Department of Radiation Biology, Tohoku University School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575, Japan.
Department of Chemistry, Tohoku University Graduate School of Science, 6-3 Aramaki Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan.
Int J Environ Res Public Health. 2021 Feb 11;18(4):1772. doi: 10.3390/ijerph18041772.
We investigated the internal contamination by radioactive cesium associated with the FDNPP accident, in the testes or uterus and ovaries of free-roaming cats (), which were protected by volunteers in the Namie Town, Fukushima. A total of 253 samples (145 testes and 108 uterus and ovaries) obtained from adult cats and 15 fetuses from 3 pregnant female cats were measured. Free-roaming cats in Namie Town had a higher level of radioactive contamination in comparison to the control group in Tokyo, as the Cs + Cs activity concentration ranged from not detectable to 37,882 Bq kg in adult cats. Furthermore, the radioactivity in the fetuses was almost comparable to those in their mother's uterus and ovaries. The radioactivity was also different between several cats protected in the same location, and there was no significant correlation with ambient dose-rates and activity concentrations in soil. Moreover, radioactive cesium levels in cats decreased with each year. Therefore, it is likely that decontamination work in Namie Town and its surroundings could affect radioactive cesium accumulation, and thus possibly reduce the internal radiation exposure of wildlife living in contaminated areas. It is hence necessary to continue radioactivity monitoring efforts for the residents living in Namie Town.
我们调查了福岛第一核电站事故相关放射性铯在自由放养猫（）睾丸或子宫和卵巢中的内污染情况，这些猫由浪江町的志愿者保护。共测量了 253 个成年猫的样本（145 个睾丸和 108 个子宫和卵巢）和 3 只怀孕母猫的 15 个胎儿。与东京的对照组相比，浪江町的自由放养猫受到的放射性污染水平更高，因为成年猫的 Cs + Cs 活度浓度范围从不可检测到 37882 Bq kg。此外，胎儿中的放射性几乎与母亲的子宫和卵巢中的放射性相当。在同一地点受到保护的几只猫之间的放射性也存在差异，与环境剂量率和土壤中活度浓度没有显著相关性。此外，猫体内的放射性铯水平逐年下降。因此，浪江町及其周边地区的去污工作可能会影响放射性铯的积累，从而可能降低生活在污染地区的野生动物的内照射风险。因此，有必要继续对居住在浪江町的居民进行放射性监测。
