CN115453606A - Real-time measurement method and prediction method for radiation resistance of scintillator - Google Patents
Real-time measurement method and prediction method for radiation resistance of scintillator Download PDFInfo
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- 230000005855 radiation Effects 0.000 title claims abstract description 67
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- 230000002285 radioactive effect Effects 0.000 claims description 35
- 239000013078 crystal Substances 0.000 claims description 21
- XKUYOJZZLGFZTC-UHFFFAOYSA-K lanthanum(iii) bromide Chemical compound Br[La](Br)Br XKUYOJZZLGFZTC-UHFFFAOYSA-K 0.000 claims description 21
- 230000014509 gene expression Effects 0.000 claims description 12
- 230000001678 irradiating effect Effects 0.000 claims description 8
- 229910052792 caesium Inorganic materials 0.000 claims description 6
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims description 6
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
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Abstract
The invention particularly relates to a real-time measurement method and a prediction method for the radiation resistance of a scintillator, and solves the technical problems that the conventional method for measuring the radiation resistance of the scintillator can only measure the change of the integral light output of the scintillator after the irradiation is finished, and the measurement result is a single finite point, and the measurement error is large and the economic benefit is poor due to the fact that a detector needs to be reassembled during each measurement and the test condition is restored. The real-time measurement method for the radiation resistance of the scintillator comprises the following steps: a1 Constructing a real-time measurement system for the radiation resistance of the scintillator; a2 Obtaining a variation curve of the output current of the detector along with the irradiation time; a3 Obtaining a relative light output change curve of the scintillator to be detected; a4 Calculating the irradiation doses corresponding to different irradiation times of the scintillator to be measured in the relative light output change curve of the scintillator to be measured to obtain the change curve of the relative light output of the scintillator to be measured along with the irradiation doses, and completing the real-time measurement of the anti-irradiation performance of the scintillator to be measured.
Description
Technical Field
The invention particularly relates to a real-time measurement method and a prediction method for the radiation resistance of a scintillator.
Background
The radiation resistance of the scintillator mainly refers to the change condition of the performance parameters and the microstructure of the scintillator after radiation. In radiation detection, radiation damage of a scintillator is mainly manifested as a decrease in light output, and the light output of the scintillator directly affects the sensitivity, resolution and other indexes of a detector to rays. Therefore, for a radiation detector, the variation of light output with irradiation dose is a key performance index for measuring the radiation resistance of the radiation detector.
The general measurement method of the radiation resistance of the scintillator comprises the following steps: a counting type scintillation detector is formed by a scintillator and a photomultiplier, the detector is used for measuring the gamma energy spectrum of standard radioactive sources (cobalt, cesium and the like) with lower intensity, and the position of a full energy peak in a gamma is recorded; and taking out the scintillator, irradiating the scintillator under the irradiation of standard radioactive sources such as cobalt, cesium and the like with high intensity until the target irradiation dose is reached, placing the scintillator in an original scintillator detector after the irradiation is stopped, measuring the gamma energy spectrum under the same condition as the initial state, and recording the position of the full energy peak at the moment. The positions of the omnipotent peaks measured twice are compared, and the change reflects the change of the light output of the scintillator and the anti-irradiation performance of the scintillator. The above steps are repeated, and the radiation resistance of the scintillator under different target radiation doses can be measured.
In summary, the conventional method has the following disadvantages: firstly, the overall light output change condition of the scintillator can be measured only after irradiation is finished, and the measurement result is a single limited point; secondly, the detector needs to be reassembled during each measurement, and the test conditions are restored, so that a large measurement error is introduced; thirdly, when the target irradiation dose is large, the required irradiation time is long, and meanwhile, the scintillator is possibly irradiated to be ineffective, so that the economic benefit is poor.
Disclosure of Invention
The invention aims to solve the problems that the existing method for measuring the radiation resistance of the scintillator can only measure the change of the integral light output of the scintillator after the irradiation is finished, the measurement result is a single finite point, and the technical problems of large measurement error and poor economic benefit caused by the fact that a detector needs to be reassembled during each measurement and the test condition is restored, and provides a real-time measurement method and a prediction method for the radiation resistance of the scintillator.
The concept of the invention is as follows:
the system adopted by the method for measuring the radiation resistance of the scintillator in real time replaces a counting type scintillation detector in conventional measurement with a current type detector with a larger linear dynamic range, and under the radiation of a radioactive source, the output current of the detector is acquired in real time by utilizing the principle that the output current of the detector is in direct proportion to the relative light output of the scintillator to be measured, so that the relative light output change condition of the scintillator to be measured in the detector is represented, and the radiation resistance of the scintillator to be measured is evaluated.
In the method for predicting the radiation resistance of the scintillator, when the target radiation dose is low, the method for measuring the radiation resistance of the scintillator in real time can be directly adopted for real-time measurement, and the relative light output change process of the scintillator to be measured from the initial time to the target radiation dose is obtained. When the target irradiation dose is higher, the scintillator to be detected is directly irradiated, so that the scintillator to be detected is irreversibly damaged, the use of the scintillator to be detected is influenced, and the time cost is higher, so that the scintillator to be detected can be irradiated to be lower than the target irradiation dose in an experiment, a section of change curve of the light output of the scintillator to be detected along with the irradiation dose is obtained, the change curve of the light output of the scintillator to be detected along with the irradiation dose is fitted, and a relational expression of the light output of the scintillator to be detected and the irradiation dose under the current condition is obtained; thereby calculating the relative light output of the scintillator to be detected under the target irradiation dose and realizing the prediction of the anti-irradiation performance of the scintillator to be detected; the method for predicting the radiation resistance of the scintillator can save time and prevent the scintillator to be detected from being damaged due to overlarge radiation dose.
In order to solve the technical problems, the technical scheme adopted by the invention for realizing the inventive concept is as follows:
a real-time measurement method for the radiation resistance of a scintillator is characterized by comprising the following steps:
a1 Constructing a real-time measurement system for the radiation resistance of the scintillator;
the real-time measurement system for the radiation resistance of the scintillator comprises a radioactive source, a detector, an ammeter and a power supply;
the detector comprises a photoelectric device arranged on a light emitting route of the scintillator to be detected;
the scintillator to be detected is positioned on a ray emergent path of the radioactive source;
the photoelectric device is positioned on a light emitting route of the scintillator to be detected;
the photoelectric device is respectively connected with the ammeter and the power supply.
A2 Placing a detector containing a scintillator to be detected on a ray outgoing line of a radioactive source, and recording the output current of the detector under the irradiation of the radioactive source in real time to obtain a change curve of the output current of the detector along with irradiation time;
a3 Defining that the relative light output of the scintillator to be detected corresponding to the current at the initial moment of the detector under the irradiation of a radioactive source is 100 percent;
normalizing the variation curve of the detector output current along with the irradiation time to obtain a relative light output variation curve of the scintillator to be detected;
a4 Calculating the irradiation doses corresponding to different irradiation times of the scintillator to be measured in the relative light output change curve of the scintillator to be measured to obtain the change curve of the relative light output of the scintillator to be measured along with the irradiation doses, and completing the real-time measurement of the anti-irradiation performance of the scintillator to be measured.
Further, the step A4) is specifically:
a4.1, measuring by using a dosimeter to obtain gamma irradiation dose rate at a detector or calculating the gamma irradiation dose rate at the position of the detector according to the radiation source intensity;
and A4.2, multiplying the gamma irradiation dose rate obtained in the step A4.1 by the irradiation time in the relative light output change curve of the scintillator to be detected to obtain the irradiation dose of the scintillator to be detected at each time, and further obtaining the change curve of the relative light output of the scintillator to be detected along with the irradiation dose.
Further, in the step A2), the real-time recording of the output current of the detector under the irradiation of the radiation source is specifically:
and recording the output current of the detector under the irradiation of the radioactive source in real time by using a weak galvanometer.
Further, in the step A3), the normalization processing specifically includes:
and performing normalization processing by using an index function, wherein the number of terms of the index function corresponds to the number of irradiation defect types of the scintillator to be detected.
Further, in the step A1), the system for measuring the radiation resistance of the scintillator in real time further comprises a collimation shielding device arranged between the radioactive source and the detector; the collimation shielding device is provided with a pore passage for ray collimation of the radioactive source;
the photoelectric device is connected with a power supply through a high-voltage cable;
the photoelectric device is connected with the ammeter through a signal cable.
Further, in step A1), the radioactive source is a cobalt source or a cesium source;
the scintillator to be detected is a lanthanum bromide crystal;
the photoelectric detector is a photoelectric tube or a photomultiplier;
the ammeter is a weak ammeter.
Meanwhile, the invention also provides a method for predicting the radiation resistance of the scintillator, which is characterized by comprising the following steps:
b1 Irradiating the scintillator to be measured to be lower than the target irradiation dose, and acquiring a change curve of the light output of the scintillator to be measured along with the irradiation dose by adopting the real-time measurement method for the radiation resistance of the scintillator;
b2 Fitting the change curve of the light output of the scintillator to be tested along with the irradiation dose obtained in the step B1) to obtain a relational expression of the light output of the scintillator to be tested and the irradiation time or the irradiation dose;
b3 Substituting the target irradiation dose into the relational expression obtained in the step B2) to obtain the relative light output of the scintillator to be detected, and realizing the prediction of the anti-irradiation performance of the scintillator to be detected under the target irradiation dose.
Further, in the step B2), the relation between the light output and the irradiation time of the scintillator to be measured is specifically:
wherein L (t) is relative light output of the scintillator t to be detected during the irradiation time, L 0 Indicating that the relative light output of the scintillator to be measured corresponding to the current at the initial moment is 100 percent and L 0 ＝1；a 1 、a 2 、τ 1 、τ 2 Fitting constants of relational expressions of light output and irradiation time of the scintillator to be detected;
or the relation between the light output and the irradiation dose of the scintillator to be detected is specifically as follows:
wherein L (D) is the relative light output of the irradiation dose of the scintillator D to be measured, a 11 、a 22 、τ 11 、τ 22 And fitting constants of relational expressions of the light output and the irradiation dose of the scintillator to be detected are obtained.
Further, in the step B1), the step of irradiating the scintillator to be detected to be lower than the target irradiation dose specifically includes:
and irradiating the scintillator (4) to be detected to 1/10 of the target irradiation dose.
Further, in the step B2), the irradiation dose D is
D＝tΦ
Wherein Φ is the irradiation dose rate.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
1. the system adopted by the method for measuring the radiation resistance of the scintillator in real time has a simple structure, the detector does not need to be disassembled and assembled during measurement, and the state of the system is always kept unchanged from the beginning to the end of the irradiation of the scintillator to be measured, so that the measurement precision is improved.
2. The method for measuring the radiation resistance of the scintillator in real time can measure the change curve of the light output of the scintillator to be measured along with the irradiation time in real time in the irradiation process, further obtain the change curve of the light output of the scintillator to be measured along with the irradiation dose, clearly reflect the change rule of the light output of the scintillator to be measured in the irradiation process, and complete the real-time measurement of the radiation resistance of the scintillator to be measured.
3. According to the method for predicting the radiation resistance of the scintillator, the change curve of the light output of the scintillator to be detected along with the radiation dose is obtained based on the method, the prediction of the radiation resistance of the scintillator to be detected under higher radiation dose rate can be realized, the time cost is saved, the continuous use of the scintillator to be detected is not influenced, and the economic benefit is improved.
Drawings
FIG. 1 is a schematic diagram of a system structure adopted in an embodiment of a method for measuring radiation resistance of a scintillator in real time.
FIG. 2 is a graph showing the variation of light output with irradiation dose when a radioactive source irradiates a lanthanum bromide crystal in the method for measuring the radiation resistance of a scintillator in real time, wherein A is a measured curve of relative light output data of the lanthanum bromide crystal, and B is a fitted curve of relative light output of the lanthanum bromide crystal.
The reference numbers in the figures are:
the device comprises a radiation source 1, a collimation shielding device 2, a detector 3, a scintillator to be detected 4, a photoelectric device 5, a high-voltage cable 6, a signal cable 7, a power supply 8 and a current meter 9.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art without creative efforts based on the technical solutions of the present invention belong to the protection scope of the present invention.
The invention discloses a method for measuring the radiation resistance of a scintillator in real time, which comprises the following steps:
a1 Constructing a real-time measurement system for the radiation resistance of the scintillator;
as shown in fig. 1, the system for measuring the radiation resistance of a scintillator in real time comprises a radioactive source 1, a detector 3, an ammeter 9 and a power supply 8;
the detector 3 comprises a photoelectric device 5 arranged on a light emitting route of a scintillator 4 to be detected; the scintillator 4 to be detected is positioned on the ray emergent path of the radioactive source 1; the photoelectric device 5 is positioned on the light emitting route of the scintillator 4 to be detected; the photoelectric device 5 is respectively connected with an ammeter 9 and a power supply 8.
In this embodiment, a collimation shield 2 is further provided, and the collimation shield 2 is arranged between the radioactive source 1 and the detector 3; wherein, the collimation shield is provided with a pore channel for ray collimation of the radioactive source; the ray of the radioactive source 1 is emitted to the scintillator 4 to be detected through the gap; a detector 3 formed by the scintillator 4 to be detected and the photoelectric device 5 is a current type detector; the photoelectric device 5 is connected with a power supply 8 through a high-voltage cable 6; the photoelectric device 5 is connected with an ammeter 9 through a signal cable 7. The radioactive source 1 is a cobalt source, and can also be a cesium source; the scintillator 4 to be detected is a lanthanum bromide crystal; the photoelectric detector 3 is a photoelectric tube or a photomultiplier; the power supply 8 provides working voltage for the detector 3, the galvanometer 9 is a weak galvanometer, and the weak galvanometer 9 records the output current of the detector 3 in real time.
A2 A detector 3 containing a scintillator 4 to be detected is placed on a ray outgoing line of a radioactive source 1, and the output current of the detector 3 under the irradiation of the radioactive source 1 is recorded in real time by adopting a weak galvanometer 9 to obtain a change curve of the output current of the detector 3 along with irradiation time;
a3 Define the relative light output of the scintillator 4 to be detected corresponding to the current value at the initial moment of the detector 3 under the irradiation of the radioactive source 1 to be 100%;
normalizing the variation curve of the output current of the detector 3 along with the irradiation time to obtain a relative light output variation curve of the scintillator 4 to be detected;
in the embodiment, an exponential function is adopted for normalization processing, and the number of terms of the exponential function corresponds to the number of irradiation defect types of the scintillator 4 to be detected; the irradiation defect type of the scintillator 4 to be detected mainly refers to different types of color centers generated by electrons and holes captured by atoms or impurity atoms in the scintillator 4 to be detected when the scintillator 4 to be detected is irradiated.
A4 Calculating irradiation doses corresponding to different irradiation times of the scintillator 4 to be detected in the relative light output change curve of the scintillator 4 to be detected, and obtaining a change curve of the relative light output of the scintillator 4 to be detected along with the irradiation doses, specifically:
a4.1, measuring by using a dosimeter to obtain the gamma irradiation dose rate at the detector 3, and calculating the gamma irradiation dose rate at the position of the detector 3 according to the intensity of the radioactive source 1;
and A4.2, multiplying the gamma irradiation dose rate obtained in the step A4.1 by the irradiation time in the relative light output change curve of the scintillator 4 to be detected to obtain the irradiation dose of the scintillator 4 to be detected at each time, and further obtaining the change curve of the relative light output of the scintillator 4 to be detected along with the irradiation dose. The light output change of the scintillator 4 to be measured when being irradiated is a key representation for measuring the anti-irradiation performance of the scintillator 4 to be measured, and can reflect the quality of the anti-irradiation performance of the scintillator 4 to be measured.
The embodiment of the method for measuring the radiation resistance of the scintillator in real time comprises the following steps:
in this embodiment, the radiation source 1 is a cesium source, and the detector 3 is composed of a scintillator 4 to be detected and a photoelectric tube.
The gamma irradiation dose rate of the detector 3 is 25Gy/h measured by a dosimeter, after an irradiation experiment is started, a weak ammeter 9 records a current value every second, the relative light output of the lanthanum bromide crystal corresponding to the current value at the initial time is set to be 100%, and the ratio of the current value at the subsequent time to the current value at the initial time is the relative light output at the time.
As shown in fig. 2, the change of the relative light output of the lanthanum bromide crystal during 2 hours of irradiation is shown, and it can be seen from fig. 2 that when the radioactive source irradiates the lanthanum bromide crystal, the light output thereof changes with the irradiation dose, where a is the actually measured curve of the relative light output data of the lanthanum bromide crystal, and B is the fitted curve of the relative light output of the lanthanum bromide crystal, it can be seen that the relative light output of the lanthanum bromide crystal continuously decreases with the increase of the irradiation dose; when the lanthanum bromide crystal is irradiated for 2 hours, the irradiation dose is 25Gy/h multiplied by 2h=50Gy, and the relative light output of the lanthanum bromide crystal becomes 98.6 percent. Therefore, the method can measure the change rule of the relative light output of the lanthanum bromide crystal along with the irradiation dose in real time and evaluate the irradiation resistance of the lanthanum bromide crystal.
Fitting the curve in the figure 2, because the lanthanum bromide crystal mainly forms two irradiation defects in irradiation, which affects the relative light output of the lanthanum bromide crystal, the curve is fitted by adopting a double exponential function in the following form:
wherein L (t) is the relative light output of the lanthanum bromide crystal t irradiation time, L 0 Representing 100% of initial light output of lanthanum bromide crystal, L 0 ＝1。
For the measured data, the other fitting constants are a 1 ＝0.008，τ 1 ＝1.623，a 2 ＝0.443，τ 2 ＝109.187。
Meanwhile, the invention also provides a scintillator irradiation dose prediction method, based on the real-time measurement system for the radiation resistance of the scintillator, which comprises the following steps:
b1 Irradiating the scintillator 4 to be measured to be lower than the target irradiation dose, and acquiring a variation curve of the relative light output of the scintillator 4 to be measured with the irradiation dose by adopting the real-time measurement method for the anti-irradiation performance of the scintillator; in this embodiment, the scintillator 4 to be measured is irradiated to 1/10 of the target irradiation dose.
B2 Fitting the change curve of the relative light output of the scintillator 4 to be detected along with the irradiation dose obtained in the step B1) to obtain a relational expression of the relative light output and the irradiation time of the scintillator 4 to be detected
Wherein L (t) is relative light output of 4t irradiation time of the scintillator to be detected, and L 0 The relative light output of the scintillator 4 to be measured corresponding to the current value at the initial time is 100%, L 0 ＝1；a 1 、a 2 、τ 1 、τ 2 And fitting a constant for the relation between the relative light output and the irradiation time of the scintillator 4 to be tested. The values of the fitting constants are related to the scintillator 4 to be measured and experimental conditions, and need to be calculated and obtained according to actual measurement data. In this example, a 1 ＝0.008，τ 1 ＝1.623，a 2 ＝0.443，τ 2 ＝109.187。
In other embodiments, a change curve of the relative light output of the scintillator 4 to be detected obtained in step 1) with the irradiation dose may also be fitted to obtain a relational expression between the relative light output and the irradiation dose of the scintillator 4 to be detected
In the formula, L (D) is relative light output of the D irradiation dose of the scintillator (4) to be detected, the irradiation dose D = t phi, phi is the irradiation dose rate at the detector 3, and a 11 、a 22 、τ 11 、τ 22 Are fitting constants of the relation between the relative light output and the irradiation dose of the scintillator 4 to be detected.
B3 Substituting the target irradiation dose into the relational expression obtained in the step B2) to obtain the relative light output of the scintillator 4 to be detected, and realizing the prediction of the anti-irradiation performance of the scintillator 4 to be detected under the target irradiation dose.
The scintillator irradiation dose prediction method comprises the following processes:
(1) The detector 3 containing the scintillator 4 to be detected is placed in a ray channel with known intensity, the detector 3 works in a current mode, and a weak galvanometer 9 is adopted to record the output current of the detector 3 under the irradiation of the radioactive source 1 in real time.
(2) And starting real-time measurement, and obtaining a change curve of the output current of the detector 3 along with the irradiation time after measuring the irradiation time. Normalizing the variation curve of the output current of the detector 3 along with the irradiation time to obtain a relative light output variation curve of the scintillator 4 to be detected, calculating the irradiation dose of the scintillator 4 to be detected, and obtaining the relative light output variation curve by multiplying the irradiation time by the irradiation dose rate; therefore, the change curve of the output current of the detector 3 along with the irradiation time can be converted into the change curve of the scintillator 4 to be detected relative to the light output along with the irradiation dose, and the curve represents the real-time change condition of the anti-irradiation performance of the scintillator 4 to be detected in the irradiation dose range.
(3) Performance prediction: and fitting the curve by using an exponential function to obtain a relational expression of the relative light output of the scintillator 4 to be detected changing along with the irradiation dose, so that the relative light output change of the scintillator 4 to be detected under any irradiation dose can be calculated in a certain range, and the prediction of the anti-irradiation performance of the scintillator 4 to be detected under the target irradiation dose is realized.
The embodiment of the scintillator irradiation dose prediction method of the invention is as follows:
according to
By fitting the relation, the relative light output of the scintillator 4 to be measured at a higher irradiation dose can be calculated. In order to obtain the relative light output of the scintillator 4 (lanthanum bromide crystal) to be detected with the irradiation dose of 400 Gy;
firstly, calculating the irradiation time required for reaching a target irradiation dose to be 400/25=16 hours under the current irradiation dose rate;
then, t =16 hours are substituted
And fitting the relation, and calculating to obtain that when the irradiation dose reaches 400Gy, the relative light output of the scintillator 4 to be detected is reduced to about 93.0%.
In order to verify the accuracy of the prediction result, the scintillator 4 to be detected is continuously irradiated under the same experiment condition, and when the irradiation dose reaches about 400Gy measured by the experiment, the relative light output of the scintillator 4 to be detected is 93.1%, which is basically consistent with the calculation result. Therefore, the method can predict the anti-irradiation performance of the scintillator 4 to be detected under higher dose based on the experimental result of the target irradiation dose, effectively save irradiation time, improve operation efficiency and reduce cost.
Claims (10)
1. A real-time measurement method for radiation resistance of a scintillator is characterized by comprising the following steps:
a1 Constructing a real-time measurement system for the radiation resistance of the scintillator;
the real-time measurement system for the radiation resistance of the scintillator comprises a radioactive source (1), a detector (3), an ammeter (9) and a power supply (8);
the detector (3) comprises a photoelectric device (5) arranged on a light emitting route of the scintillator (4) to be detected;
the scintillator (4) to be detected is positioned on a ray emergent path of the radioactive source (1);
the photoelectric device (5) is positioned on a light emitting path of the scintillator (4) to be detected;
the photoelectric device (5) is respectively connected with an ammeter (9) and a power supply (8);
a2 A detector (3) containing a scintillator (4) to be detected is placed on a ray emitting route of a radioactive source (1), the output current of the detector (3) under the irradiation of the radioactive source (1) is recorded in real time, and a change curve of the output current of the detector (3) along with irradiation time is obtained;
a3 Defining the relative light output of the scintillator (4) to be detected corresponding to the current at the initial moment of the detector (3) under the irradiation of the radioactive source (1) to be 100 percent;
normalizing the change curve of the output current of the detector (3) along with the irradiation time to obtain a relative light output change curve of the scintillator (4) to be detected;
a4 Calculating the irradiation doses corresponding to different irradiation times of the scintillator (4) to be measured in the relative light output change curve of the scintillator (4) to be measured, obtaining the change curve of the relative light output of the scintillator (4) to be measured along with the irradiation doses, and completing the real-time measurement of the anti-irradiation performance of the scintillator (4) to be measured.
2. The method for measuring the radiation resistance of the scintillator in real time according to claim 1, wherein the step A4) is specifically as follows:
a4.1, measuring by using a dosimeter to obtain the gamma irradiation dose rate at the detector (3) or calculating the gamma irradiation dose rate at the position of the detector (3) according to the intensity of the radioactive source (1);
and A4.2, multiplying the gamma irradiation dose rate obtained in the step A4.1 by the irradiation time in the relative light output change curve of the scintillator (4) to be detected to obtain the irradiation dose of the scintillator (4) to be detected at each time, and further obtaining the change curve of the relative light output of the scintillator (4) to be detected along with the irradiation dose.
3. The method for measuring the radiation resistance of the scintillator in real time according to claim 2, wherein in the step A2), the output current of the real-time recording detector (3) under the irradiation of the radiation source (1) is specifically:
and a weak current meter (9) is adopted to record the output current of the detector (3) under the irradiation of the radioactive source (1) in real time.
4. The method for measuring the radiation resistance of the scintillator in real time according to claim 3, wherein in the step A3), the normalization processing specifically comprises:
and performing normalization processing by using an index function, wherein the term number of the index function corresponds to the number of the irradiation defect types of the scintillator (4) to be detected.
5. The method for measuring the radiation resistance of the scintillator in real time according to claim 4, wherein in the step A1), the system for measuring the radiation resistance of the scintillator further comprises a collimation shield (2) arranged between the radioactive source (1) and the detector (3);
the collimation shielding device (2) is provided with a pore passage for ray collimation of the radioactive source (1);
the photoelectric device (5) is connected with a power supply (8) through a high-voltage cable (6);
the photoelectric device (5) is connected with an ammeter (9) through a signal cable (7).
6. The real-time measurement method for the radiation resistance of the scintillator according to claim 5, characterized in that: in the step A1), the radioactive source (1) is a cobalt source or a cesium source;
the scintillator (4) to be detected is a lanthanum bromide crystal;
the photoelectric detector (3) is a photoelectric tube or a photomultiplier tube;
the ammeter (9) is a weak ammeter.
7. A scintillator radiation resistance performance prediction method is characterized by comprising the following steps:
b1 Irradiating the scintillator (4) to be measured to be lower than the target irradiation dose, and acquiring a variation curve of the relative light output of the scintillator (4) to be measured with the irradiation dose by adopting the real-time measurement method for the radiation resistance of the scintillator according to any one of claims 1 to 6;
b2 Fitting a change curve of the relative light output of the scintillator (4) to be detected obtained in the step B1) along with the irradiation dose to obtain a relational expression of the relative light output of the scintillator (4) to be detected and the irradiation time or the irradiation dose;
b3 Substituting the target irradiation dose into the relational expression obtained in the step B2) to obtain the relative light output of the scintillator (4) to be detected, and realizing the prediction of the anti-irradiation performance of the scintillator (4) to be detected under the target irradiation dose.
8. The method for predicting the radiation resistance of the scintillator according to claim 7, wherein in the step B2), the relation between the relative light output and the irradiation time of the scintillator (4) to be tested is specifically as follows:
in the formula, L (t) is relative light output of t irradiation time of the scintillator (4) to be detected, t is irradiation time, and L 0 The relative light output of the scintillator (4) to be measured corresponding to the current at the initial time is 100 percent, L 0 ＝1；a 1 、a 2 、τ 1 、τ 2 Fitting constants of a relation between the relative light output and the irradiation time of the scintillator (4) to be detected;
or the relation between the relative light output and the irradiation dose of the scintillator (4) to be detected is as follows:
wherein L (D) is the relative light output of the irradiation dose of the scintillator (4) D to be measured, a 11 、a 22 、τ 11 、τ 22 Are fitting constants of a relational expression of the scintillator (4) to be detected relative to light output and irradiation dose.
9. The method for predicting the radiation resistance of the scintillator according to claim 8, wherein in step B1), the step of irradiating the scintillator (4) to be tested to a dose lower than the target irradiation dose specifically comprises:
and irradiating the scintillator (4) to be detected to 1/10 of the target irradiation dose.
10. The method for predicting the radiation resistance of the scintillator according to claim 9, wherein:
in step B2), the irradiation dose D is
D＝tΦ
Where Φ is the irradiation dose rate.
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