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Impacts of the Fukushima Nuclear Power Plants on Marine Radioactivity
详细信息
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作者:
Ken
Buesseler
;
Michio Aoyama
;
Masao Fukasawa
刊名:Environmental Science & Technology
出版年:2011
出版时间:December 1, 2011
年:2011
卷:45
期:23
页码:9931-9935
全文大小:789K
年卷期:v.45,no.23(December 1, 2011)
ISSN:1520-5851
文摘
The impacts on the ocean of releases of radionuclides from the Fukushima Dai-ichi nuclear power plants remain unclear. However, information has been made public regarding the concentrations of radioactive isotopes of iodine and cesium in ocean water near the discharge point. These data allow us to draw some basic conclusions about the relative levels of radionuclides released which can be compared to prior ocean studies and be used to address dose consequences as discussed by Garnier-Laplace et al. in this journal.
(1) The data show peak ocean discharges in early April, one month after the earthquake and a factor of 1000 decrease in the month following. Interestingly, the concentrations through the end of July remain higher than expected implying continued releases from the reactors or other contaminated sources, such as groundwater or coastal sediments. By July, levels of
137
Cs are still more than 10鈥?00 times higher than levels measured in 2010 in the coastal waters off Japan. Although some radionuclides are significantly elevated, dose calculations suggest minimal impact on marine biota or humans due to direct exposure in surrounding ocean waters, though considerations for biological uptake and consumption of seafood are discussed and further study is warranted.
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