CN108398707B - Energy compensation method and device - Google Patents
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Abstract
The application provides an energy compensation method and a device, which relate to the technical field of radiation measurement and comprise the following steps: the processing device acquires corresponding energy response values according to the counting rate values of the different energy dose fields; the processing device divides the energy response values of the different energy dose fields into n energy areas; the processing means according to d=a 1 *C 1 +a 2 *C 2 +…a n *C n Weighting the count values of the different energy regions to achieve compensation of the count values of the different energy regions to reduce the energy response of a personal dosimeter provided with the energy compensation device relative to 137 Response bias of Cs, where n represents the number of energy regions, C 1 、C 2 …C n Respectively the count values in the energy regions, a 1 、a 2 …a n And the weight coefficient corresponding to each energy region is respectively adopted. The sensitivity of the CZT detector is increased while the energy response deviation meeting the national standard requirement is ensured, the measurement accuracy is improved, the weight and the volume of the whole personal dosimeter are reduced, and the instrument is convenient to carry.
Description
Technical Field
The application relates to the technical field of radiation measurement, in particular to an energy compensation method and device.
Background
Currently, the main probe parts of the personal dosimeter in the market are mainly a G-M tube and a silicon diode, and the application of the two types of personal dosimeters is greatly limited due to the fact that the G-M tube has larger dead time and lower detection efficiency on gamma rays, and meanwhile, the silicon diode has poorer angular response and lower detection efficiency on gamma rays. The novel CZT semiconductor detector is an ideal personal dosimeter because of the characteristics of high resistivity, large atomic number, capability of working at room temperature and the like.
According to national standard requirements of related personal dosimeters, the energy response of the personal dosimeters deviates by less than +/-30% from the response of Cs within the energy range of 50 keV-1.5 MeV. Experiments have shown that the maximum dose response for a typical CZT detector is about 50 times the Cs response over the 50keV to 1.5MeV energy range.
Disclosure of Invention
In view of the above, the embodiments of the present application provide an energy compensation method and apparatus to solve the above-mentioned problems.
In a first aspect, an embodiment of the present application provides an energy compensation method, applied to an energy compensation device, the method including: the heavy metal layer attenuates the X-rays or gamma-rays passing through different energy dose fields; the processing device converts signals generated by X rays or gamma rays of different energy dose fields attenuated by the heavy metal layer in the CZT detector into count values; the processing device acquires corresponding energy response values according to the counting rate values of the different energy dose fields; the processing device divides the energy response values of the different energy dose fields into n energy areas; the processing means is according to d=d=a 1 *C 1 +a 2 *C 2 +…a n *C n Weighting the count values of the different energy regions to compensate the count values of the different energy regions so as to reduce the energy response of the personal dosimeter provided with the energy compensation device relative to the energy response of the personal dosimeter 137 Response bias of Cs, where n represents the number of energy regions, C 1 、C 2 …C n Respectively the count values in the energy regions, a 1 、 a 2 …a n And the weight coefficient corresponding to each energy region is respectively adopted.
In a second aspect, an embodiment of the present application provides an energy compensation device, where the energy compensation device includes a heavy metal layer, a CZT detector, and a processing device, where the CZT detector is disposed between the heavy metal layer and the processing device. The heavy metal layer is provided with at least one through hole, and the heavy metal layer is used for attenuating X rays and gamma rays passing through the heavy metal layer. The CZT detector is used for enabling X-rays or gamma-rays of different energy dose fields to generate voltage signals after being attenuated by the heavy metal layer; the processing device is used for acquiring energy values of different energy dose fields and voltage numbers corresponding to the different energy values respectively and converting the voltage signals into counting rate values and energy response values; dividing energy response values of different energy dose fields into n energy regions; according to d=a 1 *C 1 +a 2 *C 2 +…a n *C n Weighting the counting values of different energy areas to realize the compensation of the counting values of different energy areas so as to reduce the settingEnergy response of a personal dosimeter having the energy compensation device relative to 137 Cs response bias, where n represents the number of energy regions, C 1 、C 2 …C n Respectively the count values in the energy regions, a 1 、a 2 …a n And the weight coefficient corresponding to each energy region is respectively adopted.
In a preferred embodiment of the present application, the heavy metal layer is one of Pb, sn, W, cu or Al metal layer.
In a preferred embodiment of the present application, the heavy metal layer is Pb with a thickness of 0.5-3 mm.
In a preferred embodiment of the application, the CZT detector is a CZT semiconductor detector with the thickness of 1-5 mm.
In a preferred embodiment of the present application, the energy compensation device further comprises a housing, and the heavy metal layer, the CZT detector and the processing device are all disposed in the housing.
The energy compensation method and the device provided by the embodiment of the application, the processing device receives the voltage signals generated by the X-rays or the gamma-rays of the dosage field attenuated by the heavy metal layer under different energies, obtains the count value and the energy response value through the voltage signals, partitions the energy response value, and weights the partitioned count value, thereby realizing the compensation of the count values of different energy areas, and leading the energy response of the personal dosimeter provided with the energy compensation device to be relative to that of the personal dosimeter 137 The response deviation of Cs is less than +/-20%, the energy compensation method provided by the embodiment of the application can reduce the thickness of the metal in the heavy metal layer while ensuring that the energy response deviation required by the national standard is met, and ensure that the energy response deviation required by the national standard can be met only by one metal, thereby increasing the sensitivity of the CZT detector, improving the measurement precision and reducing the weight and the volume of the whole personal dosimeter. Is convenient for carrying the instrument.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 shows a block schematic diagram of an electronic device according to an embodiment of the present application;
fig. 2 is a schematic structural view showing an energy compensating device according to a first embodiment of the present application;
FIG. 3 is a flow chart showing the steps of a method for energy compensation according to a second embodiment of the present application;
fig. 4 is a flowchart showing specific steps of step S320 of the energy compensation method according to the second embodiment of the present application;
fig. 5 shows a graph of calculated response values versus energy for count values of different energy regions.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, fig. 1 shows a block diagram of an electronic device 100 that can be applied to an energy compensation method and apparatus provided in an embodiment of the present application.
As shown in fig. 1, the electronic device 100 includes a memory 101, a memory controller 102, one or more (only one is shown in the figure) processors 103, a peripheral interface 104, a radio frequency module 105, a display module 106, and the like. These components communicate with each other via one or more communication buses/signal lines 107.
The memory 101 may be used to store software programs and modules, such as program instructions/modules corresponding to the energy compensation methods and apparatus of the present application, and the processor 103 executes the software programs and modules stored in the memory 101 to perform various functional applications and data processing, such as the energy compensation methods provided by the embodiments of the present application.
Memory 101 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. Access to the memory 101 by the processor 103, as well as other possible components, may be under the control of the memory controller 102.
A peripheral interface 104 couples various input/output devices to the processor 103 and the memory 101. In some embodiments, the peripheral interface 104, the processor 103, and the memory controller 102 may be implemented in a single chip. In other examples, they may be implemented by separate chips.
The rf module 105 is configured to receive and transmit electromagnetic waves, and to implement mutual conversion between the electromagnetic waves and the electrical signals, so as to communicate with a communication network or other devices.
The display module 106 provides a display interface between the server 100 and the user. In particular, the display module 106 displays image outputs to a user, the content of which may include text, graphics, video, and any combination thereof.
It is to be understood that the configuration shown in fig. 1 is merely illustrative, and that electronic device 100 may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1. The components shown in fig. 1 may be implemented in hardware, software, or a combination thereof.
In recent years, the development of nuclear science and technology brings great benefits to people, and simultaneously, potential ionizing radiation damage to human bodies also brings great potential harm to people. Especially after the nuclear accident of the Japanese Fu island, people pay more attention to radiation safety. Monitoring of the radiation dose is therefore of particular importance. And the dose rate meter for radiation dose measurement is an indispensable instrument in radiation monitoring and radiation protection.
The main probe parts of the personal dosimeter in the current market are mainly a G-M tube and a silicon diode, and the application of the two types of personal dosimeters is greatly limited due to the fact that the G-M tube has larger dead time and lower detection efficiency on gamma rays, and meanwhile, the silicon diode has poorer angular response and lower detection efficiency on gamma rays. The CZT detector is an ideal personal dose rate meter because of the characteristics of high resistivity, large atomic number, capability of working at room temperature and the like.
The energy response of the personal dose rate meter is relative to that of the related national standard within the energy range of 50keV to 1.5MeV 137 The response deviation of Cs is less than + -30%. In practical use, the maximum dose response for a typical CZT detector is about 50keV to 1.5MeV 137 The response of Cs is 50 times that of Cs, and the Cs does not meet the requirements of the relevant national standards.
Traditional energy compensation arrangement reduces the energy response deviation of CZT detector through increasing heavy metal layer, and traditional energy compensation arrangement only carries out energy compensation through heavy metal layer, needs multilayer heavy metal layer, needs multiple heavy metal layer moreover for sensitivity, the measurement accuracy of CZT detector reduce, have increased weight and the volume of instrument, inconvenient instrument's carry, simultaneously, have increased the error that brings because heavy metal layer's machining precision.
In order to improve the problem, the inventor provides an energy compensation method and an energy compensation device provided by the embodiment of the application through long-term research and continuous exploration.
First embodiment
Referring to fig. 2, a schematic structure of an energy compensation device 200 according to a first embodiment of the application is shown. The energy compensation device 200 includes a heavy metal layer 210, a CZT detector 220, and a treatment device 230, the CZT detector 220 being disposed between the heavy metal layer 210 and the treatment device 230, the CZT detector 220 being coupled to the treatment device 230.
The heavy metal layer 210 is provided with a plurality of through holes, and the heavy metal layer 210 is used for attenuating the X-rays and gamma-rays passing through the heavy metal layer 210. The heavy metal layer 210 may be selected from one of stainless steel, aluminum, copper, lead, tin, or tungsten. The thickness of the metal layers of different materials and the number and the size of the through holes are different. As an embodiment, the heavy metal layer 210 is Pb with a thickness of 0.5-3 mm.
The CZT detector 220 is used to generate voltage signals for X-rays or gamma-rays of different energy dose fields after attenuation by the heavy metal layer 210. As one embodiment, the CZT detector 220 is a CZT semiconductor detector with a thickness of 1 mm-5 mm
The processing device 230 is configured to obtain energy values of different energy dose fields and voltage signals corresponding to the different energy values, and convert the voltage signals into a count value and an energy response value; dividing energy response values of different energy dose fields into n energy regions; according to d=a 1 *C 1 +a 2 *C 2 +…a n *C n Weighting the count values of the different energy zones to achieve compensation of the count values of the different energy zones to reduce the energy response of the personal dosimeter provided with the energy compensation device 200 relative to 137 Response bias of Cs, where n represents the number of energy regions, C 1 、C 2 …C n Respectively the count rates in the energy regionsValue of a 1 、a 2 …a n And the weight coefficient corresponding to each energy region is respectively adopted.
Further, the energy compensation device 200 further includes a housing, and the heavy metal layer 210, the CZT detector 220, and the processing device 230 are disposed in the housing.
The energy compensation device 200 provided by the embodiment of the application is provided with the heavy metal layer 210, the CZT detector 220 and the processing device 230, the compensation of the counting rate value measured by the CZT detector 220 is realized through the processing device 230, the thickness of metal in the heavy metal layer 210 is reduced while the energy response deviation meeting the national standard requirement is ensured, and the energy response deviation meeting the national standard requirement can be met only by one metal, so that the sensitivity of the CZT detector 220 is increased, the measurement precision is improved, and the weight and the volume of the whole personal dosage meter are reduced. Is convenient for carrying the instrument. In addition, the detection range of the energy compensation device 200 provided by the embodiment of the application is also larger, and the radiation in the low band, for example, 20kev, can be detected and processed.
Second embodiment
Referring to fig. 3, a flowchart of steps of an energy compensation method 300 according to a second embodiment of the present application is shown. The energy compensation method 300 provided by the embodiment of the present application is applied to the energy compensation device 200 provided by the first embodiment. The energy compensation method 300 provided in this embodiment will be described in detail with reference to fig. 3.
In step S310, the heavy metal layer attenuates the X-rays or gamma-rays passing through the different energy dose fields.
Conventional energy compensation devices implement energy response compensation for CZT detectors by providing multiple layers of heavy metals in the CZT detector. In this embodiment, only one heavy metal layer is provided for compensation, and the heavy metal layer and the processing device jointly implement energy compensation.
In step S320, the processing device converts the signals generated by the X-rays or gamma-rays of the different energy dose fields attenuated by the heavy metal layer in the CZT detector into count values.
X-rays or gamma-rays in dose fields with different energies are attenuated by a heavy metal layer, and then are subjected to a CZT detector to generate signals, such as voltage signals, the voltage signals are converted into counting values by a processing device, and the specific generation steps of the counting values are as follows:
referring to fig. 4, step S330 specifically includes:
in step S321, the processing device acquires voltage signals generated by the X-rays or gamma-rays of different energy dose fields attenuated by the heavy metal layer in the CZT detector.
In step S322, the processing device converts the voltage signals corresponding to the X-rays or γ -rays of the different energy dose fields into digital signals, and converts the digital signals into count values.
X-rays or gamma-rays of different energy dose fields firstly pass through a heavy metal layer, enter a CZT detector after being attenuated by the heavy metal layer, generate different voltage signals in the CZT detector, amplify and shape the voltage signals by a processing device to obtain Gaussian waveform signals corresponding to the voltage signals, carry out analog-to-digital conversion on the Gaussian waveform signals to obtain digital signals, and carry out shaping filtering and other treatments on the obtained digital signals to obtain counting values of the different energy dose fields.
In step S330, the processing device obtains a corresponding energy response value according to the count values of the different energy dose fields.
The processing device acquires energy response values of the different energy dose fields according to the counting rate values of the different energy dose fields.
In step S340, the processing device divides the energy response values of the different energy dose fields into n energy regions.
And obtaining energy response values of different energy dose fields, and partitioning according to the energy response values. As one embodiment, the different energy information is divided into n energy regions, each energy region comprising a plurality of different energy values and respective count values for the different energy values, preferably 2.ltoreq.n.ltoreq.6.
In step S350, the weight coefficients of the different energy regions are calculated.
The energy response values of the different energy dose fields are divided into n energy regions, namely a first energy region, a second energy region, … … and an nth energy region.
First energy region coefficient a 1 The determining method of (1) comprises the following steps: placing the energy compensation device in a standard field of a first energy region, wherein the standard field dosage rate value X of the first energy region 1 Is determined, C 1 For the count value of the first energy region, since there are a plurality of count values for each energy region, as an embodiment, an average value C of a plurality of count values in the first energy region may be taken 1 Then according to the formulaAnd (5) calculating.
Second energy region coefficient a 2 The determining method of (1) comprises the following steps: placing the energy compensation device in a standard field of a second energy region, wherein the standard field dosage rate value X of the second energy region 2 Also of a determined value, C 2 For the count value of the second energy region, the average value of the count values in the second energy region can be taken as C 2 Then according to the formulaAnd (5) calculating.
N-th energy region coefficient a n The determining method of (1) comprises the following steps: placing the energy compensation device in a standard field of an nth energy region, wherein the standard field dosage rate value X of the nth energy region n Also of a determined value, C n For the count value of the nth energy region, the average value of a plurality of count values in the nth energy region can be taken as C n Then according to the formulaAnd (5) calculating.
Step S360, according to d=a 1 *C 1 +a 2 *C 2 +…a n *C n Weighting the count rate values of the different energy regions to compensate the count rate values of the different energy regions so as to reduce the energy response of the personal dosimeter provided with the energy compensation device relative to that of the personal dosimeter 137 The response bias of Cs is such that,wherein n represents the number of energy regions, C 1 、C 2 …C n The counting rate value of each energy zone, a 1 、a 2 … a n And the weight coefficient corresponding to each energy region is respectively adopted.
For example, the counting values of different energies are divided into three energy regions, and the weight coefficient of the first energy region isThe weight coefficient of the second energy region is +.>The third energy region weight coefficient is +.>After the weight coefficients of the three energy areas are obtained, the counting value of each energy area needs to be obtained, and the average value C of a plurality of counting values can be taken as a plurality of counting values of each energy area 1 、C 2 C 3 C is carried out by 1 、C 2 、C 3 A) 1 、a 2 、a 3 Carry d=a 1 *C 1 +a 2 *C 2 +…a n *C n 。
By weighting the dose rate values of different energies, the compensation of the dose rate values is achieved, and referring to fig. 5, fig. 5 is a graph of the response values calculated for the count rate values of different energy regions and the energy, where the weighting method according to the embodiment is not used, and far exceeds the relevant national standard. After the attenuation of the heavy metal layer is used, although the response error is greatly reduced, the maximum response value still far exceeds the value required by the national standard, and after the weighting of the energy compensation method provided by the embodiment, it can be obtained that the response values of different energy values all meet the range required by the national standard, and the energy response is relative to the energy 137 The response bias of Cs is less than + -20%.
The energy compensation method provided by the embodiment of the application carries out the X-ray or gamma-ray generation count value of the dosage field attenuated by the heavy metal layer under different energiesPartitioning, and weighting the partitioned count values to realize the compensation of the count values of different energy regions, so that the energy response of the personal dosimeter provided with the energy compensation device is relative to that of the personal dosimeter 137 The response deviation of Cs is less than +/-20%.
In summary, the method and the device for energy compensation provided by the embodiments of the present application receive voltage signals generated by attenuating X-rays or γ -rays of a dose field under different energies by a heavy metal layer, obtain count values through the voltage signals, partition the count values, and weight the partitioned count values, thereby realizing compensation of the count values of different energy regions, and enabling the energy response of a personal dosimeter provided with the energy compensation device to be relative to that of a personal dosimeter 137 The response deviation of Cs is less than 20%, the energy compensation method provided by the embodiment of the application can reduce the metal thickness in the heavy metal layer while ensuring that the energy response deviation required by the national standard is met, and ensure that the energy response deviation required by the national standard can be met only by one metal, thereby increasing the sensitivity of the CZT detector, improving the measurement precision and reducing the weight and the volume of the whole personal dosimeter. Is convenient for carrying the instrument.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, and identical and similar parts between the embodiments are referred to each other. For the apparatus class embodiments, the description is relatively simple as it is substantially similar to the method embodiments, and reference is made to the description of the method embodiments for relevant points.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, for example, of the flowcharts and block diagrams in the figures that illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes. It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the scope of the present application is intended to be covered by the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. An energy compensation method, applied to an energy compensation device, the method comprising:
the heavy metal layer attenuates the X-rays or gamma-rays passing through different energy dose fields;
the processing device converts signals generated by X rays or gamma rays of different energy dose fields attenuated by the heavy metal layer in the CZT detector into count values;
the processing device acquires corresponding energy response values according to the counting rate values of the different energy dose fields;
the processing device divides the energy response values of the different energy dose fields into n energy areas;
the processing means according to d=a 1 *C 1 +a 2 *C 2 +…a n *C n Weighting the count values of the different energy regions to achieve compensation of the count values of the different energy regions to reduce the energy response of a personal dosimeter provided with the energy compensation device relative to 137 Response bias of Cs, where n represents the number of energy regions, C 1 、C 2 …C n Respectively the count values in the energy regions, a 1 、a 2 …a n The weight coefficient corresponding to each energy region is respectively;
wherein the processing means is according to d=a 1 *C 1 +a 2 *C 2 +…a n *C n Weighting the count values of the different energy regions to achieve compensation of the count values of the different energy regions to reduce the energy response of a personal dosimeter provided with the energy compensation device relative to 137 Before the step of Cs response bias, the method further includes:
the weight coefficients of the different energy regions are calculated, wherein,
X 1 for a standard field dose rate value, X, for the first energy region 2 For the standard field dose rate value, X, of the second energy region 3 Is the standard field dose rate value for the third energy region.
2. The method of claim 1, wherein the processing means divides the energy response values of the different energy dose fields into n energy regions steps comprising:
the processing device divides the energy response values of the different energy dose fields into n energy regions, wherein n is more than or equal to 2 and less than or equal to 6.
3. The method according to claim 1, wherein the step of the processing means converting signals generated in the CZT detector by X-rays or gamma-rays of different energy dose fields attenuated by the heavy metal layer into count values comprises:
the processing device acquires voltage signals generated by X-rays or gamma-rays of different energy dose fields attenuated by the heavy metal layer in the CZT detector;
the processing device converts voltage signals corresponding to the X-rays or gamma-rays of the different energy dose fields into digital signals and converts the digital signals into counting rate values.
4. The energy compensation device is characterized by comprising a heavy metal layer, a CZT detector and a processing device, wherein the CZT detector is arranged between the heavy metal layer and the processing device;
the heavy metal layer is provided with at least one through hole, and the heavy metal layer is used for attenuating X rays and gamma rays passing through the heavy metal layer;
the CZT detector is used for enabling X-rays or gamma-rays of different energy dose fields to generate voltage signals after being attenuated by the heavy metal layer;
the processing device is used for acquiring energy values of different energy dose fields and voltage numbers corresponding to the energy values of the energy dose fields respectively and converting the voltage signals into counting values and energy response values; dividing energy response values of different energy dose fields into n energy regions; according to d=a 1 *C 1 +a 2 *C 2 +…a n *C n Weighting the count values of the different energy regions to achieve compensation of the count values of the different energy regions to reduce the energy response of a personal dosimeter provided with the energy compensation device relative to 137 Response bias of Cs, where n represents the number of energy regions, C 1 、C 2 …C n Respectively the count values in the energy regions, a 1 、a 2 …a n The weight coefficient corresponding to each energy region is respectively;
wherein the processing device is further configured to: the weight coefficients of the different energy regions are calculated, wherein,
X 1 for a standard field dose rate value, X, for the first energy region 2 For the standard field dose rate value, X, of the second energy region 3 Is the standard field dose rate value for the third energy region.
5. The energy compensating device of claim 4, wherein the heavy metal layer is one of Pb, sn, W, cu or an Al metal layer.
6. The energy compensating device of claim 5, wherein the heavy metal layer is Pb having a thickness of 0.5-3 mm.
7. The energy compensating apparatus of claim 4 wherein the CZT detector is a CZT semiconductor detector having a thickness of 1mm to 5 mm.
8. The energy compensating device of claim 4, further comprising a housing, wherein the heavy metal layer, CZT detector, and the processing device are disposed within the housing.
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| US20120175509A1 (en) * | 2011-01-11 | 2012-07-12 | General Electric Company | Gamma camera calibration methods and systems |
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| US9020092B2 (en) * | 2013-02-19 | 2015-04-28 | Kabushiki Kaisha Toshiba | Apparatus and method for angular response calibration of photon-counting detectors in sparse spectral computed tomography imaging |
| EP2994051B1 (en) * | 2013-05-10 | 2018-08-29 | Koninklijke Philips N.V. | Photon-counting detector calibration |
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