Yoshida-Ohuchi Hiroko, Hirasawa Noriyasu, Kobayashi Ikuo, Yoshizawa Takeshi
Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aramaki-Aoba, Aoba-ku, Sendai 980-8578, Japan.
Radiat Prot Dosimetry. 2013;154(3):385-90. doi: 10.1093/rpd/ncs245. Epub 2012 Sep 17.
The personal dose equivalent for 36 Marumori residents living in wooden houses was evaluated using optically stimulated luminescent dosemeters after the Fukushima nuclear accident. The cumulative doses to residents over 200 d from 1 September 2011 ranged from 536 to 1490 µSv. In each resident's house, the indoor and outdoor ambient dose equivalents were measured with an NaI scintillation survey meter. A linear relationship with a slope of 0.5 was found between them; however, the ratio of the indoor to the outdoor ambient dose equivalent varied from 0.36 to 1.0. A better linear relationship was observed between the personal dose equivalent and the indoor ambient dose equivalent compared with that between the personal dose equivalent and the outdoor ambient dose equivalent. These results indicate that the individual exposure dose depends on the indoor ambient dose equivalent rather than the outdoor ambient dose equivalent. These results should be very helpful in obtaining the countermeasures to reduce residents' exposure dose.
福岛核事故后，使用光激发发光剂量计对居住在木屋中的36名丸森居民的个人剂量当量进行了评估。2011年9月1日起200天内居民的累积剂量在536至1490微希沃特之间。在每位居民家中，使用碘化钠闪烁辐射测量仪测量室内和室外环境剂量当量。发现二者之间存在斜率为0.5的线性关系；然而，室内与室外环境剂量当量之比在0.36至1.0之间变化。与个人剂量当量和室外环境剂量当量之间的关系相比，个人剂量当量与室内环境剂量当量之间观察到更好的线性关系。这些结果表明，个体暴露剂量取决于室内环境剂量当量而非室外环境剂量当量。这些结果对于获取减少居民暴露剂量的对策应非常有帮助。
