期刊论文

Extrapolation Chamber Entrance Window Correction Factor on ~(90)Sr β Ray Radiation Field

Zhou, Q.

中文

原子能科学技术

1000-6931

2019

53

5

920-925

10.7538/yzk.2018.youxian.0465

本校为第一且通讯机构

为实现外推电离室对β辐射吸收剂量的准确测量,对影响外推电离室入射窗修正因子k_(wi)的主要量进行了研究.实验测量了外推电离室不同极间距和不同源-探距(源到外推电离室入射窗表面的距离)下的k_(wi).研究结果表明,在源-探距不变的条件下,k_(wi)随电离室极间距的增大而减小;在电离室极间距为3 mm的条件下,k_(wi)随源-探距的增大而减小.利用蒙特卡罗模拟计算出不带展平过滤器、源-探距为30 cm、电离室极间距为3 mm时,k_(wi)为1.084 5,与实验测量结果比较,其相对偏差为0.11%.因此,在给出k_(wi)的同时,应提供相应的源-探距和电离室极间距.

In order to achieve accurate measurement of the absorbed dose of beta radiation, the main influence factors of the extrapolation chamber entrance window correction factor kwi were studied. kwi at different cavity lengths and different source-detection distances was measured by experiments. The results show that the correction factor kwi with the same source-detection distance decreases with the increase of the cavity length. And kwi decreases with the increase of the source-detection distance when the cavity length is 3 mm. The calculated kwi w...