Characteristic of thoron (220Rn) in environment
Characteristic of thoron (220Rn) in environment
复制标题
DOI：
10.1016/j.apradiso.2016.11.014
复制
发表时间：
2017-02-01
影响因子：
1.6
通讯作者：
Tokonami, Shinji
中科院分区：
文献类型：
--
作者：
Hosoda, Masahiro;Kudo, Hiromi;Tokonami, Shinji
本文描述了 Rn-220（以下简称钍气）子代测量对于剂量估计的重要性。尽管钍气活度浓度的空间分布很大程度上取决于距作为室内钍气源的墙壁表面的距离，但作为钍气子体之一的Pb-212活度浓度预计会观察到均匀分布。此外，通过最近在几个国家的测量获得的钍气的平均平衡因子在 0.008 到 0.07 之间变化。因此，用钍气的平衡因子和活度浓度代替钍气子体活度浓度来评估支气管剂量可能存在较大的不确定性。因此，应在每个测量点研究钍气子体测量，以估计钍气的剂量。
This paper describes importance of Rn-220 (hereafter thoron) progeny measurement for the dose estimation. Although the spatial distribution of thoron activity concentration strongly depends on the distance from wall surface as an indoor thoron source), a homogeneous distribution was expected to be observed for Pb-212 activity concentration which was one of thoron progeny. Furthermore, the mean equilibrium factor for thoron obtained by the recent measurements in several cotintries widely ranged from 0.008 to 0.07. Therefore the bronchial dose evaluated using the equilibrium factor and activity concentration of thoron instead of thoron progeny activity concentration may have a large uncertainty. Thus, the thoron progeny measurement should be investigated at each measurement point for the dose estimation for thoron.