Evaluation of the Relationship between Current Internal 137Cs Exposure in Residents and Soil Contamination West of Chernobyl in Northern Ukraine.
Evaluation of the Relationship between Current Internal 137Cs Exposure in Residents and Soil Contamination West of Chernobyl in Northern Ukraine.
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DOI：
10.1371/journal.pone.0139007
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Takamura N
中科院分区：
文献类型：
--
作者：
Kimura Y;Okubo Y;Hayashida N;Takahashi J;Gutevich A;Chorniy S;Kudo T;Takamura N
切尔诺贝利核电站事故后，居住在切尔诺贝利周围的居民被发现通过摄入受污染的当地食物而在内部接触到137Cs。为评价~(137)Cs室内暴露现状及其与土壤137Cs污染之间的关系，我们调查了乌克兰日托米尔地区北部10个城市居民的~(137)Cs身体负荷量，并从每个城市的3个家庭农场和野生森林采集了土壤样品，测量了~(137)Cs浓度。参与研究的总人数为36,862人，其中68.9%为女性。2010年后，90%以上的居民年有效剂量低于0.1mSv。秋季~(137)Cs的身体负荷显著高于其他季节(p<；0.001)和生活在污染较重地区的居民(p<；0.001)。我们还发现，估计年暴露剂量超过0.1mSv的每个城市的居民比例与家庭农场土壤样本的137Cs浓度之间存在显著相关性(r=0.828，p=0.003)。总而言之，切尔诺贝利事故发生25年多后，居住在乌克兰北部受污染地区的居民受到的内部照射剂量有限，但仍与137Cs土壤污染有关。此外，当地食物的消费被认为是内部接触的原因。
After the Chernobyl Nuclear Power Plant accident, the residents living around the Chernobyl were revealed to have been internally exposed to 137Cs through the intake of contaminated local foods. To evaluate the current situation of internal 137Cs exposure and the relationship between the 137Cs soil contamination and internal exposure in residents, we investigated the 137Cs body burden in residents who were living in 10 selected cities from the northern part of the Zhitomir region, Ukraine, and collected soil samples from three family farms and wild forests of each city to measured 137Cs concentrations. The total number of study participants was 36,862, of which 68.9% of them were female. After 2010, the annual effective doses were less than 0.1 mSv in over 90% of the residents. The 137Cs body burden was significantly higher in autumn than other seasons (p < 0.001) and in residents living in more contaminated areas (p < 0.001). We also found a significant correlation between the proportion of residents in each city with an estimated annual exposure dose exceeding 0.1 mSv and 137Cs concentration of soil samples from family farms (r = 0.828, p = 0.003). In conclusion, more than 25 years after the Chernobyl accident, the internal exposure doses to residents living in contaminated areas of northern Ukraine is limited but still related to 137Cs soil contamination. Furthermore, the consumption of local foods is considered to be the cause of internal exposure.