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Atmospheric activity concentration of Sr and Cs after the Fukushima Daiichi Nuclear Accident.

08:00 EDT 6th August 2018 | BioPortfolio

Summary of "Atmospheric activity concentration of Sr and Cs after the Fukushima Daiichi Nuclear Accident."

On 11 March 2011, the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident occurred and a large amount of radionuclides were discharged into the atmosphere. We have operated continuous aerosol samplings at four locations in Japan from the accident until the end of 2011. The activities of Sr and Cs in the aerosol samples were measured using low background liquid scintillation counters and high-purity germanium detectors, respectively. The atmospheric 90Sr and 137Cs concentrations decreased exponentially during 2011. The time variation of the Sr/Cs ratio was obtained, and we found that the ratio rose from 1.2 × 10 in March to 1.3 × 10 in August of 2011. One reason for the increase in the Sr/Cs ratio could be the change in the primary emission source of activity at the FDNPP, which occurred near June of 2011.

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Name: Environmental science & technology
ISSN: 1520-5851
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