项目名称: 点核积分法中新一代伽马累积因子的建立方法与影响因素研究
项目编号: No.11305146
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 数理科学和化学
项目作者: 赵原
作者单位: 中国辐射防护研究院
项目金额: 30万元
中文摘要: 点核积分方法是伽马射线屏蔽计算的一种重要方法,也可用于场所内剂量分布的模拟计算。但是它不能很好地处理散射问题,需要借助于累积因子进行半经验估计,确定积累因子时引入的误差从本质上限制了该方法的准确度。本项目旨在提高点核积分方法的计算精度和适用性,具体从下面两个方面出发。一,累积因子是点核积分方法的核心,但是国内的数据库还停留在上世纪70年代。本项目将通过蒙特卡罗方法,利用最新的核数据库,研究建立一些常用工程材料的新一代累积因子数据库的方法,并增加可用的辐射量;同时,研究任意"自定义"材料的累积因子自动计算的方法,并开发成相应的蒙卡计算软件,以扩大点核积分方法的应用范围。二,累积因子数据建立在理想假设下,现实中许多因素都会对其造成影响。本项目将针对一些重要的影响因素展开研究,建立它们和理想累积因子的定量关系,以在现实应用中减小点核积分方法的误差。
中文关键词: 伽马射线累积因子;点核积分方法;蒙特卡罗方法;辐射防护;
英文摘要: Point kernel integral method is an important method to calculate the gamma-ray shielding, and can be used to simulate the dose distribution in workplaces. But it cannot deal with the scattering problem well, need the help of semi-empirical estimation on the buildup factors. The error introduced by determining the buildup factors limits the accuracy of the method essentially. This project aims at improving the calculation accuracy of the point kernel method and expanding its applicability, specifically from the following two ways. First, buildup factors are the core of the point kernel method, but the domestic database in China is still stuck in the 1970s. This project will research on the method for establishing a new generation of buildup factors database of some common engineering materials through Monte Carlo method, using the latest nuclear database and adding some available radiation quantities. At the same time, a Monte Carlo simulation program will be developed which could calculate the buildup factors database of "custom" materials automatically, in order to expand the scope of the application of the point kernel method. Second, the buildup factors are calculated on some ideal assumption, in reality many other factors will affect them. This project will address some of the important factors to establish
英文关键词: Gamma ray buildup factors;Point kernel method;Monte Carlo method;Radiation protection;