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Environmental Radiation Monitoring and External Dose Estimation in Aomori Prefecture after the Fukushima Daiichi Nuclear Power Plant Accident

“…The indoor and outdoor occupancy factors were decided as 0.92 and 0.08, respectively, according to the above data. The values evaluated in this study were similar to the values reported by IYOGI et al, 17) and were used for the external dose estimation.…”

“…IYOGI et al 17) did not nd a seasonal variation for the effective dose. Thus, annual effective doses to the residents were considered without seasonal variation in the present study.…”

“…17) The DCF value of 0.748 ± 0.007 Sv Gy -1 was obtained experimentally for natural gamma-rays in various environments by MORIUCHI et al. 45) It should be noted that this DCF value was obtained as the conversion factor from absorbed dose rate in air to effective dose equivalent.…”

“…49) Furthermore, data for the working population above 15 years of age in Aomori Prefecture were also summarized by MIC. 50) These values are listed together with the values reported by IYOGI et al 17) in Ta le 2. The indoor and outdoor occupancy factors were decided as 0.92 and 0.08, respectively, according to the above data.…”

“…In the nationwide survey by NIRS, measurements of ambient dose rate were carried out at only 23 points in Aomori Prefecture 14) and these were not enough to draw a detailed dose rate distribution map of the prefecture. IYOGI et al 17) measured absorbed dose rate in air at 109 points in residential areas of Aomori Prefecture using radio-photoluminescence glass dosimeters (RPLGDs), and they provided the rst reported dose rate distribution map of the prefecture. Their survey included suf cient data to estimate the external dose for residents.…”