TAILIEUCHUNG - Nuclear Power Operation Safety and Environment Part 12

Tham khảo tài liệu 'nuclear power operation safety and environment part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Long-Term Effects of Exposure to Low-Levels of Radioactivity a Retrospective Study of 239Pu and 90Sr from Nuclear Bomb Tests on the Swiss Population 319 because these databases contain autopsy tissues from both the general public and workers of the nuclear industry. Similar values to Switzerland were determined in Germany Bunzl and Kracke 1983 and in the UK Popplewell et al. 1985 for the years around 1980. Higher values were obtained at the Semipalatinsk test site STS during the 2000 s indicating an effect of the test site fallout in the plutonium body burden of the population Yamamoto et al. 2006 . Using ICP-MS Yamamoto et al. 2008 found a significantly lower 240Pu 239Pu isotopic ratio of in autopsy tissues bone of individuals from the STS confirming the influence of the STS fallout on plutonium incorporation. There were too few bone ash samples in our study to separate individuals from different regions especially the ones potentially affected by the Swiss NPPs. Accordingly our data represent a pool of bone samples from all over Switzerland. Nevertheless the 240Pu 239Pu isotopic ratio of indicates beyond any reasonable doubts that the plutonium inhaled by the Swiss population comes from the fallout of the NBTs of the sixties. 7. Retention half-times in the skeleton of 90Sr and plutonium The retention half-time in the skeleton of bone-seeking radionuclides such as 90Sr and plutonium is a key parameter used for their dosimetry in humans. Currently only a partial answer is given to the question of how long plutonium will stay in the body. Values found in the literature are situated between 15 to 100 years with a proposed value by ICRP 56 or Kathren 1995 of 50 y. Our long-term study of 90Sr and plutonium in the vertebrae allowed us to determine with a high statistical significance the retention half-time of both radionuclides in cancellous bones. It is of 40 15 y 95 confidence for plutonium and for 90Sr Figure 9 . Meanwhile the retention time of .

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