CN102830420B - 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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- CN102830420B CN102830420B CN201210320879.9A CN201210320879A CN102830420B CN 102830420 B CN102830420 B CN 102830420B CN 201210320879 A CN201210320879 A CN 201210320879A CN 102830420 B CN102830420 B CN 102830420B
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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 nuclear radiation measurement technical field, be specifically related to a kind of nuclear radiation detector operating voltage scaling method and system.
Background technology
Nuclear radiation ionization meter is one of routine work relating to core area research, and measuring system hardware configuration as shown in Figure 1.Nuclear radiation detector converts nuclear signal to electric signal and processes for follow-up nuclear electronics system, and nuclear radiation detector must normally work of plus high-pressure.As shown in Figure 1, high-voltage power supply is transferred on nuclear radiation detector by prime amplifier.High pressure size affects nuclear radiation detector real work performance, must demarcate by experiment.It is to determine its optimum operating voltage on the one hand that nuclear radiation detector operating voltage is demarcated, and is to determine the impact of high pressure fluctuations on measurement data on the other hand.Plateau curve assay method is traditional nuclear radiation detector operating voltage scaling method, and its hardware configuration as shown in Figure 2.Under the condition of the parameter constants such as discriminator threshold value, amplifier magnification ratio, time constant, after loading radiation source, regulate from small to large detector impressed voltage, by scaler, read counting rate (or fixation measuring time counting), the curve that meter digit rate (or fixation measuring time counting) changes with impressed voltage.Record and on count curve, have obvious counting Ping Qu, thus plateau curve be called, as shown in Figure 3.Optimum operating voltage is located in level ground, position as shown in arrow as downward in Fig. 3.Counting Ping Qu in fact counting rate (or fixation measuring time counting) still with operating voltage, raise and to increase, show level ground and have the gradient, be called plateau slope, the number percent that counting rate while referring to every rising 100V (or fixation measuring time counting) increases, 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 less sign high pressure fluctuations of plateau slope is less on the impact of measurement data, otherwise larger.
Plateau curve measurement is to carry out under the constant condition of discriminator threshold value, amplifier magnification ratio, time constant, and the definite operating voltage of plateau curve is the optimum operating voltage of (parameter such as discriminator threshold value, amplifier magnification ratio, time constant immobilizes) detector under work at present condition.Various types of nuclear radiation detector operating voltage have an interval, if discriminator threshold value, amplifier magnification ratio, time constant are selected suitablely can measure plateau curve, the definite optimum operating voltage of plateau curve drops in this interval.In fact discriminator threshold value and amplifier magnification ratio are measured impact greatly to plateau curve, and the plateau curve that different discriminator threshold values and amplifier magnification ratio are measured gained is not identical yet, and definite operating voltage is not identical yet.If discriminator threshold value and the improper of amplifier magnification ratio selection even can not be measured plateau curve, do not determine optimum operating voltage.And the selection of discriminator threshold value, amplifier magnification ratio, time constant does not have a set of rational method, with very large randomness.
Because any point in detector operating voltage interval can meet measurement requirement, and low-work voltage contributes to extend detector serviceable life, improve γ signal suppressing ability, reduce effluve phenomenon, therefore optimum operating voltage of the present invention is the lower limit in detector operating voltage interval.In order to record the interval lower limit of detector operating voltage, need to reject discriminator threshold value, amplifier magnification ratio, time constant to the impact of measuring, traditional plateau curve assay method can not meet the demands.
Summary of the invention
The object of the invention is to the defect for prior art, a kind of nuclear radiation detector operating voltage scaling method and system based on pulse amplitude spectrum is provided, the method is under definite time constant, amplifier magnification ratio, discriminator threshold condition, measure plateau curve, avoided parameter that the situation that does not measure plateau curve is arbitrarily set.
Technical scheme of the present invention is as follows: a kind of nuclear radiation detector operating voltage scaling method, comprises the steps:
(1) plus high-pressure of nuclear radiation detector is adjusted to any point in the operating voltage interval of estimation, by multichannel pulse scope-analyzer, measure the pulse amplitude spectrum of the main amplifier output being connected with nuclear radiation detector, the horizontal ordinate of described pulse amplitude spectrum is the road number of multichannel pulse scope-analyzer, the counting that ordinate is multichannel pulse scope-analyzer;
(2) regulate micro-, the integration time constant of main amplifier, the time constant that strobe pulse amplitude spectrum intermediate-resolution is high, location, resolution=main peak halfwidth/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 is the lower limit in nuclear radiation detector operating voltage interval, and determines the large device enlargement factor of master under optimum operating voltage;
(4) according to pulse amplitude spectrum corresponding to the optimum operating voltage recording, measure discriminator optimal threshold and discriminator threshold value is adjusted to this optimum value;
(5) in discriminator threshold value, amplifier magnification ratio, the changeless situation of time constant, load radiation source and measure plateau curve, by calculating plateau slope, determine the impact of high pressure fluctuations on measurement data.
Further, nuclear radiation detector operating voltage scaling method as above, in step (2), when regulating micro-, the integration time constant of main amplifier, is used oscillograph to observe the shape of main amplifier output pulse, guarantees that its peak shape does not distort.
Further, nuclear radiation detector operating voltage scaling method as above, in step (2), in the situation that pulse amplitude spectrum intermediate-resolution is identical, selects relatively little time constant.
Further, nuclear radiation detector operating voltage scaling method as above, in step (3), the method of the optimum operating voltage of definite kernel radiation detector is: in the situation that loading 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 main amplifier enlargement factor to change the width of pulse amplitude spectrum, till pulse amplitude spectrum is adjusted to the counting paddy that occurs certain width, reach the requirement that nuclear signal and noise signal are screened, described counting paddy refers to one section of region that counting is lower between nuclear signal and noise signal in pulse amplitude spectrum.
Further, nuclear radiation detector operating voltage scaling method as above, in step (4), the method for measuring discriminator optimal threshold is: in described pulse amplitude spectrum, determine corresponding some M of discrimination threshold, described M point is positioned at the counting paddy the lowest point of pulse amplitude spectrum; By location, m ' substitution multichannel pulse scope-analyzer road, location, horizontal ordinate road and the magnitude of voltage transformation for mula A=pm+A of multichannel pulse scope-analyzer corresponding to discrimination threshold M point
0, obtain optimal threshold A ', wherein, m is location, and A is the magnitude of voltage that m is corresponding, and p is coefficient, A
0for constant.
Further, nuclear radiation detector operating voltage scaling method as above, in step (4), the method that discriminator threshold value is adjusted to optimum value is: use signal generator to input square-wave pulse signal to main amplifier, use oscillograph to observe main amplifier output, regulate square-wave pulse signal amplitude, making main amplifier output amplitude is the pulse signal of A '; Use oscillograph to observe the output of the discriminator being connected with main amplifier, the threshold value of discriminator is regulated from small to large, until discriminator does not just have output of pulse signal, now the actual threshold of discriminator has been adjusted to optimal threshold A '.
Further, nuclear radiation detector operating voltage scaling method as above, in step (5), the method of measuring plateau curve is: after loading radiation source, regulate from small to large nuclear radiation detector plus high-pressure, by scaler, read counting rate or fixation measuring time counting, the curve that meter digit rate or fixation measuring time counting change with nuclear radiation detector plus high-pressure.
A kind of nuclear radiation detector operating voltage calibration system, comprise time constant determining device, optimum operating voltage determining device, discriminator threshold value regulating device, plateau curve determinator, wherein, described time constant determining device and optimum operating voltage determining device adopt identical hardware configuration, comprise nuclear radiation detector, nuclear radiation detector connects prime amplifier and main amplifier in turn, high-voltage power supply is transferred on nuclear radiation detector by prime amplifier, main amplifier is connected with multichannel pulse scope-analyzer, multichannel pulse scope-analyzer connects computing machine, described discriminator threshold value regulating device comprises signal generator, and signal generator is connected with main amplifier, and main amplifier connects respectively amplitude discriminator and oscillograph, 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 turn, high-voltage power supply is transferred on nuclear radiation detector by prime amplifier, and main amplifier is connected with amplitude discriminator, and amplitude discriminator connects scaler.
Further, nuclear radiation detector operating voltage calibration system as above, wherein, the main amplifier of described time constant determining device is also connected with oscillograph.
Beneficial effect of the present invention is as follows: the present invention is based on the demarcation that pulse amplitude spectrum assay method carries out nuclear radiation detector operating voltage, compared with the plateau curve assay method of prior art, the selection of time constant, amplifier magnification ratio, discriminator threshold value is no longer random, and the selection that pulse amplitude spectrum assay method is these parameters provides a set of complete method.The definite nuclear radiation detector optimum operating voltage of pulse height spectral method is the lower limit in detector operating voltage interval, it is the minimum that detector can normally be worked, the detector optimum operating voltage more definite than plateau curve assay method is little, low-work voltage contributes to extend detector serviceable life, improve γ signal suppressing ability, reduce effluve phenomenon.Using under the definite time constant of pulse amplitude spectrum assay method, amplifier magnification ratio, discriminator threshold condition, measure plateau curve, avoided parameter that the situation that does not measure plateau curve is arbitrarily set.
Accompanying drawing explanation
Fig. 1 is nuclear radiation strength measurement system hardware configuration schematic diagram;
Fig. 2 is plateau curve assay method hardware configuration schematic diagram;
Fig. 3 is plateau curve schematic diagram;
Fig. 4 is method flow diagram of the present invention;
Fig. 5 is the hardware configuration schematic diagram that the present invention determines time constant;
Fig. 6 is the hardware configuration schematic diagram that the present invention determines detector optimum operating voltage;
Fig. 7 is that discriminator threshold value of the present invention regulates hardware configuration schematic diagram;
Fig. 8 is pulse amplitude spectrum schematic diagram;
Fig. 9 is in embodiment during impressed voltage 1150V
3he proportional counter tube pulse amplitude spectrum;
(a) each 4 μ s of micro-, the integration of main amplifier, (b) main amplifier integration 2 μ s, differential 4 μ s;
Figure 10 is in embodiment under 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 in embodiment; (a) 0.46V, (b) 1.46V.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
The hardware configuration of nuclear radiation detector operating voltage calibration system provided by the present invention comprises time constant determining device, optimum operating voltage determining device, discriminator threshold value regulating device, plateau curve determinator, wherein, the structure of described time constant determining device as shown in Figure 5, the structure of optimum operating voltage determining device as shown in Figure 6, two devices adopt essentially identical hardware configuration, comprise nuclear radiation detector, nuclear radiation detector connects prime amplifier and main amplifier in turn, high-voltage power supply is transferred on nuclear radiation detector by prime amplifier, main amplifier is connected with multichannel pulse scope-analyzer, multichannel pulse scope-analyzer connects computing machine.The main amplifier of time constant determining device is also connected with oscillograph, observes the shape of main amplifier output pulse by oscillograph, guarantees that its peak shape does not distort.
The structure of described discriminator threshold value regulating device as shown in Figure 7, comprises signal generator, and signal generator is connected with main amplifier, and main amplifier connects respectively amplitude discriminator and oscillograph, and amplitude discriminator is connected with oscillograph.
Described plateau curve determinator as shown in Figure 2, comprise nuclear radiation detector, nuclear radiation detector connects prime amplifier and main amplifier in turn, and high-voltage power supply is transferred on nuclear radiation detector by prime amplifier, main amplifier is connected with amplitude discriminator, and amplitude discriminator connects scaler.
As shown in Figure 4, nuclear radiation detector operating voltage scaling method provided by the present invention, obtaining on the basis of pulse amplitude spectrum, first determine main amplifier time constant, then determine nuclear radiation detector optimum operating voltage under this time constant, then determine amplifier magnification ratio and discriminator threshold value under this detector optimum operating voltage.Under this condition, parameters such as (immobilize) discriminator threshold value, amplifier magnification ratio, time constants measures plateau curve, by calculating plateau slope, determines the impact of high pressure fluctuations on measurement data.Specifically comprise the steps:
(1) because nuclear radiation detector operating voltage interval of the same type is can difference too not large, the plus high-pressure of nuclear radiation detector is adjusted to any point in the operating voltage interval of estimation, by multichannel pulse scope-analyzer, measure the pulse amplitude spectrum of the main amplifier output being connected with nuclear radiation detector, as shown in Figure 8, the horizontal ordinate of described pulse amplitude spectrum is the road number of multichannel pulse scope-analyzer, the counting that ordinate is multichannel pulse scope-analyzer.
(2) regulate micro-, the integration time constant of main amplifier, the time constant that strobe pulse amplitude spectrum intermediate-resolution is high, location, resolution=main peak halfwidth/main peak road, hardware configuration is as shown in Figure 5; During pulse height spectrometry, also need to use oscillograph to observe the shape of main amplifier output pulse, guarantee that it does not distort; To same nuclear radiation detector, because the larger main amplifier of time constant output pulse is wider, counting loss rate is higher, thus under identical pulse amplitude spectrum resolution prerequisite in order to reduce counting loss rate, select little time constant.
(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, it (is 100V according to the starting point of the general voltage-regulation of practical experience that high pressure is regulated from small to large, certainly also can be from 0V adjusts), measure main amplifier output pulse amplitude spectrum, regulate main amplifier enlargement factor that pulse amplitude spectrum is adjusted to suitable width, until there is having as shown in Figure 8 the counting paddy (reaching the requirement that nuclear signal and noise signal are screened) of certain width in pulse amplitude spectrum, described counting paddy refers to one section of region that counting is lower between nuclear signal and noise signal in pulse amplitude spectrum, counting paddy width can cover 1/10 of multiple tracks interval width for main amplifier output pulse amplitude spectrum, impressed voltage is now exactly detector optimum operating voltage, also be the interval lower limit of detector operating voltage, amplifier magnification ratio is now exactly amplifier magnification ratio under optimum operating voltage.
(4) pulse amplitude spectrum (main amplifier enlargement factor, time constant immobilize, the pulse amplitude spectrum that optimum operating voltage is corresponding) the discriminator optimal threshold that basis records is also adjusted to this optimum value by discriminator threshold 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, has one section of region that counting is lower between nuclear signal and noise, is called counting paddy.Threshold value fixes on counting paddy the lowest point, counts minimum place, is generally 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, by location, m ' substitution 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 location, and A is the magnitude of voltage that m is corresponding, and p is coefficient, A
0for constant), obtain optimal threshold A '.Obtain optimal threshold A ', the threshold value of discriminator need to be adjusted to this value.As shown in Figure 7, the threshold value of discriminator regulates need be by signal generator and oscillograph for hardware configuration.The parameter constants such as main amplifier enlargement factor, time constant, use signal generator to input square-wave pulse signal to main amplifier, use oscillograph to observe main amplifier output, regulate square-wave pulse signal amplitude, making 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, until discriminator does not just have output of pulse signal, illustrate that the actual threshold of discriminator has been adjusted to optimal threshold A '.
(5) in discriminator threshold value, amplifier magnification ratio, the changeless situation of time constant, load radiation source and measure plateau curve, by calculating plateau slope, determine the impact of high pressure fluctuations on measurement data, hardware configuration is as shown in Figure 2; Under the condition of the parameter constants such as discriminator threshold value, amplifier magnification ratio, time constant, after loading radiation source, regulate from small to large detector impressed voltage, by scaler, read counting rate (or fixation measuring time counting), the curve that meter digit rate (or fixation measuring time counting) changes with impressed voltage.Record plateau curve as shown in Figure 3, according to plateau slope computing formula
calculate plateau slope.
Embodiment
Nuclear radiation detector uses
3he proportional counter tube, radiation source is used
241am-Be isotope neutron source.Use pulse amplitude spectrum assay method to determine time constant, its hardware configuration as shown in Figure 5.
3he working voltage of proportional counter tube generally, between 1000 to 1500V, during experiment, is incited somebody to action
3he proportional counter tube impressed voltage is adjusted to 1150V.Under this high pressure, the output of the high and main amplifier of pulse height spectral resolution does 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 micro-, the situation of each 4 μ s(Fig. 9 (a) of integration) pulse amplitude spectrum main peak generation splitting, resolution is obviously worse than the situation of main amplifier integration 2 μ s differential 4 μ s(Fig. 9 (b)) pulse height spectral resolution.
Under the time constant of main amplifier integration 2 μ s differential 4 μ s, use pulse amplitude spectrum assay method to determine detector optimum operating voltage, as shown in Figure 6, measurement result as shown in figure 10 for hardware configuration.
3he proportional counter tube optimum operating voltage (being minimum, the interval lower limit of operating voltage) is 1250V, and under optimum operating voltage, main amplifier enlargement factor is 30.
According to the pulse amplitude spectrum utilization shown in Figure 10 recording (b) " pulse-amplitude discriminator discrimination threshold assay method ", measuring discriminator optimal threshold is 0.46V, and discriminator threshold value is adjusted to this value.
The parameters such as discriminator threshold value, amplifier magnification ratio, time constant immobilize, and load neutron source and measure plateau curve, and result as shown in Figure 11 (a) shows.Plateau length 200V (1150～1350V), plateau slope 1.6%/100V.
Amplifier magnification ratio, time constant immobilize, and discriminator threshold value is adjusted to 1.46V by 0.46V, load neutron source and measure plateau curve.Result, as shown in Figure 11 (b), is not measured the plateau curve with counting level ground, has verified that the selection of discriminator threshold value is very big on the impact of plateau curve measurement, if the improper of selection even can not be measured plateau curve.
The prime amplifier model QF07 using 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 and not depart from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and within modification belongs to the scope of the claims in the present invention and equivalent technology thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (7)
1. a nuclear radiation detector operating voltage scaling method, comprises the steps:
(1) plus high-pressure of nuclear radiation detector is adjusted to any point in the operating voltage interval of estimation, by multichannel pulse scope-analyzer, measure the pulse amplitude spectrum of the main amplifier output being connected with nuclear radiation detector, the horizontal ordinate of described pulse amplitude spectrum is the road number of multichannel pulse scope-analyzer, the counting that ordinate is multichannel pulse scope-analyzer;
(2) regulate micro-, the integration time constant of main amplifier, the time constant that strobe pulse amplitude spectrum intermediate-resolution is high, location, resolution=main peak halfwidth/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 is the lower limit in nuclear radiation detector operating voltage interval, and determines the large device enlargement factor of master under optimum operating voltage; The method of the optimum operating voltage of definite kernel radiation detector is: in the situation that loading 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 main amplifier enlargement factor to change the width of pulse amplitude spectrum, till pulse amplitude spectrum is adjusted to the counting paddy that occurs certain width, reach the requirement that nuclear signal and noise signal are screened, described counting paddy refers to one section of region that counting is lower between nuclear signal and noise signal in pulse amplitude spectrum;
(4) according to pulse amplitude spectrum corresponding to the optimum operating voltage recording, measure discriminator optimal threshold and discriminator threshold value is adjusted to this optimum value; The method of measuring discriminator optimal threshold is: in described pulse amplitude spectrum, determine corresponding some M of discrimination threshold, described M point is positioned at the counting paddy the lowest point of pulse amplitude spectrum; By location, m ' substitution multichannel pulse scope-analyzer road, location, horizontal ordinate road and the magnitude of voltage transformation for mula A=pm+A of multichannel pulse scope-analyzer corresponding to discrimination threshold M point
0, obtain optimal threshold A ',
Wherein, m is location, and A is the magnitude of voltage that m is corresponding, and p is coefficient, A
0for constant;
(5) in discriminator threshold value, amplifier magnification ratio, the changeless situation of time constant, load radiation source and measure plateau curve, by calculating plateau slope, determine the impact of high pressure fluctuations on measurement data.
2. nuclear radiation detector operating voltage scaling method as claimed in claim 1, it is characterized in that: in step (2), when regulating micro-, 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 operating voltage scaling method as claimed in claim 2, is characterized in that: in step (2), in the situation that pulse amplitude spectrum intermediate-resolution is identical, select relatively little time constant.
4. nuclear radiation detector operating voltage scaling method as claimed in claim 1, it is characterized in that: the method that discriminator threshold value is adjusted to optimum value is: use signal generator to input square-wave pulse signal to main amplifier, use oscillograph to observe main amplifier output, regulate square-wave pulse signal amplitude, making main amplifier output amplitude is the pulse signal of A '; Use oscillograph to observe the output of the discriminator being connected with main amplifier, the threshold value of discriminator is regulated from small to large, until discriminator does not just have output of pulse signal, now the actual threshold of discriminator has been adjusted to optimal threshold A '.
5. nuclear radiation detector operating voltage scaling method as claimed in claim 4, it is characterized in that: in step (5), the method of measuring plateau curve is: after loading radiation source, regulate from small to large nuclear radiation detector plus high-pressure, by scaler, read counting rate or fixation measuring time counting, the curve that meter digit rate or fixation measuring time counting change with nuclear radiation detector plus high-pressure.
6. one kind for realizing the nuclear radiation detector operating voltage calibration system of method described in claim 1, it is characterized in that: comprise time constant determining device, optimum operating voltage determining device, discriminator threshold value regulating device, plateau curve determinator, wherein, described time constant determining device and optimum operating voltage determining device adopt identical hardware configuration, comprise nuclear radiation detector, nuclear radiation detector connects prime amplifier and main amplifier in turn, high-voltage power supply is transferred on nuclear radiation detector by prime amplifier, main amplifier is connected with multichannel pulse scope-analyzer, multichannel pulse scope-analyzer connects computing machine, described discriminator threshold value regulating device comprises signal generator, and signal generator is connected with main amplifier, and main amplifier connects respectively amplitude discriminator and oscillograph, 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 turn, high-voltage power supply is transferred on nuclear radiation detector by prime amplifier, and main amplifier is connected with amplitude discriminator, and amplitude discriminator connects scaler.
7. nuclear radiation detector operating voltage calibration system as claimed in claim 6, is characterized in that: the main amplifier of described time constant determining device is also connected with oscillograph.
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| CN103226204B (en) * | 2013-04-01 | 2015-07-15 | 中国科学院高能物理研究所 | System and method for testing signal of detector |
| 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 |
| DE102016122048A1 (en) * | 2016-11-16 | 2018-05-17 | Endress+Hauser SE+Co. KG | Method for determining a remaining operating time duration of a detector unit |
| CN109358297A (en) * | 2018-11-07 | 2019-02-19 | 吉林大学 | A kind of device and method of detector power supply system measurement |
| 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 |
| 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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