Skeppström K, Wåhlin E
Swedish Radiation Safety Authority, 171 16 Stockholm, Sweden.
Swedish Radiation Safety Authority, 171 16 Stockholm, Sweden
Radiat Prot Dosimetry. 2015 Nov;167(1-3):107-10. doi: 10.1093/rpd/ncv212. Epub 2015 Apr 22.
Long-term measurements of thoron progeny concentrations (equilibrium-equivalent thoron concentration) have been carried out in Swedish dwellings with the aim of investigating if thoron and its progeny pose a health risk. Measurements were performed in 93 houses and 25 apartments. In addition to thoron progeny concentration, thoron gas concentration near the wall surface, ambient dose equivalent rate of gamma radiation and radon gas concentration were also measured. The results show that the mean value of thoron progeny was 2.2 Bq m(-3) in houses and 1.6 Bq m(-3) in apartments. Ten per cent of the dwellings (both houses and apartments) had thoron progeny concentrations exceeding 10 Bq m(-3). Thoron progeny concentration is not significantly different in dwellings built of alum shale-based aerated concrete ('blue concrete') than dwellings built of other construction materials. For the dwellings in this study (not representative of the Swedish population), the mean dose estimated due to exposure to thoron was found to be 0.4 mSv y(-1).
为了调查钍射气及其子体是否构成健康风险，在瑞典的住宅中对钍射气子体浓度（平衡当量钍射气浓度）进行了长期测量。测量在93栋房屋和25套公寓中进行。除了钍射气子体浓度外，还测量了靠近墙面的钍射气气体浓度、γ辐射的环境剂量当量率和氡气浓度。结果表明，房屋中钍射气子体的平均值为2.2 Bq m(-3)，公寓中为1.6 Bq m(-3)。10%的住宅（包括房屋和公寓）钍射气子体浓度超过10 Bq m(-3)。与用其他建筑材料建造的住宅相比，用明矾页岩基加气混凝土（“蓝色混凝土”）建造的住宅中钍射气子体浓度没有显著差异。对于本研究中的住宅（不代表瑞典人口），发现因接触钍射气估计的平均剂量为0.4 mSv y(-1)。
