Hosoda Masahiro, Kudo Hiromi, Iwaoka Kazuki, Yamada Ryohei, Suzuki Takahito, Tamakuma Yuki, Tokonami Shinji
Hirosaki University Graduate School of Health Science, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan.
Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan.
Appl Radiat Isot. 2017 Feb;120:7-10. doi: 10.1016/j.apradiso.2016.11.014. Epub 2016 Nov 22.
This paper describes importance of Rn (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 activity concentration which was one of thoron progeny. Furthermore, the mean equilibrium factor for thoron obtained by the recent measurements in several countries 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.
本文描述了钍射气（以下简称钍射气）子体测量对于剂量估算的重要性。尽管钍射气活度浓度的空间分布强烈依赖于作为室内钍射气源的与墙面的距离，但作为钍射气子体之一的铅活度浓度预计会呈现均匀分布。此外，最近在几个国家进行的测量所得到的钍射气平均平衡因子广泛分布于0.008至0.07之间。因此，使用钍射气的平衡因子和活度浓度而非钍射气子体活度浓度来评估支气管剂量可能存在很大的不确定性。因此，为了进行钍射气的剂量估算，应在每个测量点对钍射气子体进行测量。
