CN102830420A - Method and system for calibrating working voltage of nuclear radiation detector - Google Patents
Method and system for calibrating working voltage of nuclear radiation detector Download PDFInfo
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- CN102830420A CN102830420A CN2012103208799A CN201210320879A CN102830420A CN 102830420 A CN102830420 A CN 102830420A CN 2012103208799 A CN2012103208799 A CN 2012103208799A CN 201210320879 A CN201210320879 A CN 201210320879A CN 102830420 A CN102830420 A CN 102830420A
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Abstract
The invention belongs to the technical field of nuclear radiation measurement, and in particular relates to a method and a system for calibrating a working voltage of a nuclear radiation detector. The method comprises the following steps of: on the basis of obtaining a pulse magnitude spectrum, determining a time constant of a main amplifier firstly, determining a best working voltage of the nuclear radiation detector under the time constant, and determining an amplification factor of the amplifier and a threshold of a discriminator under the best working voltage of the detector; and measuring a plateau curve under the condition of constant parameters, such as the threshold of the discriminator, the amplification factor of the amplifier, the time constant and the like, and determining influence of high-voltage fluctuation on measuring data through computing a plateau slope. The method and the system, provided by the invention, are beneficial for prolonging the service life of the detector, improving inhibition capacity of a gamma signal, reducing high-voltage electric discharge phenomena and avoiding a condition of incapability of measuring the plateau curve due to random setting of the parameters.
Description
Technical field
The invention belongs to the nuclear radiation measurement technical field, be specifically related to a kind of nuclear radiation detector WV scaling method and system.
Background technology
The nuclear radiation ionization meter is one of routine work that relates to the nuclear area research, and the measuring system hardware configuration is as shown in Figure 1.Nuclear radiation detector converts nuclear signal to electric signal and supplies follow-up nuclear electronics system handles, and nuclear radiation detector must plus high-pressure ability operate as normal.As shown in Figure 1, high-voltage power supply is transferred on the nuclear radiation detector through prime amplifier.The high pressure size influences nuclear radiation detector real work performance, must pass through experimental calibration.It is to confirm its optimum operating voltage on the one hand that the nuclear radiation detector WV is demarcated, and is to confirm the influence of high pressure fluctuations to measurement data on the other hand.The plateau curve assay method is traditional nuclear radiation detector WV scaling method, and its hardware configuration is as shown in Figure 2.Under the condition of parameter constants such as discriminator threshold value, amplifier magnification ratio, time constant; Regulate the detector impressed voltage from small to large after loading radiation source; Read counting rate (or fixation measuring time counting) through scaler, the curve that meter digit rate (or fixation measuring time counting) changes with impressed voltage.Recording on the counting curve has tangible counting Ping Qu, thus be called plateau curve, as shown in Figure 3.Optimum operating voltage is located in the level ground, position shown in the downward arrow of Fig. 3.Counting Ping Qu in fact counting rate (or fixation measuring time counting) still raise and increase with WV, showing the level ground has the gradient, is called plateau slope, the number percent that counting rate (or fixation measuring time counting) increases when referring to every rising 100V, its computing formula is:
V and N be representative voltage value and count value respectively, and plateau slope characterizes the relative variation that high pressure fluctuations causes counting rate (or fixation measuring time counting), and the more little sign high pressure fluctuations of plateau slope is more little to the influence of measurement data, otherwise big more.
The plateau curve measurement is under the constant condition of discriminator threshold value, amplifier magnification ratio, time constant, to carry out, and the WV that plateau curve is confirmed is the optimum operating voltage of (parameters such as discriminator threshold value, amplifier magnification ratio, time constant immobilize) detector under the work at present condition.Various types of nuclear radiation detector WVs all have an interval, if discriminator threshold value, amplifier magnification ratio, time constant are selected suitablely can measure plateau curve, the optimum operating voltage that plateau curve is confirmed drops in this interval.In fact discriminator threshold value and amplifier magnification ratio are measured influence greatly to plateau curve, and the plateau curve of different discriminator threshold values and amplifier magnification ratio measurement gained is also inequality, and the WV of confirming is also inequality.If it is improper even can not measure plateau curve that discriminator threshold value and amplifier magnification ratio are selected, confirmed not optimum operating voltage.And the selection of discriminator threshold value, amplifier magnification ratio, time constant does not have a cover reasonable method, has very big randomness.
Because any point can both satisfy measurement requirement in the detector WV interval; And low-work voltage helps to prolong detector serviceable life; Improve γ signal suppressing ability, reduce the effluve phenomenon, therefore optimum operating voltage of the present invention is the interval lower limit of detector WV.In order to record the interval lower limit of detector WV, need to reject discriminator threshold value, amplifier magnification ratio, the influence of time constant to measuring, traditional plateau curve assay method can not meet the demands.
Summary of the invention
The objective of the invention is to defective to prior art; A kind of nuclear radiation detector WV scaling method and system based on pulse amplitude spectrum is provided; This method is under the time constant of confirming, amplifier magnification ratio, discriminator threshold condition; Measure plateau curve, avoided parameter that the situation that survey does not go out plateau curve arbitrarily is set.
Technical scheme of the present invention is following: a kind of nuclear radiation detector WV scaling method comprises the steps:
(1) with the plus high-pressure of nuclear radiation detector transfer in the WV interval of estimation more arbitrarily; Measure the pulse amplitude spectrum of the main amplifier output that is connected with nuclear radiation detector through multichannel pulse scope-analyzer; The horizontal ordinate of said pulse amplitude spectrum is the road number of multichannel pulse scope-analyzer, and ordinate is the counting of multichannel pulse scope-analyzer;
(2) little, the integration time constant of adjusting main amplifier, the time constant that strobe pulse amplitude spectrum intermediate-resolution is high, resolution=main peak halfwidth/location, main peak road;
(3) under the selected time constant of step (2), the optimum operating voltage of definite kernel radiation detector, described optimum operating voltage are the interval lower limit of nuclear radiation detector WV, and confirm the big device enlargement factor of master under optimum operating voltage;
(4) measure the discriminator optimal threshold according to the corresponding pulse amplitude spectrum of the optimum operating voltage that records and with the discriminator threshold value adjustment to this optimum value;
(5) under discriminator threshold value, amplifier magnification ratio, the changeless situation of time constant, load radiation source and measure plateau curve, confirm the influence of high pressure fluctuations through calculating plateau slope to measurement data.
Further, aforesaid nuclear radiation detector WV scaling method in the step (2), when regulating little, the integration time constant of main amplifier, uses oscillograph to observe the shape of main amplifier output pulse, guarantees that its peak shape does not distort.
Further, aforesaid nuclear radiation detector WV scaling method in the step (2), under the identical situation of pulse amplitude spectrum intermediate-resolution, is selected relatively little time constant.
Further; Aforesaid nuclear radiation detector WV scaling method, in the step (3), the method for the optimum operating voltage of definite kernel radiation detector is: under the situation that loads radiation source; The plus high-pressure of nuclear radiation detector is regulated from small to large; Measure the pulse amplitude spectrum of main amplifier output, thereby regulate the width that the main amplifier enlargement factor changes pulse amplitude spectrum, pulse amplitude spectrum is transferred to till the counting paddy that certain width occurs; Reach the requirement that nuclear signal and noise signal are screened, described counting paddy is meant one section zone that counting is lower between the nuclear signal and noise signal in the pulse amplitude spectrum.
Further; Aforesaid nuclear radiation detector WV scaling method; In the step (4), the method for measuring the discriminator optimal threshold is: in said pulse amplitude spectrum, confirm pairing some M of discrimination threshold, said M point is positioned at the counting paddy the lowest point of pulse amplitude spectrum; M ' the substitution location, multichannel pulse scope-analyzer road, location, horizontal ordinate road and the magnitude of voltage transformation for mula A=pm+A of the multichannel pulse scope-analyzer that discrimination threshold M point is corresponding
0, obtain optimal threshold A ', wherein, m is the location, and A is the m corresponding voltage value, and p is a coefficient, A
0Be constant.
Further; Aforesaid nuclear radiation detector WV scaling method; In the step (4), be: use signal generator to import square-wave pulse signal, use oscillograph to observe main amplifier output to main amplifier with the method for discriminator threshold value adjustment to optimum value; Regulate the square-wave pulse signal amplitude, making the main amplifier output amplitude is the pulse signal of A '; Use oscillograph to observe the output of the discriminator that is connected with main amplifier, the threshold value of discriminator is regulated from small to large, till discriminator did not just have pulse signal output, this moment, the actual threshold of discriminator was adjusted to optimal threshold A '.
Further; Aforesaid nuclear radiation detector WV scaling method; In the step (5); The method of measuring plateau curve is: regulate the nuclear radiation detector plus high-pressure from small to large after loading radiation source, read counting rate or fixation measuring time counting through scaler, the curve that meter digit rate or fixation measuring time counting change with the nuclear radiation detector plus high-pressure.
A kind of nuclear radiation detector WV calibration system; Comprise that time constant confirms that device, optimum operating voltage confirm device, discriminator threshold value adjustment device, plateau curve determinator; Wherein, described time constant confirms that device and optimum operating voltage confirm that device adopts identical hardware configuration, comprises nuclear radiation detector; Nuclear radiation detector connects prime amplifier and main amplifier in order; High-voltage power supply is transferred on the nuclear radiation detector through prime amplifier, and main amplifier is connected with multichannel pulse scope-analyzer, and multichannel pulse scope-analyzer connects computing machine; Described discriminator threshold value adjustment device comprises signal generator, and signal generator is connected with main amplifier, and main amplifier connects amplitude discriminator and oscillograph respectively, and amplitude discriminator is connected with oscillograph; Described plateau curve determinator comprises nuclear radiation detector; Nuclear radiation detector connects prime amplifier and main amplifier in order; High-voltage power supply is transferred on the nuclear radiation detector through prime amplifier, and main amplifier is connected with amplitude discriminator, and amplitude discriminator connects scaler.
Further, aforesaid nuclear radiation detector WV calibration system, wherein, described time constant confirms that the main amplifier of device also is connected with oscillograph.
Beneficial effect of the present invention is following: the present invention is based on the demarcation that the pulse amplitude spectrum assay method carries out the nuclear radiation detector WV; Plateau curve assay method than prior art; The selection of time constant, amplifier magnification ratio, discriminator threshold value no longer is random, and the pulse amplitude spectrum assay method provides a cover complete method for these parameters of choice.The nuclear radiation detector optimum operating voltage that the pulse height spectral method is confirmed is the interval lower limit of detector WV; It is the minimum that detector can operate as normal; The detector optimum operating voltage of confirming than plateau curve assay method is little; Low-work voltage helps to prolong detector serviceable life, improves γ signal suppressing ability, reduces the effluve phenomenon.Under the time constant of using the pulse amplitude spectrum assay method to confirm, amplifier magnification ratio, discriminator threshold condition, measure plateau curve, avoided parameter that the situation that survey does not go out plateau curve arbitrarily is set.
Description of drawings
Fig. 1 is a nuclear radiation strength measurement system hardware configuration synoptic diagram;
Fig. 2 is a plateau curve assay method hardware configuration synoptic diagram;
Fig. 3 is the plateau curve synoptic diagram;
Fig. 4 is a method flow diagram of the present invention;
Fig. 5 confirms the hardware configuration synoptic diagram of time constant for the present invention;
Fig. 6 confirms the hardware configuration synoptic diagram of detector optimum operating voltage for the present invention;
Fig. 7 is a discriminator threshold value adjustment hardware configuration synoptic diagram of the present invention;
Fig. 8 is the pulse amplitude spectrum synoptic diagram;
Fig. 9 is among the embodiment during impressed voltage 1150V
3He proportional counter tube pulse amplitude spectrum;
(a) little, each 4 μ s of integration of main amplifier, (b) main amplifier integration 2 μ s, differential 4 μ s;
Figure 10 is among the embodiment under the different impressed voltages
3The pulse amplitude spectrum of He proportional counter tube;
(a)1150V，(b)1250V；
Figure 11 is identical two plateau curves that record of different other experiment conditions (enlargement factor, time constant etc.) of discriminator threshold value among the embodiment; (a) 0.46V, (b) 1.46V.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is carried out detailed description.
The hardware configuration of nuclear radiation detector WV calibration system provided by the present invention comprises that time constant confirms that device, optimum operating voltage confirm device, discriminator threshold value adjustment device, plateau curve determinator; Wherein, Described time constant confirms that the structure of device is as shown in Figure 5; Optimum operating voltage confirms that the structure of device is as shown in Figure 6, and two devices adopt essentially identical hardware configuration, comprise nuclear radiation detector; Nuclear radiation detector connects prime amplifier and main amplifier in order; High-voltage power supply is transferred on the nuclear radiation detector through prime amplifier, and main amplifier is connected with multichannel pulse scope-analyzer, and multichannel pulse scope-analyzer connects computing machine.Time constant confirms that the main amplifier of device also is connected with oscillograph, through the shape that oscillograph is observed main amplifier output pulse, guarantees that its peak shape does not distort.
The structure of described discriminator threshold value adjustment device is as shown in Figure 7, comprises signal generator, and signal generator is connected with main amplifier, and main amplifier connects amplitude discriminator and oscillograph respectively, and amplitude discriminator is connected with oscillograph.
Described plateau curve determinator is as shown in Figure 2; Comprise nuclear radiation detector, nuclear radiation detector connects prime amplifier and main amplifier in order, and high-voltage power supply is transferred on the nuclear radiation detector through prime amplifier; Main amplifier is connected with amplitude discriminator, and amplitude discriminator connects scaler.
As shown in Figure 4; Nuclear radiation detector WV scaling method provided by the present invention; On the basis that obtains pulse amplitude spectrum; At first confirm the main amplifier time constant, confirm nuclear radiation detector optimum operating voltage under this time constant then, confirm amplifier magnification ratio and discriminator threshold value under this detector optimum operating voltage then.(parameters such as discriminator threshold value, amplifier magnification ratio, time constant immobilize) measured plateau curve under this condition, confirms the influence of high pressure fluctuations to measurement data through calculating plateau slope.Specifically comprise the steps:
(1) because nuclear radiation detector WV interval of the same type is can difference too not big; The plus high-pressure of nuclear radiation detector is transferred in the WV interval of estimation more arbitrarily; Measure the pulse amplitude spectrum of the main amplifier output that is connected with nuclear radiation detector through multichannel pulse scope-analyzer; As shown in Figure 8, the horizontal ordinate of said pulse amplitude spectrum is the road number of multichannel pulse scope-analyzer, and ordinate is the counting of multichannel pulse scope-analyzer.
(2) little, the integration time constant of adjusting main amplifier, the time constant that strobe pulse amplitude spectrum intermediate-resolution is high, resolution=main peak halfwidth/location, main peak road, hardware configuration is as shown in Figure 5; During the pulse height spectrometry, also need use oscillograph to observe the shape of main amplifier output pulse, guarantee that it does not distort; To same nuclear radiation detector, because the big more main amplifier of time constant output pulse is wide more, the counting loss rate is high more, thus under identical pulse amplitude spectrum resolution prerequisite in order to reduce the counting loss rate, constant between selecting hour.
(3) under the selected time constant of step (2), the optimum operating voltage of definite kernel radiation detector, hardware configuration is as shown in Figure 6; Method is to load radiation source; High pressure is regulated from small to large (starting point according to the general voltage-regulation of practical experience is 100V; Certainly also can transfer from 0V), measure main amplifier output pulse amplitude spectrum, regulate the main amplifier enlargement factor pulse amplitude spectrum is transferred to suitable width; The counting paddy (reaching the requirement that nuclear signal and noise signal are screened) that certain width is arranged as shown in Figure 8 appears up to pulse amplitude spectrum; Described counting paddy is meant one section zone that counting is lower between the nuclear signal and noise signal in the pulse amplitude spectrum, and counting paddy width can be that main amplifier output pulse amplitude spectrum covers 1/10 of multiple tracks interval width, and the impressed voltage of this moment is exactly the detector optimum operating voltage; Also be the interval lower limit of detector WV, the amplifier magnification ratio of this moment is exactly an amplifier magnification ratio under the optimum operating voltage.
(4) according to the pulse amplitude spectrum that records (main amplifier enlargement factor, time constant immobilize, the pulse amplitude spectrum that optimum operating voltage is corresponding) discriminator optimal threshold and with the discriminator threshold value adjustment to this optimum value.Record pulse amplitude spectrum as shown in Figure 8, nuclear signal is positioned at the right side of spectrum, and noise is positioned at the left side of spectrum, and one section zone that counting is lower is arranged between nuclear signal and the noise, is called counting paddy.Threshold value fixes on counting paddy the lowest point, and promptly the minimum place of counting generally is positioned at counting paddy centre position, M point as shown in Figure 8.The horizontal ordinate road location m ' of the fixed corresponding multichannel pulse scope-analyzer of discrimination threshold M point, with m ' substitution location, multichannel pulse scope-analyzer road, location, road and magnitude of voltage transformation for mula A=pm+A
0(this formula is provided by the instructions of multichannel pulse scope-analyzer; M is the location, and A is the m corresponding voltage value, and p is a coefficient, A
0Be constant), obtain optimal threshold A '.Obtain optimal threshold A ', need the threshold value adjustment of discriminator be worth to this.Hardware configuration is as shown in Figure 7, and the threshold value adjustment of discriminator needs by signal generator and oscillograph.Parameter constants such as main amplifier enlargement factor, time constant; Use signal generator to import square-wave pulse signal to main amplifier; Use oscillograph to observe main amplifier output, regulate the square-wave pulse signal amplitude, making the main amplifier output amplitude is the pulse signal of A '.Use oscillograph to observe discriminator output, the threshold value of discriminator is regulated from small to large, till discriminator does not just have pulse signal output, explain that the actual threshold of discriminator has been adjusted to optimal threshold A '.
(5) under discriminator threshold value, amplifier magnification ratio, the changeless situation of time constant, load radiation source and measure plateau curve, confirm the influence of high pressure fluctuations through calculating plateau slope to measurement data, hardware configuration is as shown in Figure 2; Under the condition of parameter constants such as discriminator threshold value, amplifier magnification ratio, time constant; Regulate the detector impressed voltage from small to large after loading radiation source; Read counting rate (or fixation measuring time counting) through scaler, the curve that meter digit rate (or fixation measuring time counting) changes with impressed voltage.Record plateau curve as shown in Figure 3,
calculates plateau slope according to the plateau slope computing formula.
Embodiment
Nuclear radiation detector uses
3The He proportional counter tube, radiation source uses
241The Am-Be isotope neutron source.Use the pulse amplitude spectrum assay method to confirm time constant, its hardware configuration is as shown in Figure 5.
3The He working voltage of proportional counter tube generally between 1000 to 1500V, during experiment, is incited somebody to action
3He proportional counter tube impressed voltage transfers to 1150V.Under this high pressure, pulse height spectral resolution height and main amplifier output do not distort, and minimum time constant is main amplifier integration 2 μ s, differential 4 μ s.As shown in Figure 9, main amplifier is little, the pulse amplitude spectrum main peak generation splitting of each 4 μ s (situation of Fig. 9 (a)) of integration, and resolution obviously is worse than the pulse height spectral resolution of main amplifier integration 2 μ s differential 4 μ s (situation of Fig. 9 (b)).
Under the time constant of main amplifier integration 2 μ s differential 4 μ s, use the pulse amplitude spectrum assay method to confirm the detector optimum operating voltage, hardware configuration is as shown in Figure 6, and measurement result is shown in figure 10.
3He proportional counter tube optimum operating voltage (being minimum, the interval lower limit of WV) is 1250V, and the main amplifier enlargement factor is 30 under the optimum operating voltage.
Measuring the discriminator optimal threshold according to the pulse amplitude spectrum utilization shown in Figure 10 that records (b) " pulse-amplitude discriminator discrimination threshold assay method " is 0.46V, and the discriminator threshold value adjustment is worth to this.
Parameters such as discriminator threshold value, amplifier magnification ratio, time constant immobilize, and load neutron source and measure plateau curve, and the result is shown in Figure 11 (a).Plateau length 200V (1150～1350V), plateau slope 1.6%/100V.
Amplifier magnification ratio, time constant immobilize, and the discriminator threshold value is transferred to 1.46V by 0.46V, load neutron source and measure plateau curve.The result does not measure and has the plateau curve of counting the level ground shown in Figure 11 (b), has verified that the influence that the discriminator threshold value selects plateau curve is measured is very big, if select improper even can not measure plateau curve.
The prime amplifier model QF07 that uses in the present embodiment, main amplifier model BH1218, multichannel pulse scope-analyzer model 2048; Signal generator model SU5102; Amplitude discriminator model BH1299A, oscillograph model TDS2024, scaler model BH1220N.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technology thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1. a nuclear radiation detector WV scaling method comprises the steps:
(1) with the plus high-pressure of nuclear radiation detector transfer in the WV interval of estimation more arbitrarily; Measure the pulse amplitude spectrum of the main amplifier output that is connected with nuclear radiation detector through multichannel pulse scope-analyzer; The horizontal ordinate of said pulse amplitude spectrum is the road number of multichannel pulse scope-analyzer, and ordinate is the counting of multichannel pulse scope-analyzer;
(2) little, the integration time constant of adjusting main amplifier, the time constant that strobe pulse amplitude spectrum intermediate-resolution is high, resolution=main peak halfwidth/location, main peak road;
(3) under the selected time constant of step (2), the optimum operating voltage of definite kernel radiation detector, described optimum operating voltage are the interval lower limit of nuclear radiation detector WV, and confirm the big device enlargement factor of master under optimum operating voltage;
(4) measure the discriminator optimal threshold according to the corresponding pulse amplitude spectrum of the optimum operating voltage that records and with the discriminator threshold value adjustment to this optimum value;
(5) under discriminator threshold value, amplifier magnification ratio, the changeless situation of time constant, load radiation source and measure plateau curve, confirm the influence of high pressure fluctuations through calculating plateau slope to measurement data.
2. nuclear radiation detector WV scaling method as claimed in claim 1; It is characterized in that: in the step (2); When regulating little, the integration time constant of main amplifier, use oscillograph to observe the shape of main amplifier output pulse, guarantee that its peak shape does not distort.
3. nuclear radiation detector WV scaling method as claimed in claim 2 is characterized in that: in the step (2), under the identical situation of pulse amplitude spectrum intermediate-resolution, select relatively little time constant.
4. like any described nuclear radiation detector WV scaling method among the claim 1-3; It is characterized in that: in the step (3); The method of the optimum operating voltage of definite kernel radiation detector is: under the situation that loads radiation source, the plus high-pressure of nuclear radiation detector is regulated from small to large, measured the pulse amplitude spectrum of main amplifier output; Thereby regulate the width that the main amplifier enlargement factor changes pulse amplitude spectrum; Pulse amplitude spectrum is transferred to till the counting paddy that certain width occurs, reach the requirement that nuclear signal and noise signal are screened, described counting paddy is meant one section zone that counting is lower between the nuclear signal and noise signal in the pulse amplitude spectrum.
5. nuclear radiation detector WV scaling method as claimed in claim 4; It is characterized in that: in the step (4); The method of measuring the discriminator optimal threshold is: in said pulse amplitude spectrum, confirm pairing some M of discrimination threshold, said M point is positioned at the counting paddy the lowest point of pulse amplitude spectrum; M ' the substitution location, multichannel pulse scope-analyzer road, location, horizontal ordinate road and the magnitude of voltage transformation for mula A=pm+A of the multichannel pulse scope-analyzer that discrimination threshold M point is corresponding
0, obtain optimal threshold A ',
Wherein, m is the location, and A is the m corresponding voltage value, and p is a coefficient, A
0Be constant.
6. nuclear radiation detector WV scaling method as claimed in claim 5; It is characterized in that: be: use signal generator to import square-wave pulse signal to main amplifier with the method for discriminator threshold value adjustment to optimum value; Use oscillograph to observe main amplifier output; Regulate the square-wave pulse signal amplitude, making the main amplifier output amplitude is the pulse signal of A '; Use oscillograph to observe the output of the discriminator that is connected with main amplifier, the threshold value of discriminator is regulated from small to large, till discriminator did not just have pulse signal output, this moment, the actual threshold of discriminator was adjusted to optimal threshold A '.
7. nuclear radiation detector WV scaling method as claimed in claim 6; It is characterized in that: in the step (5); The method of measuring plateau curve is: regulate the nuclear radiation detector plus high-pressure from small to large after loading radiation source; Read counting rate or fixation measuring time counting through scaler, the curve that meter digit rate or fixation measuring time counting change with the nuclear radiation detector plus high-pressure.
8. nuclear radiation detector WV calibration system; It is characterized in that: comprise that time constant confirms that device, optimum operating voltage confirm device, discriminator threshold value adjustment device, plateau curve determinator; Wherein, described time constant confirms that device and optimum operating voltage confirm that device adopts identical hardware configuration, comprises nuclear radiation detector; Nuclear radiation detector connects prime amplifier and main amplifier in order; High-voltage power supply is transferred on the nuclear radiation detector through prime amplifier, and main amplifier is connected with multichannel pulse scope-analyzer, and multichannel pulse scope-analyzer connects computing machine; Described discriminator threshold value adjustment device comprises signal generator, and signal generator is connected with main amplifier, and main amplifier connects amplitude discriminator and oscillograph respectively, and amplitude discriminator is connected with oscillograph; Described plateau curve determinator comprises nuclear radiation detector; Nuclear radiation detector connects prime amplifier and main amplifier in order; High-voltage power supply is transferred on the nuclear radiation detector through prime amplifier, and main amplifier is connected with amplitude discriminator, and amplitude discriminator connects scaler.
9. nuclear radiation detector WV calibration system as claimed in claim 8 is characterized in that: described time constant confirms that the main amplifier of device also is connected with oscillograph.
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| CN107272042B (en) * | 2016-04-07 | 2019-03-15 | 广州兰泰胜辐射防护科技有限公司 | A kind of method and device for the ionizing radiation dose obtaining radiation detector |
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| CN111198348A (en) * | 2020-01-08 | 2020-05-26 | 杭州电子科技大学 | Calibration method for noise test system of magnetic sensor |
| CN111198348B (en) * | 2020-01-08 | 2021-12-21 | 杭州电子科技大学 | Calibration method for noise test system of magnetic sensor |
| CN113418942A (en) * | 2021-06-23 | 2021-09-21 | 中国核动力研究设计院 | Automatic calibration method and device for boron concentration measurement system |
| CN113418942B (en) * | 2021-06-23 | 2024-02-06 | 中国核动力研究设计院 | Automatic calibration method and device for boron concentration measurement system |
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