Highly Sensitive Measurements of 222Rn Diffusion and Emanation
Highly Sensitive Measurements of 222Rn Diffusion and Emanation
复制标题
222Rn 扩散和发射的高灵敏度测量
DOI：
--
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
G. Zuzel
中科院分区：
文献类型：
--
作者：
G. Zuzel
本文提出了一种高灵敏度的测定222Rn从固体中释放和通过不同膜扩散的技术。222Rn及其子体在绝对灵敏度为∼30μBq的特殊比例计数器中通过阿尔法衰变进行测量。可以在∼10−13 cm~2/S的水平上测量氡的扩散。检查了几个样品，例如不锈钢、聚四氟乙烯、各种垫片(发射和扩散测量)和储罐。结合对薄尼龙箔(用于Borexino实验)的222Rn扩散和发射的测量，可以在∼10−12 g/g 238U当量的水平上测定感兴趣的材料中的226 Ra。
Highly sensitive techniques for determination of the 222Rn emanation from solids and diffusion through different membranes are presented. 222Rn and its daughters are measured via the alpha decays in special proportional counters at the absolute sensitivity of ∼30 μBq. Radon diffusion can be measured at the level of ∼10−13 cm2/s. Several samples were examined, e.g. stainless steel, teflon, various gaskets (emanation and diffusion measurements) and tanks. A combination of measurements of the 222Rn diffusion and emanation of thin nylon foils (used in the Borexino experiment) allowed the determination of 226Ra in the materials of interest at the level of ∼10−12 g/g 238U‐equivalent.