Point kernel integration method and Monte Carlo method coupling-based radiation shielding calculation method

Abstract

The invention relates to the technical field of nuclear radiation protection, and provides a point kernel integration method and Monte Carlo method coupling-based radiation shielding calculation method. The method comprises the steps of establishing a geometric part of a point kernel integration sub-model; establishing a source item part of the point kernel integration sub-model, and performing discrete processing on a body source or a surface source; solving attenuation of the source item in the point kernel integration sub-model; solving a wide beam accumulation factor; solving a point kernel integration equation to obtain the dosage rate or the flux density of a shielding region; according to variable parameters provided by a user, performing iterative calculation; comparing all geometric information obtained by calculation with the dosage rate / the flux result to obtain an optimal model meeting the demand; according to the optimal model, building a Monte Carlo sub-model; solving theMonte Carlo sub-model by using a Monte Carlo calculation program; and comparing calculation results of the Monte Carlo sub-model and the point kernel integration sub-model. According to the calculation method, the calculation correctness can be assessed during the iterative calculation, so that the calculation precision is improved and relatively high calculation efficiency can be achieved.

Description

technical field [0001] The invention relates to the technical field of nuclear radiation protection, in particular to a radiation shielding calculation method coupled with a point kernel integral method and a Monte Carlo method. Background technique [0002] Radiation shielding calculation is to carry out particle transport simulation on nuclear-related devices through radiation shielding calculation programs, so as to obtain the energy spectrum and flux density of neutrons and gamma rays in the shielded area of ​​nuclear-related devices, and evaluate the impact on personnel and equipment in the shielded area. radiation dose to ensure its radiation safety. [0003] Radiation shielding calculation procedures are generally divided into point kernel integral method, deterministic method and Monte Carlo method. [0004] The point kernel integral method is a Green's function integral method, which calculates the penetration behavior of neutrons and γ-rays in the geometric space,...

AI Technical Summary

Problems solved by technology

The advantage of the Monte Carlo method is that the calculation results are accurate, and it supports accurate modeling of complex materials and complex geometries. At present, there are a large number of auxiliary modeling tools that can realize the three-dimensional visual modeling of the Monte Carlo calculation model. The simulation process of random sampling It is more in line with the characteristics of the actual particle transport process, and is currently the best radiation safety calculation method confirmed by the International Atomic Energy Commission; the disadvantage of this method is that the simulation speed is slow, and it takes a lot of time to achieve the calculation results with small statistical errors, and iterative design low design efficiency

[0007] The traditional radiation shielding calculation method is usually a single method, while the radiation shielding design is an iterative process in most cases, which leads to certain limitations of each method

The point kernel integration method relies on design experience, and the correctness of the calculation results cannot be verified; the calculation results of the Monte Carlo method are accurate, but the iterative calculation process consumes a lot of computer time, and the design efficiency is low

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