An Adaptive Radiation Dose Calculation Simulation Method for Irregular Shaped Radiation Sources

A radiation dose and simulation method technology, applied in the direction of design optimization/simulation, special data processing application, etc., can solve the problem of not dealing with irregular shape geometry adaptive radiation dose calculation simulation method, inflexible dose assessment, increased calculation time, etc.

Active Publication Date: 2021-09-10
HARBIN ENG UNIV
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Problems solved by technology

However, at present, researchers usually use the method of uniformly and discretely generating point nuclei for radioactive sources to calculate the dose. When a higher point nucleus density is used, the number of point nuclei increases sharply, which can ensure the calculation accuracy, but the calculation time increases sharply; When the point kernel density is high, it is difficult to ensure the calculation accuracy, so the dose assessment in dynamic environments such as cutting operations is inflexible and inefficient, and there is no adaptive radiation dose calculation simulation method for dealing with irregular geometry and radioactive sources

Method used

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  • An Adaptive Radiation Dose Calculation Simulation Method for Irregular Shaped Radiation Sources
  • An Adaptive Radiation Dose Calculation Simulation Method for Irregular Shaped Radiation Sources
  • An Adaptive Radiation Dose Calculation Simulation Method for Irregular Shaped Radiation Sources

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Effect test

Embodiment 1

[0053] (1) Establish and export the 3D geometric model of the object in the 3D modeling software as the initial input;

[0054] (2) Read the 3D model file of the object to obtain the mesh model of the object;

[0055] (3) Spatial division;

[0056] (4) Using a cuboid to approximate the object model;

[0057] (5) The cuboid on the surface of the object overlaps with the object to generate an adaptive point kernel;

[0058] (6) The cuboid segmentation inside the object generates an adaptive point kernel;

[0059] (7) Calculate the gamma radiation dose by using the point kernel method.

[0060] Spatial subdivision includes:

[0061] 1) Select the axis-aligned cuboid geometric space larger than the object as the initial segmentation body, set the threshold of space division, and divide the geometric space by binary tree. The initial division space is used as the root of the tree, and the plane perpendicular to the longest axis and located in the center of the longest axis is ...

Embodiment 2

[0086] 1. Establish the 3D geometric model of the object in the 3D modeling software and export it as the initial input;

[0087] 2. Read the 3D model file of the object and obtain the mesh model of the object;

[0088] 3. Input parameters such as space subdivision threshold, boundary volume sampling density, internal volume segmentation threshold, radioactive source material, activity, energy spectrum, and detection point position, and the algorithm automatically generates an adaptive point nucleus distribution for dose calculation. The process is as follows :

[0089](1) Space subdivision: through space subdivision, a group of axis-aligned cuboids are used to approximate the outline of the object, and at the same time, the collision detection technology in virtual reality is used to judge whether the cuboid collides with the object. If there is a collision, it means that the cuboid needs to be further subdivided. If there is no collision, the cuboid is inside or outside the...

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Abstract

The invention discloses an adaptive radiation dose calculation and simulation method for an irregular-shaped radiation source, which belongs to the field of nuclear facility decommissioning simulation. The invention includes establishing a three-dimensional geometric model of an object in three-dimensional modeling software and exporting it as an initial input; reading the three-dimensional model file of the object to obtain a grid model of the object; space division; using a cuboid to approximate the object model; An adaptive point kernel is generated from the overlapping part with the object; an adaptive point kernel is generated from the cuboid segmentation inside the object; the point kernel method is used to calculate the gamma radiation dose. The invention adopts the self-adaptive point kernel technology to improve the calculation efficiency, and can adjust the distribution density of the point kernel according to the position of the detection point to meet the requirements of radiation dose calculation time and accuracy, and can process any shape geometry, so that the modeling of the dose evaluation can be achieved. , The calculation process is more flexible and efficient.

Description

technical field [0001] The invention belongs to the field of nuclear facility decommissioning simulation, and in particular relates to an adaptive radiation dose calculation simulation method for irregularly shaped radioactive sources. Background technique [0002] The decommissioning and dismantling of nuclear facilities has the characteristics of long cycle, high radiation and high risk. During the operation of nuclear facilities, the construction environment is highly radioactive due to neutron activation or radionuclide contamination of the equipment itself, which seriously threatens the safety of operators. The nuclear radiation hazards in the decommissioning process of nuclear facilities mainly come from gamma radiation. In order to ensure the radiation safety of personnel during the decommissioning process of nuclear facilities and reduce the radiation hazards caused by the decommissioning construction process to construction personnel, the public and the environment,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 刘永阔晁楠杨欢夏虹彭敏俊
Owner HARBIN ENG UNIV
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