ウクライナ北部におけるセシウム137による内部被ばくと土壌汚染との関連

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 residentsliving 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 exposuredoses 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.長崎大学学位論文 学位記番号:博(医歯薬)甲第830号 学位授与年月日:平成28年3月18日Author: Yuko Kimura, Yuka Okubo, Naomi Hayashida, Jumpei Takahashi, Alexander Gutevich, Sergiy Chorniy, Takashi Kudo, Noboru TakamuraCitation: PLoS ONE, 10(9), e0139007; 2015Nagasaki University (長崎大学)課程博