Dataset Information

Temporal variations of ⁹⁰Sr and ¹³⁷Cs in atmospheric depositions after the Fukushima Daiichi Nuclear Power Plant accident with long-term observations.

ABSTRACT: We have measured artificial radionuclides, such as ⁹⁰Sr and ¹³⁷Cs, in atmospheric depositions since 1957 in Japan. We observed the variations in ⁹⁰Sr and ¹³⁷Cs, which were emitted from atmospheric nuclear tests and nuclear power plant accidents, due to their diffusion, deposition, and resuspension. In March 2011, the Fukushima Daiichi Nuclear Power Plant accident occurred in Japan, and significant increases in ⁹⁰Sr and ¹³⁷Cs were detected at our main site in Tsukuba, Ibaraki. Our continual observations revealed that the ¹³⁷Cs monthly deposition rate in 2018 declined to?~?1/8100 of the peak level, but it remained more than?~?400 times higher than that before the accident. Chemical analysis suggested that dust particles were the major carriers of ⁹⁰Sr and ¹³⁷Cs during the resuspension period at our main site. Presently, the effective half-life for ¹³⁷Cs deposition due to radioactive decay and other environmental factors is 4.7 years. The estimation suggests that approximately 42 years from 2011 are required to reduce the atmospheric ¹³⁷Cs deposition to a state similar to that before the accident. The current ⁹⁰Sr deposition, on the other hand, shows the preaccident seasonal variation, and it has returned to the same radioactive level as that before the accident.

SUBMITTER: Kinase T

PROVIDER: S-EPMC7728751 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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Publications

Temporal variations of 90Sr and 137Cs in atmospheric depositions after the Fukushima Daiichi Nuclear Power Plant accident with long-term observations.

Kinase Takeshi T Adachi Kouji K Sekiyama Tsuyoshi Thomas TT Kajino Mizuo M Zaizen Yuji Y Igarashi Yasuhito Y

Scientific reports 20201210 1

We have measured artificial radionuclides, such as 90Sr and 137Cs, in atmospheric depositions since 1957 in Japan. We observed the variations in 90Sr and 137Cs, which were emitted from atmospheric nuclear tests and nuclear power plant accidents, due to their diffusion, deposition, and resuspension. In March 2011, the Fukushima Daiichi Nuclear Power Plant accident occurred in Japan, and significant increases in 90Sr and 137Cs were ...[more]

PMID: 33303800

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Project description:BackgroundTo shed light on the mental health of evacuees after the accident at Fukushima Daiichi Nuclear Power Station (FDNPS), we evaluate the results of the Fukushima Health Management Survey (FHMS) of the residents at Kawauchi village in Fukushima, which is located less than 30 km from the FDNPS.MethodsWe conducted the cross-sectional study within the framework of the FHMS. Exposure values were "anorexia," "subjective feelings about health," "feelings about sleep satisfaction," and "bereavement caused by the disaster," confounding variables were "age" and "sex," and outcome variables were "K6 points." We collected data from the FHMS, and employed the Kessler Psychological Distress Scale (K6) and the posttraumatic stress disorder (PTSD) Checklist Stressor-Specific Version (PCL-S) to carry out the research. A total of 13 or greater was the cut-off for identifying serious mental illness using the K6 scale. The study subjects included residents (n = 542) of over 30 years of age from Kawauchi village, and data were used from the period of January 1, 2012 to October 31, 2012.ResultsA total of 474 residents (87.5%) scored less than 13 points in the K6 and 68 (12.6%) scored 13 points or more. The proportion of elderly residents (over 65 years old) among people with K6 score above the cut-off was higher than that among people with K6 score below the cut-off (44.1 vs 31.0%, p < 0.05). In addition, the proportion of residents with anorexia and mental illness among people with K6 score above the cut-off was higher than among people with K6 score below the cut-off (p < 0.001 and p < 0.05, respectively). The amount of residents who scored 44 points or more in the PCL-S among people with K6 score above the cut-off was also considerably higher than among people with K6 score below the cut-off (79.4 vs 12.9%, p < 0.001). Interestingly, the proportion of residents who scored more than among people with K6 score above the cut-off and the among people with PCL-S score above the cut-off in Kawauchi was higher than in previous studies in other locations.ConclusionsThese results suggest that there are severe mental health problems, such as depression and PTSD, among adults as a consequence of the accident at the FDNPS. Our study showed that residents who lived in the evacuation zone before the disaster are at high risk psychological distress. To facilitate local residents' recovery from Fukushima, there is a need to continue providing them with physical and mental support, as well as communication regarding the health risks of radiation.

Dataset Information

Temporal variations of ⁹⁰Sr and ¹³⁷Cs in atmospheric depositions after the Fukushima Daiichi Nuclear Power Plant accident with long-term observations.

Publications

Temporal variations of <sup>90</sup>Sr and <sup>137</sup>Cs in atmospheric depositions after the Fukushima Daiichi Nuclear Power Plant accident with long-term observations.

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