摘要
研究了平行测量氡、气土 暴露量和加吸收体甄别掉氡的直接测量气土 暴露量的两种方法 ,并建立了简易刻度系统。平行测量氡、气土 暴露量时 ,两个相同剂量计的过滤窗分别装上不同滤材 ,使两个剂量计的扩散速率常数λd 存在一定的差异 ,而导致它们测量氡、气土 时具有不同的响应。该方法测量氡、气土 暴露量的探测下限分别为 0 74kBq·m- 3·h和 1 2 5kBq·m- 3·h。加吸收体甄别掉氡测气土 的方法是在CR 39SSNTD上加盖 4 5μm铝膜和 10 μmPE塑料膜甄别掉氡及其子体产生的α粒子 ,直接测量气土 的衰变子体2 12 Po(ThC′)产生的部分α粒子。该方法测量气土 暴露量的探测下限为2 2 1kBq·m-
Both radon and thoron exposure monitoring method at the same time, and thoron exposure only monitoring method with absorber discriminating radon are developed. A simple calibration system is developed too. When radon and thoron exposure are measured simultaneously, two same dosimeters with different filter materials have the different diffusion rate constants λ d, and are of different response factors for radon and thoron. The lower limits of detection are 0.74 and 1.25 kBq·m -3 ·h for radon and thoron exposure measurement, respectively. When both a piece of 45 μm thick aluminium film and 10 μm thick PE preservation film are placed on CR-39 SSNTD, all α particles emitting from radon and its daughters are absorbed, only a part of α particles emitting from 212 Po(ThC′) can be recorded by CR-39 SSNTD. The lower limit of detection for thoron exposure measurement is 22.1 kBq·m -3 ·h._
出处
《原子能科学技术》
EI
CAS
CSCD
2001年第4期325-330,共6页
Atomic Energy Science and Technology
