Measuring device and dose rate value energy response compensation method
By using detectors and signal processing modules with different effective areas in the measuring device, and employing a count rate compensation method, the accuracy problem of converting gamma ray count rates of different energies into dose rates was solved, thus achieving high-precision measurement of dose rate values.
Patent Information
- Application Number
- CN202511021697.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-23
- Publication Date
- 2025-10-17
AI Technical Summary
In ionizing radiation dose rate measurement, gamma rays of different energies produce different event count rates at the same dose rate level, resulting in significant differences in the results when the count rate is multiplied by a single coefficient to convert it into dose rate, leading to poor measurement accuracy.
By employing a scintillator and at least two detectors with different effective areas and a signal processing module, the count rate of each detector is obtained, and energy response compensation is performed using compensation coefficients and formulas to obtain an accurate dose rate value.
By complementing the response differences of particles with different energies, measurement bias is reduced and the accuracy of dose rate measurements is improved.
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Figure CN120802322A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of radioactive ray radiation dose measurement, in particular to a measuring device and an energy response compensation method of dose rate value. BACKGROUND
[0002] In the field of ionizing radiation dose rate measurement, scintillator and detector combination is a common probe design. However, due to the different interaction cross sections of gamma rays of different energies with the scintillator, the event count rate generated by gamma rays of different energies is different at the same dose rate level. When the count rate is multiplied by a single coefficient to convert it into dose rate, the results differ significantly, which further leads to poor accuracy of the measured dose rate value. SUMMARY
[0003] Therefore, the main purpose of the embodiments of the present application is to provide a measuring device and an energy response compensation method of dose rate value with good accuracy.
[0004] To achieve the above purpose, the technical scheme of the embodiments of the present application is as follows:
[0005] The embodiments of the present application provide a measuring device, comprising:
[0006] a scintillator, the scintillator being used to convert particle energy into optical signals;
[0007] at least two detectors with different effective areas, the scintillator being signal connected with each of the detectors, the detector being used to convert the optical signals into electrical signals;
[0008] a signal processing module, the signal processing module being signal connected with each of the detectors to obtain a dose rate value after energy response compensation.
[0009] In an embodiment, the detector comprises a first detector and a second detector.
[0010] The effective area of the first detector is greater than or equal to 1mm 2 and less than or equal to 4mm 2 ; and / or,
[0011] The effective area of the second detector is greater than or equal to 9mm 2 and less than or equal to 36mm 2 .
[0012] In an embodiment, the scintillator has a connecting surface in contact with the detector, and the connecting surface is a smooth surface.
[0013] In an embodiment, the scintillator is coated with a light-reflecting layer on each surface except the connecting surface.
[0014] In one embodiment, the material of the light-reflecting layer is titanium dioxide or magnesium oxide.
[0015] In one embodiment, the signal processing module comprises a plurality of signal processing circuits, the number of the signal processing circuits corresponding to the number of the detectors.
[0016] In one embodiment, the signal processing circuit comprises an amplifier, a comparator and a counter, the amplifier being connected to the detector and the comparator, the comparator having an output end, and the counter having an input end, the input end of the counter being connected to the output end of the comparator to receive the signal output by the comparator and count.
[0017] In another aspect, the present application provides a method for energy response compensation of dose rate values, which is used in the measurement device described above, and comprises the following steps:
[0018] Obtaining the count rates of the detectors;
[0019] Obtaining the energy response compensated dose rate values according to the count rates.
[0020] In one embodiment, the step of obtaining the energy response compensated dose rate values according to the count rates comprises the following steps:
[0021] Converting the count rates of the detectors into dose rates by using a compensation coefficient;
[0022] Compensating the dose rates of the detectors with small effective areas by using a compensation relationship to obtain compensated dose rates, wherein the compensation relationship is a function relationship related to the ratio of the count rates of the detectors;
[0023] Obtaining the energy response compensated dose rate values according to the compensated dose rates and the dose rates of the detectors with large effective areas.
[0024] In one embodiment, under a standard field dose field, a plurality of first count rates, second count rates and dose rate values are obtained according to radioactive rays corresponding to different energies, and the compensation coefficient and the compensation relationship are obtained by fitting the first count rates, the second count rates and the dose rate values, wherein the first count rates are the count rates of the detectors with small effective areas, and the second count rates are the count rates of the detectors with large effective areas.
[0025] The embodiment of the present application provides a kind of measuring device and dose rate value energy response compensation method, measuring device includes scintillator, at least two effective area different detector and signal processing module.Scintillator is used to convert particle energy into optical signal, scintillator is connected with each detector signal respectively, detector is used to convert optical signal into electrical signal, signal processing module is connected with each detector signal, to obtain energy response compensated dose rate value.Therefore, the difference of response of different energy particles is complemented using the detector of different effective area, the measurement deviation caused by the difference of energy response characteristics of detector is reduced, to improve the accuracy of dose rate value measurement. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 It is a structure schematic view of a kind of measuring device for the embodiment of the present application;
[0027] Figure 2 It is a flow chart of a kind of dose rate value energy response compensation method for another embodiment of the present application.
[0028] REFERENCE SIGNS
[0029] 10, scintillator;20, detector;21, first detector;22, second detector;30, signal processing module;31, amplifier;32, comparator;33, counter. DETAILED DESCRIPTION
[0030] In this document, reference to“an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.
[0031] The embodiment of the present application provides a kind of measuring device, please refer to Figure 1 Measuring device includes scintillator 10, at least two effective area different detector 20 and signal processing module 30.
[0032] Scintillator 10 is used to convert particle energy into optical signal.
[0033] Scintillator 10 is connected with each detector 20 signal respectively, and detector 20 is used to convert optical signal into electrical signal.
[0034] Signal processing module 30 is connected with each detector 20 signal, to obtain energy response compensated dose rate value.
[0035] Specifically, the scintillator 10 is a component for receiving particles of radioactive rays and converting the energy of the particles into light signals that can be received by the detector 20 .
[0036] There is no limit to the type of radioactive rays.
[0037] Exemplarily, the radioactive rays are alpha rays.
[0038] Exemplarily, the radioactive rays are beta rays.
[0039] Exemplarily, the radioactive rays are gamma rays.
[0040] The detector 20 is a component for converting a received optical signal into an electrical signal that can be received by the signal processing module 30 .
[0041] The structure of the detector 20 is not limited.
[0042] For example, the detector 20 is a SiPM (Silicon Photomultiplier).
[0043] It should be noted that the effective areas of the detectors 20 are different, and detectors 20 with different effective areas respond differently to different energies. In low-energy radiation, the total number of photons generated by the scintillator 10 is relatively small, and the detectors 20 with smaller effective areas receive fewer photons. Therefore, the expected optical signal obtained by the detectors 20 with smaller effective areas is low, and the probability of triggering a discrimination count is relatively low. However, because the detectors 20 with larger effective areas have a larger receiving range, the probability of triggering a discrimination count is greater than that of the detectors 20 with smaller effective areas. In high-energy radiation, the total number of photons generated by the scintillator 10 is relatively large, and the probability of triggering a discrimination count by the detectors 20 with smaller effective areas increases. However, the response of the detectors 20 with larger effective areas to high-energy radiation changes more gradually (the increase in count rate is lower than that of the detectors 20 with smaller effective areas). This differentiated response allows the count rate ratio between detectors 20 with different effective areas to effectively reflect the energy characteristics of the radiation, providing a basis for targeted compensation of dose rate values at different energies.
[0044] The number of detectors 20 is not limited.
[0045] Exemplarily, the detector 20 includes a first detector 21 and a second detector 22 .
[0046] The effective area of the first detector 21 is not limited.
[0047] For example, the effective area of the first detector 21 is greater than or equal to 1 mm 2 , and less than or equal to 4mm 2 For example, the effective area of the first detector 21 is 1 mm 2 , 2mm 2 , 3mm2 or 4mm 2 .
[0048] The effective area of the second detector 22 is not limited.
[0049] For example, the effective area of the first detector 21 is greater than or equal to 9mm 2 and less than or equal to 36mm 2 . For example, the effective area of the first detector 21 is 9mm 2 , 18mm 2 , 27mm 2 or 36mm 2 .
[0050] It can be understood that the number of detectors 20 with different effective areas can also be set to three or more according to actual conditions.
[0051] For ease of description, the measurement device in the present application includes two detectors 20 with different effective areas.
[0052] The signal processing module 30 is used for processing the electrical signal output by the detector 20 and outputting the dose rate value after compensation.
[0053] The measurement device of the embodiment of the present application includes a scintillator 10, at least two detectors 20 with different effective areas and a signal processing module 30. The scintillator 10 is used for converting particle energy into an optical signal, the scintillator 10 is signal connected with each detector 20 respectively, the detector 20 is used for converting the optical signal into an electrical signal, and the signal processing module 30 is signal connected with each detector 20 to obtain the dose rate value after compensation. Thus, the difference in response of the detectors 20 with different effective areas to different energy particles is complemented, the measurement deviation caused by the difference in response characteristics of the detectors 20 is reduced, and the accuracy of the dose rate value measurement is improved.
[0054] In an embodiment, the scintillator 10 has a connecting surface in contact with the detector 20, and the connecting surface is a smooth surface. Thus, the smooth connecting surface can reduce the scattering and reflection of the optical signal in the transmission process, so that more optical signals can be received by the detector 20, thereby improving the measurement accuracy.
[0055] Specifically, the connecting surface refers to the surface of the scintillator 10 in contact with the detector 20, and the optical signal of the scintillator 10 is received by the detector 20 through the connecting surface.
[0056] The contact mode of the scintillator 10 with the detector 20 is not limited.
[0057] For example, the scintillator 10 is in optical coupling contact with the detector 20.
[0058] In an embodiment, the scintillator 10 is coated with a reflective layer on all surfaces except the connecting surface. In this way, the light signal of the scintillator 10 can be reduced from escaping from other non-connecting surfaces, affecting the technology of the detector 20, and thus leading to the risk of lower measurement accuracy.
[0059] Specifically, the material type of the reflective layer is not limited.
[0060] For example, the material type of the reflective layer is titanium dioxide or magnesium oxide.
[0061] In an embodiment, the signal processing module 30 includes a plurality of signal processing circuits, and the number of signal processing circuits corresponds to the number of detectors 20. In this way, by receiving the electrical signal of one detector 20 through one signal processing circuit, the mutual interference of signals of different detectors 20 in the circuit can be avoided, leading to the distortion of the count rate, and thus the accuracy of the measurement result can be improved.
[0062] Specifically, the signal processing circuit refers to a component for processing the electrical signal output by the detector 20 and compensating the electrical signal to obtain the compensated dose rate value.
[0063] In an embodiment, the signal processing circuit includes an amplifier 31, a comparator 32, and a counter 33. The amplifier 31 is respectively connected to the detector 20 and the comparator 32, the comparator 32 has an output end, and the counter 33 has an input end. The input end of the counter 33 is connected to the output end of the comparator 32 to receive the signal output by the comparator 32 and count. In this way, the quality of the electrical signal can be effectively improved, and the compensated dose rate value obtained is more accurate.
[0064] Specifically, the amplifier 31 is an electronic device or circuit that can amplify the amplitude of the input electrical signal.
[0065] The comparator 32 is an electronic device or circuit for signal discrimination, thereby eliminating invalid electrical signals. The comparator 32 compares the received electrical signal with a preset reference threshold value. If the amplitude of the electrical signal exceeds the reference threshold value, a pulse signal is output. If the amplitude of the electrical signal is lower than the threshold value, it is eliminated.
[0066] The counter 33 is an electronic device or circuit for counting the number of pulse signals output by the comparator 32.
[0067] Another embodiment of the present application provides a dose rate value energy-dependent compensation method for the measurement device of any one of the above, please refer to Figure 2 , the energy-dependent compensation method includes the following steps:
[0068] Step S1: Obtain the count rate of each detector 20.
[0069] Step S2: obtaining the energy response compensated dose rate value according to the count rates.
[0070] Specifically, when obtaining the count rate of each detector 20, the amplitude of the electrical signal output by the detector 20 is amplified by the amplifier 31, and then the electrical signal amplified by the amplifier 31 is discriminated by the comparator 32 to eliminate invalid electrical signals and noise signals and only keep valid pulse signals. Then, the number of valid pulses in a unit time is counted by the counter 33 to obtain the accurate count rate corresponding to each detector 20.
[0071] In an embodiment, obtaining the energy response compensated dose rate value according to the count rates specifically includes the following steps:
[0072] Step S1: converting the count rate of each detector 20 into a dose rate by a compensation coefficient.
[0073] Step S2: compensating the dose rate of the detector 20 with a smaller effective area by a compensation relationship to obtain a compensated dose rate; wherein the compensation relationship is a functional relationship related to the ratio of the count rates of each detector 20.
[0074] Step S3: obtaining the energy response compensated dose rate value according to the compensated dose rate and the dose rate of the detector 20 with a larger effective area.
[0075] Specifically, the compensation coefficient is a coefficient for converting the count rate of each detector 20 into a dose rate.
[0076] The type of the compensation coefficient is not limited.
[0077] For example, the compensation coefficient can be a constant.
[0078] For another example, the compensation coefficient can be a function.
[0079] The compensation relationship is a functional relationship for compensating the dose rate of the detector 20 with a smaller effective area.
[0080] The compensation relationship is a function related to the ratio of the count rate of the detector 20 with a smaller effective area and the count rate of the detector 20 with a larger effective area.
[0081] The type of the function of the compensation relationship is not limited.
[0082] For example, the compensation relationship is a linear function.
[0083] For another example, the compensation relationship is a quadratic function.
[0084] Of course, the compensation relationship can also be other types of functions.
[0085] It should be noted that the larger the effective area of the detector 20, the larger the area of the light signal received by the scintillator 10, the more photons captured per unit time, and thus the higher the count rate. However, when the intensity of the radioactive rays is too high, the detector 20 may not be able to accurately count the radioactive rays with higher energy due to pulse pile-up, insufficient response speed, and the like. The smaller the effective area of the detector 20, the fewer the number of photons received, the lower the count rate, and the more accurate the counting of radioactive rays with higher energy. Therefore, the dose rate of the detector 20 with a larger effective area is taken as a reference, and the dose rate of the detector 20 with a smaller effective area is compensated to obtain a compensated dose rate, and the compensated dose rate value obtained by the compensated dose rate and the dose rate of the detector 20 with a larger effective area has higher accuracy.
[0086] In an embodiment, under a standard dose field, a plurality of first count rates, second count rates, and dose rates are obtained according to radioactive rays of different energies, and each first count rate, each second count rate, and each dose rate value is fitted to obtain a compensation coefficient and a compensation relationship. The first count rate is the count rate of the detector 20 with a smaller effective area, and the second count rate is the count rate of the detector 20 with a larger effective area. Thus, the accuracy of the compensated dose rate value can be improved.
[0087] Specifically, the calculation formula of the compensated dose rate value is not limited according to the compensation coefficient and the compensation relationship.
[0088] For example, the calculation formula of the compensated dose rate value is Dr=a·Cb+a·Cs·F(x) according to the compensation coefficient and the compensation relationship.
[0089] Wherein, Dr is the compensated dose rate value; a is the compensation coefficient; Cb is the count rate of the detector 20 with a larger effective area (second count rate); Cs is the count rate of the detector 20 with a smaller effective area (first count rate); and F(x) is the compensation relationship.
[0090] Dr, Cb, and Cs are measured under a plurality of standard field dose fields, a and F(x) are obtained by fitting a plurality of Dr, Cb, and Cs, and then the count rate under different radioactive ray energy and intensity scenarios is processed by the calculation formula of the compensated dose rate value, the count rate of the detector 20 with a larger effective area (Cb) is used as a basis, combined with the count rate of the detector 20 with a smaller effective area (Cs) and the fitted a and F(x), and the compensated dose rate value is accurately calculated, thereby realizing accurate measurement of the dose rate of radioactive rays of the full energy range and different intensities, and effectively eliminating the measurement deviation caused by the response difference of the detector 20 to different energy rays.
[0091] In the description of the application, the description of the terms "in an embodiment", "in some embodiments", "in a specific embodiment", or "exemplary" and the like means that the specific feature, structure, material or characteristic being described is included in at least one embodiment or example of the application. The illustrative appearance of the above-mentioned terms in various places in the specification is not necessarily intended to refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the different embodiments or examples described in the application and the features of the different embodiments or examples can be combined with each other, if not mutually exclusive.
[0092] The above only describes the preferred embodiments of the application and is not intended to limit the application. The application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application is included in the protection scope of the application.
Claims
1. A measuring device, characterized in that: include: a scintillator, the scintillator being used to convert particle energy into a light signal; At least two detectors with different effective areas, the scintillators are respectively connected to the signals of the detectors, and the detectors are used to convert the optical signals into electrical signals; A signal processing module is connected to each of the detector signals to obtain a dose rate value after energy response compensation.
2. The measuring device according to claim 1, characterized in that The detector includes a first detector and a second detector; The effective area of the first detector is greater than or equal to 1 mm 2 , and less than or equal to 4mm 2 and / or, The effective area of the second detector is greater than or equal to 9mm 2 , and less than or equal to 36mm 2 .
3. The measuring device according to claim 1, characterized in that The scintillator has a connection surface in contact with the detector, and the connection surface is a smooth surface.
4. The measuring device according to claim 3, characterized in that All surfaces of the scintillator except the connecting surface are covered with a reflective layer.
5. The measuring device according to claim 4, characterized in that The material type of the reflective layer is titanium dioxide or magnesium oxide.
6. The measuring device according to claim 1, characterized in that The signal processing module includes a plurality of signal processing circuits, and the number of the signal processing circuits corresponds one-to-one to the number of the detectors.
7. The measuring device according to claim 6, characterized in that The signal processing circuit includes an amplifier, a comparator and a counter. The amplifier is respectively connected to the detector and the comparator signals. The comparator has an output end, and the counter has an input end. The input end of the counter is connected to the output end signal of the comparator to receive the signal output by the comparator and count.
8. A method for compensating the energy response of a dose rate value, used in the measuring device according to any one of claims 1 to 7, characterized in that: The energy response compensation method comprises the following steps: Obtaining a count rate of each of the detectors; A dose rate value after energy response compensation is obtained according to each of the counting rates.
9. The energy response compensation method according to claim 8, characterized in that: The step of obtaining the dose rate value after energy response compensation according to each of the counting rates specifically comprises the following steps: converting the count rate of each detector into a dose rate by using a compensation coefficient; Compensating the dose rate of the detector with a smaller effective area by a compensation relationship to obtain a compensated dose rate; wherein the compensation relationship is a functional relationship related to the ratio of the count rates of the detectors; A dose rate value after energy response compensation is obtained according to the compensated dose rate and the dose rate of the detector with a larger effective area.
10. The energy response compensation method according to claim 9, characterized in that: Under a standard field dose field, a plurality of first counting rates, second counting rates and dose rate values are obtained according to radioactive rays corresponding to different energies, and each of the first counting rates, each of the second counting rates and each of the dose rate values is fitted to obtain the compensation coefficient and the compensation relationship; wherein the first counting rate is the counting rate of the detector with a smaller effective area, and the second counting rate is the counting rate of the detector with a larger effective area.