Marine fish radiation dose estimation method and system based on voxel model

Abstract

The invention relates to a marine fish radiation dose estimation method and system based on a voxel model. The method comprises the following steps: obtaining a fault sequence image of fish; segmenting the fault sequence image according to tissues and organs to obtain segmented images, and endowing the segmented images with different pixel types to obtain segmented images; converting the segmented image into a voxel matrix according to pixel types; establishing a voxel model of the fish according to the voxel matrix; according to the voxel model, obtaining deposition energy of radionuclides on organisms; the radiation dose can be obtained according to the organism deposition. The fish model obtained by the method has high similarity with the actual shape of the fish, the mass of the voxel model is closer to the actual weight of the fish, the tissues and the organs can be distinguished, the tissues and the organs can be identified and segmented by the CT fault sequence image more conveniently, the data is easy to obtain, the applicability is wider, and the radiation dose obtained by calculation is closer to the actual condition.

Description

Technical Field

[0001] The present invention relates to the technical field of radiation impact assessment, and in particular to a method and system for estimating radiation dose of marine fish based on a voxel model. Background Art

[0002] As society attaches more importance to the protection of non-human species, the possible impact of ionizing radiation on non-human species has also attracted increasing attention. The International Atomic Energy Agency (IAEA), the United Nations Commission on the Effects of Radiation (UNSCEAR), and the International Commission on Radiological Protection (ICRP) have all published special publications to discuss and describe this issue. my country's "Radioactive Pollution Prevention and Control Law" promulgated in 2003 and the "Nuclear Safety Law" implemented in 2018 both have requirements for the protection of non-human species.

[0003] The international methods and models for assessing radiation dose and radiation effects of non-human species include: Canada's AECL approach, the UK's R&D128, D-Max, the Netherlands' LAKECOB, the EU's ERICA, the US's RESRAD-BIOTA, France's EDEN2, CATEAUR, etc. Currently, the most widely used are the EU's ERICA program and the US's RESRAD-BIOTA program.

[0004] The EU ERICA program divides organisms into freshwater, marine and terrestrial organisms according to their habitats. Each type is further divided according to the plant family and growth stage, and a total of 40 categories are divided into organisms. Its biological models are all represented by ellipsoids, in which the density, element composition, and nuclides are evenly distributed. The size of the organism can be changed by changing the axis length of the ellipsoid. The US RESRAD-BIOTA program divides organisms into four categories according to their habitats: aquatic animals, coastal animals, terrestrial animals, and terrestrial plants. The biological models are divided into 8 types according to body size, and the body shape of the organism is also represented by an ellipsoid. In addition, the ICRP defined 12 reference organisms in Report No. 108 published in 2008, and the shapes of the organisms are all represented by uniform ellipsoids. Using a uniform ellipsoid to represent a reference organism for dose rate estimation without distinguishing between tissues and organs not only ignores the difference between the ellipsoid and the actual size of the organism, but also fails to consider the density, elemental composition, radionuclide distribution, and the location of the sensitive organ in the body that affect the dose rate, which will lead to uncertainty in the estimated value of the organism dose rate and underestimation of the radiation impact. The above problems need to be solved urgently. Summary of the invention

[0005] The invention discloses a method and system for estimating radiation dose of marine fish based on voxel model, aiming to solve the technical problems existing in the prior art.

[0006] The present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a method for estimating radiation dose of marine fish based on a voxel model, comprising the following steps:

[0008] Obtaining tomographic sequence images of fish;

[0009] Segmenting the tomographic sequence images according to tissues and organs to obtain segmented images, and assigning different pixel types to each of the segmented images to obtain segmented processed images;

[0010] Converting the segmented image into a voxel matrix according to pixel types;

[0011] Establishing a voxel model of the fish according to the voxel matrix;

[0012] Obtaining the deposition energy of the radionuclide on the organism according to the voxel model;

[0013] A radiation dose can be derived from the biorepository.

[0014] In a method for estimating radiation dose of marine fish based on a voxel model of the present invention, the step of converting the segmented processed image into a voxel matrix according to pixel types comprises:

[0015] Read any pixel in the segmented image, define it as a current pixel, obtain the pixel type of the current pixel, and record the number of pixels of the pixel type as 1, where the pixel type at least includes the RGB type of the pixel;

[0016] Reading the pixel type of the pixel adjacent to the current pixel, and determining whether the pixel type is the same as that of the current pixel;

[0017] If they are the same, then the number of pixels corresponding to the pixel type of the current pixel is increased by 1;

[0018] If they are not the same, then the pixel type of the current pixel and the number of pixel types are output as matrix elements, and the adjacent pixel is used as the new current pixel, and the number of pixel types of the current pixel is recorded as 1;

[0019] Each pixel of the segmented image is read in sequence, and the matrix elements are output continuously to obtain the voxel matrix.

[0020] In a method for estimating radiation dose of marine fish based on a voxel model of the present invention, it is characterized by also including obtaining the length and width of the segmented processed image and calculating the number of pixels of the segmented processed image.

[0021] In a method for estimating radiation dose of marine fish based on a voxel model of the present invention, it is characterized in that the step of obtaining a tomographic sequence image of the fish comprises:

[0022] Performing tomographic scanning on the fish in a transverse position by using a computer tomography scanner to obtain the tomographic sequence image;

[0023] The tube voltage of the X-ray tube of the computer tomography scanner was set to 120.0 Kv, and the tube current was set to 210.0 mA.

[0024] In a method for estimating radiation dose of marine fish based on a voxel model of the present invention, it is characterized in that the step of segmenting the tomographic sequence images according to tissues and organs comprises:

[0025] The tomographic sequence images are imported into the PS software, and the tomographic sequence images are segmented according to tissues and organs using the tools provided by the PS software. The tools provided by the PS software at least include a lasso, a polygonal lasso, a magic wand and a paint bucket.

[0026] In a method for estimating radiation dose of marine fish based on a voxel model of the present invention, the step of establishing a voxel model of the fish according to the voxel matrix comprises:

[0027] The voxel matrix is ​​added to the Monte Carlo repetition card, and is combined with the LAT card, the FI LL card, the U card, the grid cell card, the surface card and the data card to compile the Monte Carlo voxel model input file, and the input file is run by the MCNP software to obtain the voxel model of the fish.

[0028] In a method for estimating radiation dose of marine fish based on a voxel model of the present invention, the step of obtaining the deposition energy of radionuclides on organisms according to the voxel model comprises:

[0029] The voxel model of the fish is input into the MCNP software and run to obtain the biological body deposition energy.

[0030] In a method for estimating radiation dose of marine fish based on a voxel model of the present invention, the step of obtaining the radiation dose according to the biological body deposition energy comprises:

[0031] The radiation dose is the internal exposure dosage coefficient, which is calculated according to the following formula:

[0032]

[0033] In the formula, The energy in the source organ or tissue k is E k The radiation corresponds to the internal radiation dose coefficient of the target organ or tissue j, (μGy·h -1) / (Bq·kg -1 );Y k The energy of each decay of the radionuclide is E k The radiation yield; M k is the mass of the source organ or tissue, kg; F k,j (E) is the biomass deposition energy; M j is the mass of the target organ or tissue, kg.

[0034] In a method for estimating radiation dose of marine fish based on a voxel model of the present invention, the step of obtaining the radiation dose according to the biological body deposition energy comprises:

[0035] The radiation dose is the external exposure dosage coefficient, which is calculated according to the following formula:

[0036]

[0037] In the formula, The mass is M k The energy in the external environment medium is E k The radiation corresponds to the external radiation dose coefficient of the target organ or tissue j, (μGy·h -1 ) / (Bq·kg -1 );Y k The energy of each decay of the radionuclide is E k The radiation yield of k,j (E) is the biomass deposition energy; M k is the mass of the external environment medium k, kg; M j is the mass of target organ or tissue j, kg.

[0038] In a second aspect, the present invention also provides a marine fish radiation dose estimation system based on a voxel model, comprising:

[0039] A tomographic sequence image acquisition module, used for acquiring tomographic sequence images of fish;

[0040] A tomographic sequence processing module, used for segmenting the tomographic sequence images according to tissues and organs to obtain segmented images, and assigning different pixel types to each of the segmented images to obtain segmented processed images;

[0041] A voxel matrix acquisition module, used for converting the segmented processed image into a voxel matrix according to pixel types;

[0042] A voxel model building module is used to build a voxel model of the fish according to the voxel matrix;

[0043] A first calculation module is used to obtain the deposition energy of the radionuclide on the organism according to the voxel model;

[0044] The second calculation module is used to obtain the radiation dose according to the biological body deposition energy.

[0045] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0046] The present invention mainly provides a method for estimating radiation dose of marine fish based on voxel model. The method is based on segmenting the tomographic sequence images of fish to obtain segmented images of different tissues and organs, and processing the segmented images to obtain a voxel model of the fish. The obtained fish model has a high similarity with the actual shape of the fish, and the mass of the voxel model is closer to the actual weight of the fish, and tissues and organs can be distinguished. It is more convenient to identify and segment tissues and organs with CT tomographic sequence images, the data is easy to obtain, and the applicability is wider. The radiation dose calculated in this way is closer to the actual situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions explain the present invention and do not constitute improper limitations on the present invention. In the drawings:

[0048] Figure 1 A flow chart of a method for estimating radiation dose of marine fish based on a voxel model of the present invention;

[0049] Figure 2 One of the cross-sectional views of a voxel model diagram established by a method for estimating radiation dose of marine fish based on a voxel model of the present invention;

[0050] Figure 3 A second cross-sectional view of a voxel model diagram established by a method for estimating radiation dose of marine fish based on a voxel model of the present invention;

[0051] Figure 4 A third cross-sectional view of a voxel model diagram established by a method for estimating radiation dose of marine fish based on a voxel model of the present invention;

[0052] Figure 5 This is a comparison chart of estimation results of a method for estimating radiation dose of marine fish based on a voxel model of the present invention. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. In the description of the present invention, it should be noted that the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise.

[0054] Unless expressly indicated to the contrary, the numerical parameters in this specification and the appended claims may be approximate values ​​and can be changed according to the desired properties obtained by the content of the present invention. Specifically, all numbers used in the specification and claims to express the content of the composition, reaction conditions, etc., should be understood to be modified by the term "about" in all cases. In general, the meaning of the expression is to include a change of ±10% in some embodiments, a change of ±5% in some embodiments, a change of ±1% in some embodiments, and a change of ±0.5% in some embodiments by a specific number.

[0055] Furthermore, the word "comprising" does not exclude the presence of materials or steps not listed in the claims. Ordinal numbers such as "first", "second", "third" and Arabic numerals, letters, etc. used in the specification and claims to modify corresponding elements or steps do not themselves mean the order of the manufacturing method. The use of these ordinals is only used to make the steps clearly distinguishable.

[0056] In addition, unless the steps are specifically described or must occur in sequence, the order of the above steps is not limited to the above list, and can be changed or rearranged according to the required design. And the above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

[0057] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] In order to solve the problems existing in the prior art, an embodiment of the present application provides a method for measuring the width of a railway turnout rail flange groove.

[0059] Example 1

[0060] This embodiment provides a method for estimating radiation dose of marine fish based on voxel model. Figure 1 As shown, it includes the following steps:

[0061] Obtaining tomographic sequence images of fish;

[0062] Segmenting the tomographic sequence images according to tissues and organs to obtain segmented images, assigning different pixel types to each segmented image to obtain a segmented processed image; the segmented processed image here is an image in which different pixel types are set on each image in the tomographic sequence images according to different tissues and organs;

[0063] Convert the segmented image into a voxel matrix according to the pixel type;

[0064] Establish a voxel model of fish according to the voxel matrix;

[0065] The deposition energy of radionuclides on organisms is obtained based on the voxel model;

[0066] The radiation dose can be obtained based on the biodeposition.

[0067] The present invention discloses a method for estimating radiation dose of marine fish based on voxel model. The method is based on segmenting the tomographic sequence images of fish to obtain segmented images of different tissues and organs, and processing the segmented images to obtain the voxel model of the fish. The obtained fish model has a high similarity with the actual shape of the fish, and the mass of the voxel model is closer to the actual weight of the fish. The tissues and organs can be distinguished. It is more convenient to identify and segment the tissues and organs with CT tomographic sequence images, the data is easy to obtain, and the applicability is wider. The radiation dose calculated thereby is closer to the actual situation.

[0068] In some preferred embodiments, the step of converting the segmented image into a voxel matrix according to pixel types comprises:

[0069] Read any pixel in the segmented image, define it as the current pixel, obtain the pixel type of the current pixel, and record the number of pixels of the pixel type as 1. The pixel type at least includes the RGB type of the pixel;

[0070] Read the pixel type of the pixel adjacent to the current pixel, and determine whether the pixel type is the same as that of the current pixel;

[0071] If they are the same, then the number of pixels corresponding to the pixel type of the current pixel is increased by 1;

[0072] If they are not the same, then the pixel type and the number of pixel types of the current pixel are output as matrix elements, and the adjacent pixel is used as the new current pixel, and the number of pixel types of the current pixel is recorded as 1;

[0073] Each pixel of the segmented image is read in sequence, and the matrix elements are output continuously (eg, output according to rows of pixels) to obtain a voxel matrix.

[0074] Specifically, this can be achieved through the following procedures:

[0075]

[0076]

[0077] The voxel matrix of each tomographic sequence image is acquired in sequence to obtain the voxel matrix used for establishing the voxel model of the fish.

[0078] In some preferred embodiments, the method further includes obtaining the length and width of the segmented image and calculating the number of pixels of the segmented image.

[0079] In some preferred embodiments, the step of obtaining a tomographic sequence image of a fish comprises:

[0080] The fish is scanned in cross-section by a computer tomography scanner to obtain a tomographic sequence image. Specifically,

[0081] The computer tomography scanner can be a LightSpeed ​​16-row spiral CT manufactured by GE of the United States;

[0082] The tube voltage of the X-ray tube of the computed tomography scanner was set to 120.0 Kv, and the tube current was set to 210.0 mA.

[0083] Preferably, the image scanning interval of the computed tomography scanner is 0.625 mm, the number of image pixels is 512×512, the image size is 18.06 cm×18.06 cm, the resolution is 28.346 pixels / cm, and the voxel size is 0.3527 mm×0.3527 mm×0.625 mm.

[0084] In some preferred embodiments, the step of segmenting the tomographic sequence images according to tissues and organs comprises:

[0085] Import the tomographic sequence images into the PS software, and use the tools provided by the PS software to segment the tomographic sequence images according to tissues and organs. The tools provided by the PS software at least include lasso, polygonal lasso, magic wand and paint bucket.

[0086] In some preferred embodiments, the step of establishing a voxel model of the fish according to the voxel matrix comprises:

[0087] The voxel matrix is ​​added to the Monte Carlo repeat card, and combined with the LAT card, FI LL card, U card, grid cell card, surface card and data card to compile the Monte Carlo voxel model input file. The input file is run by the MCNP software to obtain the voxel model of the fish, such as Figure 2-Figure 4 As shown; the obtained voxel model is a voxel model of the whole fish, and the interior is divided according to tissues and organs; specifically, the repeat card, LAT card, FI LL card, U card, grid element card, surface card and data card can be obtained by referring to the instructions for use of MCNP software.

[0088] In some preferred embodiments, the step of obtaining the deposition energy of radionuclides on a biological body according to the voxel model comprises:

[0089] The voxel model of the fish was input into the MCNP software and the biomass deposition energy was obtained.

[0090] In some preferred embodiments, the step of obtaining a radiation dose based on the biomass deposition energy comprises:

[0091] The organ / tissue with a certain concentration of radionuclides is set as the source organ / tissue, and the organ / tissue that is irradiated is set as the target organ / tissue. The energy in the source organ / tissue k is E k The radiation dose coefficient DC corresponding to the target organ / tissue j can be divided into internal radiation dose coefficient and external radiation dose coefficient;

[0092] The radiation dose is the internal exposure dose factor, calculated according to the following formula:

[0093]

[0094] In the formula, The energy in the source organ or tissue k is E k The radiation corresponds to the internal radiation dose coefficient of the target organ or tissue j, (μGy·h -1 ) / (Bq·kg -1 );Y k The energy of each decay of the radionuclide is E k The radiation yield; M k is the mass of the source organ or tissue, kg; F k,j (E) is the biomass deposition energy; M j is the mass of the target organ or tissue, kg.

[0095] The radiation dose is the external exposure dosage coefficient, which is calculated according to the following formula:

[0096]

[0097] In the formula, The mass is M k The energy in the external environment medium is E k The radiation corresponds to the external radiation dose coefficient of the target organ or tissue j, (μGy·h -1 ) / (Bq·kg -1 );Y k The energy of each decay of the radionuclide is E k The radiation yield; F k,j (E) is the biomass deposition energy; M k is the mass of the external environment medium k, kg; M j is the mass of target organ or tissue j, kg.

[0098] The activity concentration of each part of the organism is weighted according to the mass to obtain the average activity concentration of the organism; the average activity concentration and geometric dimensions of the organism are input into the BiotaDC v.1.5.2 program, and the radiation dose coefficient of the radionuclide to the organism is obtained by running it; the radiation dose result obtained by the estimation method of the present invention is compared with the result obtained by running the BiotaDC v.1.5.2 program to verify the model. The results of the two are equivalent, such as Figure 3 As shown in the figure, as the accuracy of the voxel model is improved, the calculation results are closer to the actual situation, indicating that the calculation results of the BiotaDC v.1.5.2 program are conservative.

[0099] Example 2

[0100] This embodiment provides a marine fish radiation dose estimation system based on a voxel model, which includes:

[0101] A tomographic sequence image acquisition module, used for acquiring tomographic sequence images of fish;

[0102] A tomographic sequence processing module is used to segment the tomographic sequence images according to tissues and organs to obtain segmented images, and to assign different pixel types to each segmented image to obtain a segmented processed image;

[0103] A voxel matrix acquisition module is used to convert the segmentation processed image into a voxel matrix according to the pixel type;

[0104] A voxel model building module builds a voxel model of fish based on the voxel matrix;

[0105] The first calculation module is used to obtain the deposition energy of radionuclides on the organism according to the voxel model;

[0106] The second calculation module is used to obtain the radiation dose according to the biological body deposition energy.

[0107] The present invention discloses a marine fish radiation dose estimation system based on a voxel model. The system segments fish tomographic sequence images to obtain segmented images of different tissues and organs, processes the segmented images to obtain a voxel model of the fish, and the obtained fish model has a high degree of similarity to the actual shape of the fish, and the mass of the voxel model is very close to the actual weight of the fish, and can distinguish tissues and organs. It is more convenient to identify and segment tissues and organs using CT tomographic sequence images, data is easy to obtain, and the applicability is wider. The radiation dose calculated thereby is closer to the actual situation.

[0108] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A method for estimating radiation dose of marine fish based on voxel model, characterized in that: The steps include: Obtaining tomographic sequence images of fish; Segmenting the tomographic sequence images according to tissues and organs to obtain segmented images, and assigning different pixel types to each of the segmented images to obtain segmented processed images; Converting the segmented image into a voxel matrix according to pixel types; Establishing a voxel model of the fish according to the voxel matrix; Obtaining the deposition energy of the radionuclide on the organism according to the voxel model; A radiation dose can be derived from the biorepository.

2. The method for estimating radiation dose of marine fish based on voxel model according to claim 1, characterized in that: The step of converting the segmented processed image into a voxel matrix according to the pixel type comprises: Read any pixel in the segmented image, define it as a current pixel, obtain the pixel type of the current pixel, and record the number of pixels of the pixel type as 1, where the pixel type at least includes the RGB type of the pixel; Reading the pixel type of the pixel adjacent to the current pixel, and determining whether the pixel type is the same as that of the current pixel; If they are the same, then the number of pixels corresponding to the pixel type of the current pixel is increased by 1; If they are not the same, then the pixel type of the current pixel and the number of pixel types are output as matrix elements, and the adjacent pixel is used as the new current pixel, and the number of pixel types of the current pixel is recorded as 1; Each pixel of the segmented image is read in sequence, and the matrix elements are output continuously to obtain the voxel matrix.

3. The method for estimating radiation dose of marine fish based on voxel model according to claim 2, characterized in that: The method also includes obtaining the length and width of the segmented image and calculating the number of pixels of the segmented image.

4. The method for estimating radiation dose of marine fish based on voxel model according to claim 1, characterized in that: The step of obtaining the tomographic sequence image of the fish comprises: Performing tomographic scanning on the fish in a transverse position by using a computer tomography scanner to obtain the tomographic sequence image; The tube voltage of the X-ray tube of the computer tomography scanner was set to 120.0 Kv, and the tube current was set to 210.0 mA.

5. The method for estimating radiation dose of marine fish based on voxel model according to claim 1, characterized in that: The step of segmenting the tomographic sequence images according to tissues and organs comprises: The tomographic sequence images are imported into the PS software, and the tomographic sequence images are segmented according to tissues and organs using the tools provided by the PS software. The tools provided by the PS software at least include a lasso, a polygonal lasso, a magic wand and a paint bucket.

6. The method for estimating radiation dose of marine fish based on voxel model according to claim 1, characterized in that: The step of establishing the voxel model of the fish according to the voxel matrix comprises: The voxel matrix is ​​added to the Monte Carlo repetition card, and is combined with the LAT card, the FILL card, the U card, the grid cell card, the surface card and the data card to compile a Monte Carlo voxel model input file, and the input file is run by the MCNP software to obtain the voxel model of the fish.

7. The method for estimating radiation dose of marine fish based on voxel model according to claim 1, characterized in that: The step of obtaining the deposition energy of radionuclides on the organism according to the voxel model comprises: The voxel model of the fish is input into the MCNP software and run to obtain the biological body deposition energy.

8. The method for estimating radiation dose of marine fish based on voxel model according to claim 1, characterized in that: The step of obtaining the radiation dose according to the biological deposition energy comprises: The radiation dose is the internal exposure dosage coefficient, which is calculated according to the following formula: In the formula, The energy in the source organ or tissue k is E k The radiation corresponds to the internal radiation dose coefficient of the target organ or tissue j, (μGy·h -1 ) / (Bq·kg -1 );Y k The energy of each decay of the radionuclide is E k The radiation yield; M k is the mass of the source organ or tissue, kg; F k,j (E) is the biomass deposition energy; M j is the mass of the target organ or tissue, kg.

9. The method for estimating radiation dose of marine fish based on voxel model according to claim 1, characterized in that: The step of obtaining the radiation dose according to the biological deposition energy comprises: The radiation dose is the external exposure dosage coefficient, which is calculated according to the following formula: In the formula, The mass is M k The energy in the external environment medium is E k The radiation corresponds to the external radiation dose coefficient of the target organ or tissue j, (μGy·h -1 ) / (Bq·kg -1 );Y k The energy of each decay of the radionuclide is E k The radiation yield; F k,j (E) is the biomass deposition energy; M k is the mass of the external environment medium k, kg; M j is the mass of target organ or tissue j, kg.

10. A marine fish radiation dose estimation system based on voxel model, characterized in that: include: A tomographic sequence image acquisition module, used for acquiring tomographic sequence images of fish; A tomographic sequence processing module, used for segmenting the tomographic sequence images according to tissues and organs to obtain segmented images, and assigning different pixel types to each of the segmented images to obtain segmented processed images; A voxel matrix acquisition module, used for converting the segmented processed image into a voxel matrix according to pixel types; A voxel model building module is used to build a voxel model of the fish according to the voxel matrix; A first calculation module is used to obtain the deposition energy of radionuclides on the organism according to the voxel model; The second calculation module is used for obtaining the radiation dose according to the biological deposition energy.

Images