described in further detail below in conjunction with the drawings and specific embodiments：
Because distance of the primary ionization away from anode can influence proportional detector output amplitude in proportional detector, the present invention is by setting
Compensation device is put, it is defeated to measure primary ionization position in proportional detector, proportional detector time delay and proportional detector in advance
Go out amplitude, establish the compensation relationship of proportional detector time delay and output amplitude.Measurement can be passed through in actual spectral measurement
Proportional detector time delay is obtained, analyzes the approximate location and amplitude correction amount of primary ionization, so as to defeated to proportional detector
Go out amplitude to be corrected, improve energy measurement precision.
3He Central spectrometer proportional detector output amplitudes compensation device includes measurement tank 1, radioactive source 2, support 3, direct ratio and visited
Survey device 5, U-type groove 6, semiconductor detector 7, when width converter and Eagle-2000 spectrometers；Proportional detector 5 is arranged on U-type groove 6
Interior, radioactive source 2 is arranged on the top of U-type groove 6, and is fixedly connected by support 3 with U-type groove 6, and semiconductor detector 7 is arranged on U-shaped
The lower section of groove 6, the position of the side wall top and bottom face radioactive source 2 of U-type groove 6 is respectively arranged with collimating aperture, is provided with the side wall of U-type groove 6
Scale marker, proportional detector 5, U-type groove 6, radioactive source 2, semiconductor detector 7 be respectively positioned on measurement the body of tank 1 in, when width converter
It is connected respectively with proportional detector 5 and semiconductor detector 7, Eagle-2000 spectrometers are connected with proportional detector 5.
3He Central spectrometer proportional detector output amplitude compensation methodes, comprise the following steps：
1) penalty coefficient is established
1.1) measuring apparatus is demarcated to establish
As shown in Fig. 2 by measurement tank 1, proportional detector 5, semiconductor detector 7 and one piece241The composition demarcation of Am radioactive sources
Equipment, utilize241Am 5.486MeV α particles carry out the measurement of proportional detector energy deposition and output amplitude relation.By direct ratio
Detector 5 is placed in U-type groove 6, and radioactive source α particles are placed in the top of U-type groove 6, and semiconductor detector 7 is placed in the lower section of U-type groove 6, U-shaped
The position of the side wall face radioactive source α particles of groove 6 is respectively arranged with diameter 0.5mm collimating apertures；α particles be placed in directly over collimating aperture away from
20~the 30mm of sidewall surfaces of U-type groove 6, and be fixedly connected by support 3 with U-type groove 6, it is provided with graduated scale in the side wall of U-type groove 6
Know, proportional detector 5, U-type groove 6, radioactive source 2, semiconductor detector 7 are respectively positioned in measurement tank 1, are provided by measurement tank 1 required
Working environment, U-type groove is aluminium groove.
As shown in Figure 3, Figure 4, α particles are got on semiconductor detector 7 through two collimating apertures, and the high scale of U-type groove 6 can be true
Determine irradiation position of the α particles in proportional detector 5, due to α particles from during diverse location incidence in proportional detector 5 range
It is identical, therefore the energy of deposition is identical in proportional detector 5.By measuring α particles from proportional detector during diverse location incidence
Output amplitude, the diverse location energy response difference of proportional detector 5 can be compared.By proportional detector and semiconductor detector arteries and veins
Signal is rushed after constant fraction discriminator circuit, during input width converter it is measurable go out proportional detector signal prolonging relative to semiconductor
The slow time (i.e. proportional detector time delay).
Electronic system is measured as shown in figure 5, two sets of Eagle-2000 spectrometers measure proportional detector output amplitude respectively
And proportional detector is composed with respect to the signal delay of semiconductor detector, with the 996 scaler monitoring work shape of semiconductor detector 7
State, using realizing proportional detector 5 and the arteries and veins of semiconductor detector 7 along constant fraction discriminator output function after the 50% of 551 timing single tracks
Signal constant fraction discriminator is rushed, avoids the Time walk problem caused by signal amplitude difference, when improving proportional detector delay
Between the accuracy that measures.
1.2) nominal data measures
Working gas is filled in measurement tank 1, mobile U-type groove 6, realizes and the diverse location of proportional detector 5 is irradiated, record shines
Penetrate position, proportional detector time delay, proportional detector output amplitude.Due to3He gases costly, use4He gas generations
Replace3He gases carry out this test.
Proportional detector amplifier curring time：Influence of the measuring amplifier curring time to output amplitude first.Shaping
It is respectively 0.5 μ s, 1 μ s, 2 μ s, 3 μ, 6 μ s that time, which is set, measures output amplitude maximum relative mistake on anodic wire radial direction 0mm positions
Δ is defined as, as shown in formula (6), wherein V10、V0Respectively α particles are by direct ratio when radial direction 0mm and radial direction 10mm collimating aperture incidences
Detector output amplitude,
Fig. 6 is the relation of output amplitude maximum relative mistake and main amplifier curring time, it can be seen that when main amplifier shapes
Between select 2 μ s more reasonable.
Primary ionization position measures with output amplitude and time delay relation：It is 2 μ s to set main amplifier curring time, just
0mm, 4mm, 8mm opening position more axial than detector 5, carry out proportional detector output amplitude, proportional detector time delay with away from
The measurement of anodic wire axial distance change.Output amplitude is with primary ionization position relationship as shown in fig. 7, proportional detector time delay
It is as shown in Figure 8 with anodic wire distance relation.As seen from Figure 7 proportional detector output amplitude with away from anodic wire radial distance increase by
Gradually reduce.The output amplitude difference unobvious when axial location is smaller, due to the influence of the end effect of proportional detector 5, in axial direction
(close to proportional detector cathode section side wall) when position is larger, slightly reduced when output amplitude can be smaller than axial location, but far
Less than output amplitude difference caused by radial distance.For this each radial position average value can be used to represent output amplitude and away from sun
The relation of polar filament radial distance.The delay of the output signal of proportional detector 5 is basic only with primary ionization away from anode string diameter as seen from Figure 8
It is little with anodic wire axial distance relation to distance dependent.Therefore, can be according to time delay to proportional detector output amplitude
It is modified.
By measuring time delay of the proportional detector 5 relative to semiconductor detector 7, the position that primary ionization occurs is determined
Put.According to the diverse location actual energy of proportional detector 5 response determined and proportional detector time delay, direct ratio spy is established
Survey device time delay and the relation of signal amplitude compensation.
1.3) penalty coefficient calculates
Penalty coefficient can by particle trajectory away from the compensation method of anode minimum range or particle trajectory away from anode equivalent distance
Compensation method obtains；
1.3.1) particle trajectory is away from anode minimum range compensation method：
It is defeated according to different irradiation positions in the proportional detector 5 measured and proportional detector output amplitude and proportional detector
Go out the data of signal delay time, proportional detector time delay and the relation of signal amplitude compensation can be established, data are fitted
Into curve, and obtain the relational expression of proportional detector time delay and proportional detector output amplitude penalty coefficient η：
Wherein：tdFor proportional detector time delay；
1.3.2) particle trajectory is away from anode equivalent compensated distance method：
In practice during sub- spectral measurement, the nuclear reaction products for meeting event exists3Mostly compare track in He gases
More random, it is different that the α particle trajectories in being tested from research background are all perpendicular to anodic wire, as shown in figure 9, α particle trajectories arrive
Anodic wire vertical range is l, is utilized3The period of the day from 11 p.m. to 1 a.m in the measurement of He fast neutrons Central spectrometer, proportional detector are corresponding to time delay
Track is away from anodic wire minimum range dmin, represented with minimum range meet event nuclear reaction products track and actual conditions also have compared with
Big difference.Particle position directly is calculated using energy response and proportional detector time delay relation for this, and then direct ratio is visited
It is necessarily not good enough that survey device output amplitude compensates effect.
Because proportional detector time delay is related away from the minimum range of proportional detector anode 4 to particle trajectory, utilize
Geant4 softwares, which can simulate, meets event nuclear reaction products in proportional detector 5, determine particle trajectory away from anodic wire most narrow spacing
From corresponding track distribution probability, as shown in Figure 10, as can be seen from Figure away from anodic wire minimum range it is smaller when, track distribution probability
Curve is wider, and with increasing away from anodic wire minimum range, distribution curve substantially narrows.As shown in figure 14, it is distributed according to track general
Rate can calculate corresponding equivalent distances under every kind of probability, computational methods such as formula (3), wherein deFor equivalent distances, dminIt is logical
Cross that delay time measurement obtains away from anodic wire minimum range, d is away from anodic wire distance, pdTo be calculated using Geant4 softwares
The probability for being d away from anodic wire distance arrived,
Because each point also differs apart from anode distance on scale α particles, therefore scale α particles are also needed to do same etc.
Effect distance processing, as shown in formula (4)：
Wherein：leFor α Particles Movings path equivalent distances,
N is α Particles Movings path isodisperse,
L be α Particles Movings path away from anodic wire minimum range,
H is the half thickness of proportional detector 5；
The equivalent distances relation for utilizing (3) signal compensation relation obtained by calibrating and (4) formula to obtain, is carried out to measurement data
Processing, complete the compensation of the data signal amplitude of proportional detector 5.Simulated using Geant4 softwares and meet nuclear reaction products in event
Track distribution probability, the equivalent distances corresponding to the different delays time are calculated, and propose that carrying out amplitude based on equivalent distances mends
The method repaid, fit corresponding compensation formula.Amplitude Compensation formula is same α Particles Movings path away from proportional detector anode 4
Minimum range can be thus bridge by primary ionization position by its associated with scale ray equivalent distances formula to association
Beam, establish proportional detector amplitude output signal compensation and time delay relation.Data are fitted again using the equivalent distances
Into curve, the penalty coefficient of proportional detector time delay and amplitude output signal is obtained,
2)3The actual measurement of He Central spectrometers proportional detector, is compensated to proportional detector output amplitude；
2.1) utilize3He Central spectrometers measure neutron field power spectrum, neutron modal data are measured, by meeting system acquisition data
And judge to meet event, obtain and meet proportional detector output amplitude and its prolonging with respect to the signal of semiconductor detector 7 in event
The slow time；
2.2) according to penalty coefficient, proportional detector output amplitude is compensated：
EG=Em/(1-η) (7)
Wherein：
EGFor direct ratio pulse amplitude after compensation；
EmTo measure pulse amplitude；
η is penalty coefficient.
3) proportional detector Amplitude Compensation is verified
In order to confirm the feasibility using time delay correction proportional detector output amplitude method, Xi'an Lintong is utilized
Plume carries out energy compensating checking work.Xi'an Lintong plume can produce slowing down it is good hanker subfield, export beam spot diameter,
35mm, thermal neutron line is uniform in beam spot, can cover whole3He fast neutron Central spectrometers sensitive volume.Spectrometer system measurement meets
Event energy should be thermal neutron with3He reactions can 765keV.
Figure 12 is detector electronic system figure, is divided into two-way per road amplifier output of pulse signal, delayed all the way
Amplification enters linear gate, and another way enters 551 timing single tracks, prolongs 50% constant fraction discriminator signal after producing pulse, for linear gate
Open the door.The signal so exported by linear gate has constant fraction discriminator forward position.Signal calibration direct ratio is produced using 419 signal generators
The relative delay of detector 5, make its measuring method in being tested with basic research consistent.Meet system using three-channel digital
Acquisition pulse signal amplitude and timing information, 551 timing single track threshold values are set and cross threshold point voltage higher than AD, triple channel can be achieved
Digit syzygy is united to signal constant fraction discriminator.Figure 11 meets signal for what oscillograph obtained, it can be seen that three road pulse signals all pass through
Crossing constant proportion processing of circuit has constant proportion forward position.Figure 12 is that semiconductor detector 7 measures nuclear reaction products power spectrum, has high energy in power spectrum
Proton (574keV) and two independent peaks of low energy tritium (191keV).Figure 13 is using pulse amplitude and temporal information, is passed through
Meet and screen the thermal neutron spectrum that software obtains, proportional detector output amplitude is repaiied using two methods as can be seen from Figure
After just, measurement thermal neutron peak substantially narrows, peak value uprises.After being modified especially with equivalent distances method, peak shape high energy
Along obvious steepening, the more non-timing of peak value, which improves 30%, peak width, reduces by 50% or so.Illustrate to visit direct ratio using this method
The compensation of device output amplitude is surveyed, proportional detector measurement energy accuracy can be effectively improved.
Demonstrated by testing measurement3He proportional detectors export energy response has certain pass with primary ionization with anode distance
System.Using 241Am α particle sources finely measure proportional detector main amplifier curring time be 2 μ s under the conditions of, primary ionization away from
The parameters such as the time delay of anode distance, output of pulse signal amplitude, proportional detector and semiconductor detector signal are mutually closed
System；Simulated using Geant4 softwares and meet time and track distribution probability, it is proposed that equivalent distances proportional detector exports width
Spend modification method.Xi'an Lintong plume thermal neutron spectrum data are corrected using this method, thermal neutron can be effectively improved
Resolution ratio, this method can effectively improve proportional detector energy measurement precision.
Claims (5)
1.3He Central spectrometer proportional detector output amplitude compensation methodes, it is characterised in that comprise the following steps：
1) penalty coefficient is established
1.1) measuring apparatus is demarcated to establish
Proportional detector is placed in U-type groove, radioactive source is placed in above U-type groove and fixed with U-type groove, and semiconductor detector is placed in
Below U-type groove, the position of U-type groove side wall face radioactive source is respectively arranged with collimating aperture, graduated scale is provided with U-type groove side wall
Know, proportional detector, U-type groove, radioactive source, semiconductor detector are respectively positioned in measurement tank；
1.2) nominal data measures
Working gas is filled in measurement tank, mobile U-type groove, realizes and proportional detector diverse location is irradiated, record irradiation position,
Proportional detector time delay, proportional detector output amplitude；
1.3) penalty coefficient is calculated
Particle trajectory is away from anode minimum range compensation method：According to radioactive source in proportional detector different irradiation positions and direct ratio
Data are fitted to curve, obtained just by detector output amplitude, different irradiation positions and the relation of proportional detector time delay
Than detector delays time and proportional detector output amplitude penalty coefficient η relational expression：
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<mi>&eta;</mi>
<mo>=</mo>
<mo>-</mo>
<mn>0.01048</mn>
<mo>+</mo>
<mn>9.361</mn>
<mo>&times;</mo>
<msup>
<mn>10</mn>
<mrow>
<mo>-</mo>
<mn>5</mn>
</mrow>
</msup>
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<mi>t</mi>
<mi>d</mi>
</msub>
<mo>-</mo>
<mn>3.292</mn>
<mo>&times;</mo>
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<mn>10</mn>
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<mn>9</mn>
</mrow>
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<msubsup>
<mi>t</mi>
<mi>d</mi>
<mn>2</mn>
</msubsup>
<mo>;</mo>
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Wherein：tdFor proportional detector time delay；
2)3The actual measurement of He Central spectrometers proportional detector：
2.1) neutron modal data is measured, obtains proportional detector output amplitude and proportional detector time delay；
2.2) according to penalty coefficient η, proportional detector output amplitude is compensated：
EG=Em/(1-η)
Wherein：EGFor direct ratio pulse amplitude after compensation；
EmTo measure pulse amplitude；
η is penalty coefficient.
It is 2. according to claim 13He Central spectrometer proportional detector output amplitude compensation methodes, it is characterised in that：It is described
U-type groove is aluminium groove.
3.3He Central spectrometer proportional detector output amplitude compensation methodes, it is characterised in that：Comprise the following steps：
1) penalty coefficient is established
1.1) measuring apparatus is demarcated to establish
Proportional detector is placed in U-type groove, radioactive source is placed in above U-type groove and fixed with U-type groove, and semiconductor detector is placed in
Below U-type groove, the position of U-type groove side wall face radioactive source is respectively arranged with collimating aperture, graduated scale is provided with U-type groove side wall
Know, proportional detector, U-type groove, radioactive source, semiconductor detector are respectively positioned in measurement tank；
1.2) nominal data measures
Working gas is filled in measurement tank, mobile U-type groove, realizes and proportional detector diverse location is irradiated, record irradiation position,
Proportional detector time delay, proportional detector output amplitude；
1.3) penalty coefficient is calculated
Particle trajectory is away from anode equivalent compensated distance method：Simulated using Geant4 softwares3Accorded with He Central spectrometers proportional detector
Conjunction event nuclear reaction products track, particle trajectory is determined away from track distribution probability corresponding to anodic wire minimum range, according to track
Distribution probability calculates particle trajectory away from equivalent distances d corresponding to anode minimum rangee,
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<msub>
<mi>d</mi>
<mi>e</mi>
</msub>
<mo>=</mo>
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</msub>
</munder>
<msub>
<mi>p</mi>
<mi>d</mi>
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<mi>d</mi>
</mrow>
1
Wherein：
deFor equivalent distances；
dminFor by delay time measurement obtain away from anodic wire minimum range；
D is distance of each point away from anode on particle trajectory；
pdTo simulate the probability of different distance using Geant4 softwares；
According to radioactive source in proportional detector different irradiation positions and proportional detector output amplitude, different irradiation positions with just
Than the relation of detector delays time, data are fitted to curve using the equivalent distances, obtain proportional detector time delay
With the penalty coefficient of proportional detector output amplitude,
<mrow>
<mi>&eta;</mi>
<mo>=</mo>
<mo>-</mo>
<mn>5.08</mn>
<mo>&times;</mo>
<msup>
<mn>10</mn>
<mrow>
<mo>-</mo>
<mn>5</mn>
</mrow>
</msup>
<mo>+</mo>
<mn>9.88</mn>
<mo>&times;</mo>
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<mn>10</mn>
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<mn>5</mn>
</mrow>
</msup>
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<mn>2.51</mn>
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<mn>8</mn>
</mrow>
</msup>
<msubsup>
<mi>t</mi>
<mi>d</mi>
<mn>2</mn>
</msubsup>
<mo>+</mo>
<mn>2.95</mn>
<mo>&times;</mo>
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<mn>10</mn>
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<mn>12</mn>
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2)3The actual measurement of He Central spectrometers proportional detector：
2.1) neutron modal data is measured, obtains proportional detector output amplitude and proportional detector time delay；
2.2) according to penalty coefficient η, proportional detector output amplitude is compensated：
EG=Em/(1-η)
Wherein：
EGFor direct ratio pulse amplitude after compensation；
EmTo measure pulse amplitude；
η is penalty coefficient.
It is 4. according to claim 33He Central spectrometer proportional detector output amplitude compensation methodes, it is characterised in that：It is described
U-type groove is aluminium groove.
5.3He Central spectrometer proportional detector output amplitude compensation devices, it is characterised in that：Including measurement tank, radioactive source, support,
Proportional detector, U-type groove, semiconductor detector, when width converter and Eagle-2000 spectrometers；
The proportional detector is arranged in U-type groove, and radioactive source is arranged on above U-type groove, and is fixed and connected by support and U-type groove
Connect, semiconductor detector is arranged on below U-type groove, and the position of U-type groove side wall top and bottom face radioactive source is respectively arranged with collimation
Hole, scale marker is provided with U-type groove side wall, proportional detector, U-type groove, radioactive source, semiconductor detector are respectively positioned on measurement tank
In vivo, width converter is connected with proportional detector and semiconductor detector respectively when, Eagle-2000 spectrometers and proportional detector
Connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710552439.9A CN107340533B (en) | 2017-07-07 | 2017-07-07 | The proportional detector output amplitude compensation method of 3He Central spectrometer and device |
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| CN108152853A (en) * | 2018-03-08 | 2018-06-12 | 北京聚合信机电有限公司 | Counting tube energy compensation system |
| CN110082376A (en) * | 2019-05-20 | 2019-08-02 | 中国人民大学 | A kind of biserial monocrystalline neutron analyzer module |
| CN114518589A (en) * | 2022-01-28 | 2022-05-20 | 西北核技术研究所 | Method for realizing energy calibration of gas proportional detector based on thick radioactive source |
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