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Vol.62 (2016) >

Please use this identifier to cite or link to this item: http://ir.fmu.ac.jp/dspace/handle/123456789/515

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Title: Radiation survey on Fukushima Medical University premises about four years after the Fukushima nuclear disaster
Authors: Omori, Yasutaka
Wakamatsu, Hiroaki
Sorimachi, Atsuyuki
Ishikawa, Tetsuo
Affiliation: 放射線物理化学講座
Source title: Fukushima Journal of Medical Science
Volume: 62
Issue: 1
Start page: 1
End page: 17
Issue Date: 2016
Abstract: This study was conducted on the Fukushima Medical University (FMU) premises (in Fukushima City, Fukushima Prefecture) about four years after the Fukushima Daiichi Nuclear Power Plant accident. Its objectives were (1) to create a map of the ambient gamma dose rate (air-kerma rate) distribution, (2) to evaluate the air-kerma rate originating from natural radionuclides, and (3) to investigate the effects of snow cover on changes in the air-kerma rate. This man-borne survey revealed that the air-kerma rate varies widely, ranging from 0.038 μGy h-1 to 0.520 μGy h-1, and is higher on grass than on the other investigated surface types, such as soil, asphalt, and bricks. In this area, the mean air-kerma rate from natural radiation was evaluated to be 0.03 ± 0.01 μGy h-1, which is close to 0.04 μGy h-1, which was measured in central Fukushima City by a local authority.Furthermore, snowfall was found to reduce the air-kerma rate by 5%-30%. This reduction was attributed to attenuation of the primary radiation while passing through the snow cover, and the measured contribution of scattered radiation to the air-kerma rate reduction was small. The reduction rate was found to depend on the initial snow depth but to maintain a similar value for a couple of days, after the snow had partially melted and its depth had decreased. Finally, analysis of the daily dose due to external exposure received on the FMU premises revealed that no further health effects due to chronic radiation exposure at this site are to be expected.
Publisher: The Fukushima Society of Medical Science
Publisher (Alternative foam): 福島医学会
language: eng
URI: http://ir.fmu.ac.jp/dspace/handle/123456789/515
Full text URL: http://ir.fmu.ac.jp/dspace/bitstream/123456789/515/1/FksmJMedSci_62_p1.pdf
ISSN: 0016-2590
DOI: 10.5387/fms.2015-16
PubMed ID: 26911302
Related Page: http://doi.org/10.5387/fms.2015-16
Rights: © 2016 The Fukushima Society of Medical Science
Appears in Collections:Vol.62 (2016)

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FksmJMedSci_62_p1.pdf3.61 MBAdobe PDFDownload

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