Kudo H, Tokonami S, Omori Y, Ishikawa T, Iwaoka K, Sahoo S K, Akata N, Hosoda M, Wanabongse P, Pornnumpa C, Sun Q, Li X, Akiba S
Graduate School of Health Sciences, Hirosaki University, Hirosaki, Japan.
Institute of Radiation Emergency Medicine Hirosaki University, Hirosaki, Japan
Radiat Prot Dosimetry. 2015 Nov;167(1-3):155-9. doi: 10.1093/rpd/ncv235. Epub 2015 May 1.
The present study focuses on internal exposure caused by the inhalation of radon and thoron progenies because the internal exposures have not yet been clarified. For their dose assessment, radon, thoron and thoron progeny concentrations were measured by passive monitors over a long period (for 6 months). Consequently, radon, thoron and equilibrium equivalent thoron concentrations were given as 124 ± 78, 1247 ± 1189 and 7.8 ± 9.1 Bq m(-3), respectively. Annual effective doses are estimated to be 3.1 ± 2.0 mSv for radon and 2.2 ± 2.5 mSv for thoron. Total dose are estimated to be 5.3 ± 3.5 mSv a(-1). The present study has revealed that the radon dose was comparable with the thoron dose, and the total dose was ∼2 times higher than the worldwide average.
由于内照射情况尚未明确，本研究聚焦于吸入氡及其子体所导致的内照射。为进行剂量评估，通过被动式监测仪长期（6个月）测量了氡、钍射气及其子体的浓度。结果显示，氡、钍射气和平衡当量钍射气的浓度分别为124±78、1247±1189和7.8±9.1 Bq m(-3)。氡的年有效剂量估计为3.1±2.0 mSv，钍射气的年有效剂量估计为2.2±2.5 mSv。总剂量估计为5.3±3.5 mSv a(-1)。本研究表明，氡剂量与钍射气剂量相当，且总剂量约为全球平均水平的2倍。
