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Estimation of immediate fallout after the accident at Fukushima Daiichi Nuclear Power Plant by using HPGe detector
Yasuhiro Unno1, Akira Yunoki, Yasushi Sato
1National Metrology Institute of Japan, Japan; The Graduate University for Advanced Studies (Sokendai), Japan. y.unno@aist.go.jp
Abstract:
After the accident at the Fukushima Daiichi nuclear power plant, we managed to carry out emergency measurements of the radioactive fallout. The included nuclides were identified via gamma-ray spectrometry using an HPGe detector. Quantifications of each radionuclide in the fallout were determined based on the efficiency calibrations and relevant corrections. The collected samples had a variety of shapes, densities, and compositions. EGS5 Monte Carlo code was used for the flexible estimation of these parameters. The measurement results show the temporal changes in the fallout quantity about a month after the accident.
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