Method for calculating and simulating radiation dosages of radioactive source cutting operations

A radiation dose and simulation method technology, applied in design optimization/simulation, calculation, image data processing, etc., can solve the problems of inefficiency, radiation dose calculation simulation method without shape, and limited cutting simulation range, etc., to achieve calculation The effect of process flexibility

Active Publication Date: 2018-08-31
HARBIN ENG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, researchers usually establish cutting models manually in advance or use basic geometry to approximate the decommissioning scene. This method can only deal with simple geometric scenes, and cannot model radioactive sources under complex cutting operations with high precision, and the cutting simulation range is limited. Limited to the pre-established cutting model library, it makes the dose assessment in the cutting operation environment inflexible and inefficient, and there is no radiation dose calculation simulation method for performing complex cutting operations on radioactive sources with arbitrary shapes

Method used

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  • Method for calculating and simulating radiation dosages of radioactive source cutting operations
  • Method for calculating and simulating radiation dosages of radioactive source cutting operations
  • Method for calculating and simulating radiation dosages of radioactive source cutting operations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Establish and export the 3D geometric model of the object in the 3D modeling software as the initial input;

[0055] (2) Read the 3D model file of the object to obtain the mesh model of the object;

[0056] (3) Approximate cutting surface;

[0057] (4) triangular mesh segmentation on the surface of the object;

[0058] (5) Profile generation;

[0059] (6) Sampling to generate point cores;

[0060] (7) Calculate the gamma radiation dose by using the point kernel method.

[0061] Approximate cutting surfaces include:

[0062] 1) First find the enclosing rectangle containing the cutting trajectory, set the discrete step length of the rectangle, and discretize the enclosing rectangle into a grid;

[0063] 2) Calculate the intersection of the cutting trajectory line and the grid line. Adjacent intersection points form a line segment. With each line segment as a side, a series of rectangular surfaces are constructed according to the cutting depth direction. All recta...

Embodiment 2

[0094] 1. Establish the 3D geometric model of the object in the 3D modeling software and export it as the initial input;

[0095] 2. Read the 3D model file of the object and obtain the mesh model of the object;

[0096] 3. Input the discrete step length of the cutting trajectory, sampling density, radioactive source material, activity, energy spectrum, and detection point position, use the mouse and keyboard to construct the cutting trajectory, the algorithm automatically generates the geometric model of the cutting product, and generates a point nucleus through sampling, and proceeds Dose calculation, the process is as follows:

[0097] (1) Cutting surface approximation: first find the enclosing rectangle containing the cutting trajectory and discretize it into a grid, calculate the intersection point of the cutting trajectory line and the grid line, the adjacent intersection points form a line segment and use the line segment as the side, and construct a series of cutting de...

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Abstract

The invention discloses a method for calculating and simulating radiation dosages of radioactive source cutting operations, and belongs to the field of nuclear facility retirement simulation. The method comprises the following steps of: establishing a three-dimensional geometric model of an object in three-dimensional modeling software, and exporting the three-dimensional model as an initial input; reading a three-dimensional model file of the object to obtain a grid model of the object; approximating a cutting surface; partitioning triangular grids on the surface of the object; generating a section; carrying out sampling to generate point cores; and carrying out gamma radiation dosage calculation by adoption of a point core method. According to the method, automatic modeling of geometriesand radiation sources with arbitrary shapes under complicated cutting operations is realized by means of a virtual reality technology, and dosage estimation is carried out by utilizing a grid model of cut products and a manner of carrying out sampling to generate point cores, so that a virtual reality model is combined with dosage calculation and then the calculation process is more flexible andefficient.

Description

technical field [0001] The invention belongs to the field of nuclear facility decommissioning simulation, and in particular relates to a radiation dose calculation and simulation method for radioactive source cutting operation. Background technique [0002] The decommissioning of nuclear facilities is the last important link in the life cycle management of nuclear facilities. 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, ALARA (as lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06T17/20
CPCG06T17/20G06F30/23
Inventor 刘永阔晁楠杨欢夏虹彭敏俊
Owner HARBIN ENG UNIV
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