A radiation measurement method and a radiation measurement system

Abstract

The present application discloses a radiation measurement method and a radiation measurement system. The radiation measurement method includes setting a first cross section at a first preset position, measuring a plurality of first radiation dose rate values and first coordinates along a first direction in the first cross section, and determining a first peak radiation dose rate value d 1max , along d 1max The second direction is measured with a plurality of second radiation dose rate values and a second coordinate, and a second peak radiation dose rate value d is determined. 2max , determine the diameter of the radiation output beam spot of the first section and the first center focal spot dose rate value d1 of the first section, set the second section at the second preset position, and repeat the above steps to determine the diameter of the radiation output beam spot of the second section and the second center focal spot dose rate value d2 of the second section, obtain the distribution of radiation dose rate values along the section, improve measurement efficiency and measurement accuracy, and reduce the risk of radiation exposure to operators due to human intervention during the radiation measurement process due to automated measurement.

Description

Technical Field

[0001] The present application relates to the technical field of radiation equipment detection, and in particular, to a radiation measurement method and a radiation measurement system. Background Art

[0002] During the verification or calibration of X-ray flaw detectors, it is necessary to measure the X-ray machine's radiation output, including the radiation angle and the distribution of the dose rate at a specific point along the beam's irradiation direction. However, in existing automated X-ray flaw detector verification devices, the initial scanning state still requires manual intervention. For example, the precise distance between the scanning device and the X-ray machine must be measured in advance using a tape measure. Furthermore, the axial dose rate distribution along the X-ray beam's exit direction cannot be determined, increasing the risk of radiation exposure to operators and reducing measurement efficiency. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a radiation measurement method and a radiation measurement system to solve the problems of the risk of workers being exposed to radiation and low measurement efficiency during radiation measurement.

[0004] In order to solve the above problems, this application adopts the following technical solutions:

[0005] This application provides a radiation measurement method, comprising:

[0006] S1. Setting a first cross section at a first preset position along the radiation output direction of the X-ray machine, wherein the first cross section is perpendicular to the radiation output direction of the X-ray machine and is within the radiation beam spot area of the X-ray machine;

[0007] S2. measuring a plurality of first radiation dose rate values at intervals along a first direction in the first cross section, and recording first coordinates of the plurality of first radiation dose rate values;

[0008] S3. Compare the multiple first radiation dose rate values to determine a first peak radiation dose rate value d 1max , and mark the first peak radiation dose rate value d 1max The first peak coordinate of the radiation dose rate is d 1max is the maximum value among the plurality of first radiation dose rate values;

[0009] S4. Taking the first peak coordinate as a starting point, measure a plurality of second radiation dose rate values at intervals along a second direction within the first cross-section, and record second coordinates of the plurality of second radiation dose rate values, wherein the second direction is perpendicular to the first direction, and both the second direction and the first direction are perpendicular to the radiation output direction of the X-ray machine;

[0010] S5. Compare the plurality of second radiation dose rate values to determine a second peak radiation dose rate value d 2max , and mark the second peak radiation dose rate value d 2max The second peak coordinates, the second peak radiation dose rate value d 2max The first center focal dose rate value d1 of the first cross section is recorded, wherein the second peak radiation dose rate value d 2max is the maximum value among a plurality of second radiation dose rate values;

[0011] S6, according to the plurality of second coordinates and the second peak radiation dose rate value d 2max , determining the diameter of the radiation output beam spot of the first cross section;

[0012] S7. Set a second cross-section at a second preset position along the radiation output direction of the X-ray machine, and repeat S2 to S6 to determine the diameter of the second radiation output beam spot and a second central focal spot dose rate value d2 of the second cross-section, wherein the second central focal spot dose rate value d2 is the maximum radiation dose rate value along the second direction in the second cross-section, and the second cross-section is parallel to the first cross-section and is within the radiation beam spot area of the X-ray machine;

[0013] S8. According to the diameter of the radiation output beam spot of the first section, the diameter of the radiation output beam spot of the second section, and the distance between the first section and the second section, obtain the distance between the first section and the radiation focus of the X-ray machine, and calculate the radiation dose rate value at the preset distance.

[0014] Furthermore, a distance between the first cross section and a radiation focus of the X-ray machine is smaller than a distance between the second cross section and a radiation focus of the X-ray machine.

[0015] Furthermore, the diameter of the first radiation output beam spot, the diameter of the second radiation output beam spot, the distance between the first cross section and the radiation focus of the X-ray machine, and the radiation dose rate value at the preset distance satisfy the following relationship:

[0016] X = D1 × Z1 / (D2 - D1);

[0017]

[0018] Among them, X is the distance between the first section and the radiation output focus of the X-ray machine, D1 is the diameter of the first radiation output beam spot, D2 is the diameter of the second radiation output beam spot, Z1 is the distance between the first section and the second section, d0 is the radiation dose rate value at the preset distance, a is the distance from the radiation focus of the X-ray machine to the preset distance, and d1 is the first central focal spot dose rate value of the first section.

[0019] Furthermore, after the step of S8, obtaining the distance between the first section and the radiation focus of the X-ray machine based on the diameter of the radiation output beam spot of the first section, the diameter of the radiation output beam spot of the second section, and the distance between the first section and the second section, the radiation measurement method further includes:

[0020] S9. Determine a radiation output angle β according to the distance between the first cross section and the second cross section, the diameter of the first radiation output beam spot, and the diameter of the second radiation output beam spot.

[0021] Furthermore, the distance between the first cross section and the second cross section, the diameter of the first radiation output beam spot, the diameter of the second radiation output beam spot, and the radiation output angle β satisfy the following relationship:

[0022]

[0023] Furthermore, in the first direction and the second direction, the distance between two adjacent coordinates can be adjusted according to the radiation measurement accuracy requirement.

[0024] Further, S6, according to the plurality of second coordinates and the second peak radiation dose rate value d 2max The step of determining the diameter of the radiation output beam spot of the first cross section specifically comprises:

[0025] S61, with the second peak coordinate as the center, draw an equivalent circle with multiple first differences as the radius, and use the second radiation dose rate value corresponding to the second coordinate as the equivalent radiation dose rate value of the equivalent circle to obtain the radiation distribution of the first cross section, wherein each first difference is the second peak radiation dose rate value d 2max The difference between the second radiation dose rate value and the remaining second radiation dose rate value;

[0026] S61, from the plurality of second coordinates, searching for the radius coordinate of the second radiation dose rate value that satisfies a first preset condition, wherein the first preset condition is that the equivalent radiation dose rate value satisfies the second peak radiation dose rate value d 2max the second coordinate under half of

[0027] S63. Taking the diameter of the equivalent circle of the radius coordinate as the diameter of the first radiation output beam spot.

[0028] The present application also provides a radiation measurement system, which performs any one of the above-mentioned radiation measurement methods. The radiation measurement system includes a radiation detector, a robotic arm, a base, and a measurement and control unit, wherein:

[0029] The robotic arm is used to drive the radiation detector to move so as to detect radiation dose rate values along the first direction and the second direction;

[0030] The radiation detector is used to measure the radiation output dose rate value, and the radiation detector is installed on the robotic arm;

[0031] The measurement and control unit is used to control the movement of the robotic arm and the radiation detector;

[0032] The base is used to carry the radiation detector, the robotic arm and the measurement and control unit.

[0033] Furthermore, the measurement and control unit includes a data processing module, a data acquisition module, and a motion drive module, wherein:

[0034] The motion driving module is used to control the movement of the robotic arm and the radiation detector to a preset position;

[0035] The data acquisition module is used to control the radiation detector to measure a first radiation dose rate value and a second radiation dose rate value;

[0036] The data processing module is used to calculate the radiation dose rate value at a preset distance based on the radiation dose rate value distribution of the first cross-section, the radiation dose rate value distribution of the second cross-section and the distance between the first cross-section and the radiation focus of the X-ray machine.

[0037] The radiation measurement method and radiation measurement system of the embodiment of the present application include setting a first cross section at a first preset position, measuring multiple first radiation dose rates and first coordinates along a first direction in the first cross section, and determining a first peak radiation dose rate value d 1max , measure a plurality of second radiation dose rate values and second coordinates along the second direction, and determine a second peak radiation dose rate value d 2max , according to a plurality of second coordinates and a second peak radiation dose rate value d 2max, determining the diameter of the radiation output beam spot of the first cross-section and the first center focal spot dose rate value d1 of the first cross-section, setting a second cross-section at a second preset position, and repeating the above steps to determine the diameter of the radiation output beam spot of the second cross-section and the second center focal spot dose rate value d2 of the second cross-section, and determining the distance between the first cross-section and the radiation focus of the X-ray machine, thereby calculating the radiation dose rate value at the preset distance. Because no manual intervention or manual distance measurement is required during the measurement step, measurement efficiency and measurement accuracy are improved. Moreover, due to the automated measurement, the risk of operator exposure to radiation caused by manual intervention or manual distance measurement during the radiation measurement process is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A flow chart of a radiation measurement method provided in an embodiment of the present application;

[0039] Figure 2 A flow chart of a radiation measurement method provided in an embodiment of the present application, wherein step S6 is shown;

[0040] Figure 3 A system block diagram of a radiation measurement system provided in an embodiment of the present application;

[0041] Figure 4 A schematic diagram of a radiation measurement process provided in an embodiment of the present application.

[0042] Description of reference numerals:

[0043] 1. X-ray machine; 2. Radiation detector; M, first peak coordinate; N, second peak coordinate; P, first cross section; Q, second cross section; R, equivalent circle; O, coordinate origin. DETAILED DESCRIPTION

[0044] The specific implementation methods of this application are described in detail below with reference to the accompanying drawings.

[0045] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0046] It should be understood that the orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings. These orientation terms are only used to facilitate the description of this application and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting this application.

[0047] In the description of this application, the terms "first / second" are only used to distinguish similar objects and do not represent a specific order for the objects. It can be understood that "first / second" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0048] In the field of X-ray flaw detector verification / calibration, it is necessary to measure the X-ray machine's radiation output, including the radiation angle and the dose rate distribution at specific points along the beam's direction of impact. In the past, verification personnel had to measure the distance between the scanning detector and the X-ray machine on-site, manually move the detector, measure the radiation dose rate at different points, and then calculate the radiation output angle. Using a simple calculation method, they could then determine the radiation dose rate at different locations along the beam's direction of impact. This method was subject to large measurement errors, required significant manual intervention, and was inefficient. Later, some research institutions developed automated X-ray flaw detector verification devices, replacing manual scanning with mechanical scanning. However, manual intervention was still required during the initial scan, such as pre-measurement with a tape measure to determine the exact distance between the scanning device and the X-ray machine. Furthermore, the radiation dose rate distribution along the axis of the X-ray beam's output could not be determined. This resulted in low calibration efficiency and accuracy, high manual intervention, and radiation safety risks.

[0049] In view of this, if Figure 1 and Figure 4 As shown, an embodiment of the present application provides a radiation measurement method, including:

[0050] S1. Setting a first cross section at a first preset position along the radiation output direction of the X-ray machine, wherein the first cross section is perpendicular to the radiation output direction of the X-ray machine and is within the radiation beam spot area of the X-ray machine;

[0051] S2. measuring a plurality of first radiation dose rate values at intervals along a first direction in the first cross section, and recording first coordinates of the plurality of first radiation dose rate values;

[0052] S3. Compare multiple first radiation dose rate values to determine a first peak radiation dose rate value d 1max , and mark the first peak radiation dose rate value d 1max The first peak coordinates of the radiation dose rate are as follows: 1max is the maximum value among the plurality of first radiation dose rate values;

[0053] S4. Taking the first peak coordinate as a starting point, measure a plurality of second radiation dose rate values at intervals along a second direction within the first cross-section, and record second coordinates of the plurality of second radiation dose rate values, wherein the second direction is perpendicular to the first direction, and both the second direction and the first direction are perpendicular to the radiation output direction of the X-ray machine;

[0054] S5. Compare the multiple second radiation dose rate values to determine the second peak radiation dose rate value d 2max , and mark the second peak radiation dose rate value d 2max The second peak coordinates of the second peak radiation dose rate d 2max The first center focal spot dose rate value d1 of the first section is recorded, wherein the second peak radiation dose rate value d 2max is a maximum value among a plurality of second radiation dose rate values;

[0055] S6, according to the plurality of second coordinates and the second peak radiation dose rate value d 2max , determining the diameter of the radiation output beam spot of the first cross section;

[0056] S7, setting a second cross-section at a second preset position along the radiation output direction of the X-ray machine, and repeating S2 to S6 to determine the diameter of the second radiation output beam spot and a second central focal spot dose rate value d2 of the second cross-section, wherein the second central focal spot dose rate value d2 is the maximum radiation dose rate value along the second direction within the second cross-section, the second cross-section is parallel to the first cross-section, and the second cross-section is within the radiation beam spot area of the X-ray machine;

[0057] S8. According to the diameter of the radiation output beam spot of the first section, the diameter of the radiation output beam spot of the second section, and the distance between the first section and the second section, obtain the distance between the first section and the radiation focus of the X-ray machine, and calculate the radiation dose rate value at the preset distance.

[0058] Specifically, a first cross section is set at a first preset position along the radiation output direction of the X-ray machine 1, for example, Figure 4 As shown, for the convenience of recording, the radiation output direction of the X-ray machine is first set as the Z axis direction (reference Figure 4 The first section P is perpendicular to the radiation output direction of the X-ray machine 1 and is within the radiation beam spot area of the X-ray machine 1. It should be understood that since the distribution of the radiation dose rate value of the X-ray machine 1 needs to be calibrated or verified, the first section P for radiation measurement needs to be within the radiation beam spot area of the X-ray machine 1.

[0059] A plurality of first radiation dose rate values are measured at intervals along a first direction in the first section P, and first coordinates of the plurality of first radiation dose rate values are recorded. For example, a scanning measurement device is used to perform linear scanning measurement in an area perpendicular to the Z axis and within the radiation beam spot range, and the scanning direction is defined as the X axis direction (reference Figure 4 ), the initial scanning position is defined as the coordinate origin O, and the first coordinate (x 11 ,0,0),(x 12 ,0,0),…,(x 1n , 0, 0) and the first radiation dose d corresponding to the coordinate point 11 , d 12 ,…,d 1n .

[0060] Compare the multiple first radiation dose rate values to determine the first peak radiation dose rate value d 1max , and mark the first peak radiation dose rate value d 1max The first peak coordinate M, wherein the first peak radiation dose rate value d 1max For example, a statistical or ranking tool is used to compare the multiple first radiation dose rate values, and the first peak radiation dose rate value d is determined from the multiple first radiation dose rate values. 1max , and record the first peak radiation dose rate value d 1max The corresponding first peak coordinate M, the first peak radiation dose rate value d 1max is the maximum value among the multiple first radiation dose rate values, and the first peak coordinate M is also the first coordinate where the radiation dose rate value along the first direction is the largest.

[0061] Taking the first peak coordinate M as the starting point, a plurality of second radiation dose rate values are measured at intervals along the second direction in the first section P, and the second coordinates of the plurality of second radiation dose rate values are recorded, wherein the second direction is perpendicular to the first direction and perpendicular to the radiation output direction of the X-ray machine 1. For example, the first peak radiation dose rate value d is found. 1max The corresponding first coordinate M(x 1max , 0, 0), keep x 1max The coordinates in the Z-axis direction remain unchanged, but the coordinates in the y-axis direction change (refer to Figure 4 ), obtain the second coordinate (x 1max ,y 21 ,0),(x 1max ,y 22 ,0),…,(x 1max ,y 2n , 0) and the second radiation dose rate value d corresponding to the coordinate point 21 , d 22 ,…,d2n .

[0062] Compare the multiple second radiation dose rate values to determine the second peak radiation dose rate value d 2max , and mark the second peak radiation dose rate value d 2max The second peak coordinate N, the second peak radiation dose rate value d 2max The first center focal spot dose rate value d1 of the first section is recorded, wherein the second peak radiation dose rate value d 2max The maximum value among the plurality of second radiation dose rate values is determined by, for example, comparing the plurality of second radiation dose rate values using a statistical or ranking tool, and determining the second peak radiation dose rate value d from the plurality of second radiation dose rate values. 2max , and record the second peak radiation dose rate value d 2max The corresponding second peak coordinate N, the second peak radiation dose rate value d 2max is the maximum value among the multiple second radiation dose rate values, and the second peak coordinate N is the second coordinate where the radiation dose rate value along the second direction is the largest.

[0063] It should be noted that the above-mentioned first direction and second direction are both linear directions and not "ray" types in a narrow sense. For example, when the initial position in the first section P is in the middle, not on one side or one corner, at this time, the radiation dose rate values of multiple points on the straight line should be measured to improve the measurement accuracy and reduce the risk of distortion.

[0064] According to the plurality of second coordinates and the second peak radiation dose rate value d 2max , determine the diameter of the radiation output beam spot of the first cross section, for example, with a second peak radiation dose rate value d 2max As the center, the different second radiation dose rate values are distributed and sorted or modeled, so as to obtain the second radiation dose rate value d according to the plurality of second coordinates and the second peak radiation dose rate value d. 2max , determine the diameter of the radiation output beam spot of the first cross section.

[0065] A second cross section is set at a second preset position along the radiation output direction of the X-ray machine, and the above steps are repeated to determine the diameter of the second radiation output beam spot and the second central focal spot dose rate value d2 of the second cross section, where the second central focal spot dose rate value d2 is the maximum radiation dose rate value along the second direction within the second cross section. The second cross section is parallel to the first cross section and is within the radiation beam spot area of the X-ray machine. The distance between the preset distance and the radiation focal point of the X-ray machine is determined based on the diameter of the first radiation output beam spot, the diameter of the second radiation output beam spot, and the distance between the first cross section and the radiation focal point of the X-ray machine.

[0066] Two sections are set perpendicular to the direction of the radiation beam, and two straight lines are scanned in each section. The coordinates of the focal spot location in each section, the corresponding radiation dose rate value, and the radiation radius of the section are obtained by perpendicular intersection. The position of the radiation focal spot and the radiation position are calculated by the position of the two sections in space, and the distribution of radiation dose rate values at different positions along the direction of the radiation beam are obtained. This method does not require manual intervention to measure any data in advance. The entire measurement process can be fully automatically performed by the radiation measurement system according to the algorithm in the above steps, with high measurement efficiency and accuracy, avoiding the risk of radiation exposure to workers.

[0067] In some embodiments, the distance between the first cross-section P and the radiation focal point of the X-ray machine is less than the distance between the second cross-section Q and the radiation focal point of the X-ray machine. Specifically, to improve measurement efficiency and avoid reciprocating movement of the measuring device or measurement system, the first cross-section P, which is closer to the radiation focal point of the X-ray machine, is measured. After completion, the first and second radiation doses are measured in the second cross-section Q, which is relatively farther away, and the corresponding coordinates are recorded, thereby further improving measurement efficiency.

[0068] In one embodiment, the diameter of the radiation output beam spot of the first cross-section, the diameter of the radiation output beam spot of the second cross-section, the distance between the first cross-section and the radiation focus of the X-ray machine, and the radiation dose rate value at the preset distance satisfy the following relationship:

[0069] X = D1 × Z1 / (D2 - D1) (1);

[0070]

[0071] Where X is the distance between the first section and the radiation output focus of the X-ray machine, D1 is the diameter of the radiation output beam spot of the first section, D2 is the diameter of the radiation output beam spot of the second section, Z1 is the distance between the first section and the second section, d0 is the radiation dose rate value at the preset distance, a is the distance from the radiation focus of the X-ray machine to the preset distance, and d1 is the dose rate value of the first central focal spot of the first section. For example, the radiation beam spot diameter D1 of the first section P is 312mm, the radiation beam spot diameter D2 of the second section Q is 536mm, and the distance Z1 between the first section P and the second section Q is 300mm. The distance X between the first section P and the radiation focus of the X-ray machine is 418mm, and the peak radiation dose rate d of the first section is 418mm. 2max =478mGy / h, i.e., d1 = 478mGy / h. In the radiation output direction, at a distance a from the radiation output focal point A, the radiation dose rate d0 = 478*418*418 / a^2. For example, when a = 200mm, d0 = 2.088Gy / h.

[0072] In one embodiment, after the step of determining the radiation dose rate value at a preset distance based on the diameter of the radiation output beam spot of the first cross-section, the diameter of the radiation output beam spot of the second cross-section, and the distance between the first cross-section and the radiation focus of the X-ray machine in S8, the radiation measurement method further includes:

[0073] S9. Determine the radiation output angle β according to the distance between the first cross section and the second cross section, the diameter of the first radiation output beam spot, and the diameter of the second radiation output beam spot.

[0074] Specifically, since the first coordinate, the second coordinate, the radiation dose rate value of the first section and the radiation dose rate value of the second section are all measured, according to mathematical theory, the radiation output angle β is determined according to the distance between the first section P and the second section Q, the diameter of the radiation output beam spot of the first section, and the diameter of the radiation output beam spot of the second section.

[0075] In one embodiment, the distance between the first cross section and the second cross section, the diameter of the radiation output beam spot of the first cross section, the diameter of the radiation output beam spot of the second cross section, and the radiation output angle β satisfy the following relationship:

[0076]

[0077] For example, the radiation beam spot diameter D2 of the second section Q is 536 mm, the radiation beam spot diameter D1 of the first section P is 312 mm, the distance Z1 between the first section P and the second section Q is 300 mm, and the radiation angle is 40.9°.

[0078] In one embodiment, the spacing between adjacent first and second coordinates is adjusted based on required radiometric measurement accuracy. Specifically, when performing interval measurements along the first and second directions, the measurement "density" directly affects the radiometric measurement accuracy. Therefore, the distance between adjacent first and second coordinates is appropriately defined based on required radiometric measurement accuracy. In particular, when using automated motion measurement, due to its inherent measurement frequency and fixed motion step size, the spacing between adjacent first and second coordinates is uniform. Therefore, the spacing between adjacent first or second coordinates is adjusted based on required radiometric measurement accuracy.

[0079] In one embodiment, if Figure 2 As shown, S6, the step of determining the diameter of the radiation output beam spot of the first cross section according to the multiple second coordinates, specifically includes:

[0080] S61, with the second peak coordinate as the center, draw an equivalent circle with multiple first differences as the radius, and use the second radiation dose rate value corresponding to the second coordinate as the equivalent radiation dose rate value of the equivalent circle to obtain the radiation distribution of the first cross section, wherein each first difference value is the second peak radiation dose rate value d 2max The difference between the second radiation dose rate value and the remaining second radiation dose rate value;

[0081] S62: From the plurality of second coordinates, find the radius coordinate whose second radiation dose rate value satisfies the first preset condition, wherein the first preset condition is that the equivalent radiation dose rate value satisfies the second peak radiation dose rate value d 2max The second coordinate under half of ;

[0082] S63. Taking the diameter of the equivalent circle of the radius coordinate as the diameter of the first radiation output beam spot.

[0083] Specifically, with the second peak coordinate N as the center, an equivalent circle is drawn with multiple first differences as the radius, and the second radiation dose rate value corresponding to the second coordinate is used as the equivalent radiation dose rate value of the equivalent circle to obtain the radiation distribution of the first cross section, wherein each first difference is the second peak radiation dose rate value d 2max For example, find the second peak radiation dose rate value d of the second straight line. 2max The corresponding coordinate point (x 1max ,y 2max , 0), this point (second peak coordinate N) is the center point of the radiation beam spot of the first section P, d 2max That is, the focal spot dose rate value d1 at the center of the first cross section. With this point as the center, multiple first difference values y 2max -y 2max-1 ,y 2max -y 2max-2 ,…,y 2max -y 21 Draw a circle with radius (x 1max ,y 21 ,0),(x 1max ,y 22 ,0),…,(x 1max ,y 2max , 0) coordinate point as the radiation dose rate value corresponding to the equivalent circle, and obtain the radiation output distribution of the first section P.

[0084] From the plurality of second coordinates, find the radius coordinate where the second radiation dose satisfies the first preset condition, where the first preset condition satisfies the second peak radiation dose rate value d 2max The second coordinate under half of the radius coordinate is used as the diameter of the equivalent circle of the radius coordinate as the diameter of the first radiation output beam spot. For example, among all the coordinate points (second coordinates) on the second straight line, find the point (x 1max ,y 1c ,0)、(x 1max ,y 2c , 0) is the second peak radiation dose rate value d 2maxThe diameter of the equivalent circle of the radius coordinate is taken as the diameter of the first radiation output beam spot, and the diameter of the radiation output beam spot D1 = y 2c -y 1c ,

[0085] like Figure 4 As shown, another aspect of the present application further provides a radiation measurement system, which executes the above-mentioned radiation measurement method. The radiation measurement system includes a radiation detector, a robotic arm, a base and a measurement and control unit, wherein the robotic arm is used to drive the radiation detector to move to detect the radiation dose rate value along the first direction and the second direction, the radiation detector is used to measure the radiation output dose rate value, the radiation detector is installed on the robotic arm, the measurement and control unit is used to control the movement of the robotic arm and control the radiation detector, and the base is used to carry the radiation detector, the robotic arm and the measurement and control unit.

[0086] Specifically, before performing radiation measurement, a radiation measurement system is first established. The radiation measurement includes a radiation detector, a robotic arm, a base and a measurement and control unit. The radiation detector is installed at the end of the robotic arm. After assembly, it can move and measure in three-dimensional space. The robotic arm is installed on the base and is used to move to the initial measurement position. The measurement and control unit is used to control the robotic arm to scan and measure in three-dimensional space to obtain the three-dimensional coordinate values of the scanning area and the radiation measurement values (first radiation dose rate value, second radiation dose rate value).

[0087] Since both coordinate values and radiation measurement values are performed automatically, there is no need for human intervention to measure any data in advance. The entire measurement process is automatically implemented by the device's measurement and control unit according to the algorithm, which has high measurement efficiency and accuracy, and avoids the risk of radiation exposure to workers.

[0088] In one embodiment, the measurement and control unit includes a data processing module, a data acquisition module, and a motion drive module, wherein the motion drive module is used to control the movement of the robotic arm and the radiation detector to a preset position, the data acquisition module is used to control the radiation detector to measure a first radiation dose rate value and a second radiation dose rate value, and the data processing module is used to calculate the radiation dose rate value at a preset distance based on the first radiation dose rate value and the second radiation dose rate value.

[0089] Specifically, the motion drive module of the measurement and control unit is used to control the movement of the robotic arm and the radiation detector to a preset position. After the movement is completed, the background program records the coordinate data based on the coordinate value of the initial position. The data acquisition module controls the radiation detector to issue a radiation measurement instruction, thereby measuring the first radiation dose rate value and the second radiation dose rate value. The data processing module calculates the distance between the first section and the radiation focus of the X-ray machine based on the first radiation dose rate value and the second radiation dose rate value, and then calculates the radiation dose rate value at the preset distance.

[0090] In order to better understand the radiation measurement method of the embodiment of the present application, it is described below with reference to specific examples.

[0091] Move the base to the side of the X-ray machine and estimate the approximate coverage area of the X-ray beam. Then start the scanning procedure.

[0092] The coordinate points scanned along the first straight line (along the first direction) of the first section P are (0, 0, 0), (2, 0, 0), (4, 0, 0) ... (800, 0, 0), and the corresponding dose rate values are: 0.31μGy / h, 0.23μGy / h ... 0.42μGy / h. The maximum dose rate value is 98mGy / h, and the coordinate position is (362, 0, 0); the coordinate points scanned along the second straight line (along the second direction) are (362, 2, 0), (362, 4, 0), (362, 6, 0) ... (362, 800, 0), and the maximum dose rate value on the second straight line is 478mGy / h (the second peak radiation dose rate value d 2max ), the coordinate position is (362, 464, 0). The radiation dose rate value change points are (362, 308, 0), (362, 620, 0), that is, the coordinate positions (362, 308, 0), (362, 620, 0) and the second peak radiation dose rate value d in the first section P 2max The difference between the two values is the second peak radiation dose rate value d 2max Half, therefore, the radiation beam spot diameter D1 of the first section P is 312 mm.

[0093] Repeat the above steps and set the distance Z1 between the first section P and the second section Q to 300 mm. The maximum dose rate of the first straight line (along the first direction) in the second section Q is 33 mGy / h, and the coordinate position is (362, 0, 300). The maximum dose rate of the second straight line (along the second direction) is 162 mGy / h, and the coordinate position is (362, 464, 300). The radiation dose rate value change points are (362, 196, 300) and (362, 732, 300), that is, the coordinate positions (362, 196, 300) and (362, 732, 300) are different from the second peak radiation dose rate value d in the second section Q. 2max The difference between the two values is the second peak radiation dose rate value d 2max Half, so the radiation beam spot diameter D2 at the second section Q = 536 mm. Substituting this into the above formula, we obtain a distance of 418 mm from the first section P to the X-ray machine's radiation focus, with a radiation angle of 40.9°. In the radiation output direction, at a distance a from the radiation output focus A, the radiation dose d0 = 478 * 418 * 418 / a^2. For example, when a = 200 mm, d0 = 2.088 Gy / h.

[0094] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present application.

Claims

1. A radiation measurement method, characterized in that: include: S1. Setting a first cross section at a first preset position along the radiation output direction of the X-ray machine, wherein the first cross section is perpendicular to the radiation output direction of the X-ray machine and is within the radiation beam spot area of the X-ray machine; S2. measuring a plurality of first radiation dose rate values at intervals along a first direction in the first cross section, and recording first coordinates of the plurality of first radiation dose rate values; S3. Compare the multiple first radiation dose rate values to determine a first peak radiation dose rate value d 1max , and mark the first peak radiation dose rate value d 1max The first peak coordinate of the radiation dose rate is d 1max is the maximum value among the plurality of first radiation dose rate values; S4. Taking the first peak coordinate as a starting point, measure a plurality of second radiation dose rate values at intervals along a second direction within the first cross-section, and record second coordinates of the plurality of second radiation dose rate values, wherein the second direction is perpendicular to the first direction, and both the second direction and the first direction are perpendicular to the radiation output direction of the X-ray machine; S5. Compare the plurality of second radiation dose rate values to determine a second peak radiation dose rate value d 2max , and mark the second peak radiation dose rate value d 2max The second peak coordinates, the second peak radiation dose rate value d 2max The first center focal dose rate value d1 of the first cross section is recorded, wherein the second peak radiation dose rate value d 2max is the maximum value among a plurality of second radiation dose rate values; S6, according to the plurality of second coordinates and the second peak radiation dose rate value d 2max , determining the diameter of the radiation output beam spot of the first cross section; S7. Set a second cross-section at a second preset position along the radiation output direction of the X-ray machine, and repeat S2 to S6 to determine the diameter of the second radiation output beam spot and a second central focal spot dose rate value d2 of the second cross-section, wherein the second central focal spot dose rate value d2 is the maximum radiation dose rate value along the second direction in the second cross-section, and the second cross-section is parallel to the first cross-section and is within the radiation beam spot area of the X-ray machine; S8. According to the diameter of the radiation output beam spot of the first section, the diameter of the radiation output beam spot of the second section, and the distance between the first section and the second section, obtain the distance between the first section and the radiation focus of the X-ray machine, and calculate the radiation dose rate value at the preset distance.

2. The radiation measurement method according to claim 1, characterized in that: The distance between the first cross section and the radiation focus of the X-ray machine is smaller than the distance between the second cross section and the radiation focus of the X-ray machine.

3. The radiation measurement method according to claim 2, characterized in that: The diameter of the first radiation output beam spot, the diameter of the second radiation output beam spot, the distance between the first cross section and the radiation focus of the X-ray machine, and the radiation dose rate value at the preset distance satisfy the following relationship: X = D1 × Z1 / (D2 - D1); Among them, X is the distance between the first section and the radiation output focus of the X-ray machine, D1 is the diameter of the first radiation output beam spot, D2 is the diameter of the second radiation output beam spot, Z1 is the distance between the first section and the second section, d0 is the radiation dose rate value at the preset distance, a is the distance from the radiation focus of the X-ray machine to the preset distance, and d1 is the first central focal spot dose rate value of the first section.

4. The radiation measurement method according to claim 3, characterized in that: S8. After the step of obtaining the distance between the first section and the radiation focus of the X-ray machine based on the diameter of the radiation output beam spot of the first section, the diameter of the radiation output beam spot of the second section, and the distance between the first section and the second section, the radiation measurement method further includes: S9. Determine a radiation output angle β according to the distance between the first cross section and the second cross section, the diameter of the first radiation output beam spot, and the diameter of the second radiation output beam spot.

5. The radiation measurement method according to claim 4, characterized in that: The distance between the first cross section and the second cross section, the diameter of the first radiation output beam spot, the diameter of the second radiation output beam spot, and the radiation output angle β satisfy the following relationship:

6. The radiation measurement method according to claim 1, characterized in that: In the first direction and the second direction, the distance between two adjacent coordinates can be adjusted according to the radiation measurement accuracy requirement.

7. The radiation measurement method according to claim 1, characterized in that: S6, according to the plurality of second coordinates and the second peak radiation dose rate value d 2max The step of determining the diameter of the radiation output beam spot of the first cross section specifically comprises: S61, with the second peak coordinate as the center, draw an equivalent circle with multiple first differences as the radius, and use the second radiation dose rate value corresponding to the second coordinate as the equivalent radiation dose rate value of the equivalent circle to obtain the radiation distribution of the first cross section, wherein each first difference is the second peak radiation dose rate value d 2max The difference between the second radiation dose rate value and the remaining second radiation dose rate value; S62: Searching for a radius coordinate of the second radiation dose rate value that satisfies a first preset condition from the plurality of second coordinates, wherein the first preset condition is that the equivalent radiation dose rate value satisfies the second peak radiation dose rate value d 2max the second coordinate under half of S63. Taking the diameter of the equivalent circle of the radius coordinate as the diameter of the first radiation output beam spot.

8. A radiation measurement system, wherein the radiation measurement system executes the radiation measurement method according to any one of claims 1 to 7, characterized in that: The radiation measurement system includes a radiation detector, a mechanical arm, a base and a measurement and control unit, wherein: The robotic arm is used to drive the radiation detector to move and detect radiation dose rate values along the first direction and the second direction; The radiation detector is used to measure the radiation output dose rate value, and the radiation detector is installed on the robotic arm; The measurement and control unit is used to control the movement of the robotic arm and the radiation detector; The base is used to carry the radiation detector, the robotic arm and the measurement and control unit.

9. The radiation measurement system according to claim 8, characterized in that The measurement and control unit includes a data processing module, a data acquisition module, and a motion drive module, wherein: The motion driving module is used to control the movement of the robotic arm and the radiation detector to a preset position; The data acquisition module is used to control the radiation detector to measure a first radiation dose rate value and a second radiation dose rate value; The data processing module is used to calculate the radiation dose rate value at a preset distance based on the radiation dose rate value distribution of the first cross-section, the radiation dose rate value distribution of the second cross-section and the distance between the first cross-section and the radiation focus of the X-ray machine.

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