^(220)Rn子体暴露的剂量转换系数研究  

The Dose Conversion Factors for Thoron Decay Products Exposure

作　　者：王锋[1] 张磊[1,2] 郭秋菊[2] 王善强[1] 艾宪芸[1] 马新华[1] 史志兰[1] 

机构地区：[1]防化研究院二所,北京102205 [2]北京大学物理学院技术物理系,北京100086

出　　处：《辐射防护》2013年第1期54-58,共5页Radiation Protection

摘　　要：环境中220Rn子体暴露的剂量评价是近些年天然辐射防护研究领域热议的问题之一,其中一个焦点问题就是室内环境220Rn子体暴露的剂量转换系数的变化。回顾了近年来国内外该问题相关的研究结果,自行计算了室内环境下220Rn子体暴露的剂量转换系数,特别考虑结合态粒径分布及未结合态份额对室内环境220Rn子体暴露的剂量转换系数的影响。研究表明,220Rn子体暴露的剂量转换系数随着结合态220Rn子体粒径分布的增加而先降低后增加,随着220Rn子体未结合态份额的增大而线性增大。典型室内环境下220Rn子体暴露的有效剂量转换系数为95.95 nSv.(Bq.h.m-3)-1,其变化范围为90.61～101.28 nSv.(Bq.h.m-3)-1。The dose evaluation of ^220Rn exposure in environment is one of the hottest discussed issues in the field of radiation protection. One focused point of this issue is the change of the dose conversion factor of ^220Rn progeny exposure. This paper reviews the recent domestic and foreign research results related to this problem and calculates the dose conversion factor of ^220Rn progeny, especially taking into count of the affect of the size distribution of attached ^220Rn progeny and the unattached fraction. The results show that the dose conversion factor changes with the size distribution of attached ^220Rn progeny, as it grows, first grows down then grows up. The dose conversion factor increases linearly with the unattached fraction. In typical indoor environment, the effective dose conversion factor of ^220Rn progeny exposure would be 95.95nSv·（Bq·h·m^-3）^-1, with a varing range of 90.61～101.28nSv·Bq·h·m^-3）^-1.

关 键 词：220Rn子体 剂量转换系数 未结合态份额 粒径分布 

分 类 号：X837[环境科学与工程—环境工程]