2016 Volume 5 Issue 2 Pages 33-38
Air kerma rates by environmental γ-ray at two years after the Fukushima Nuclear Power Station accident were investigated around public facilities in Fukushima City, Koriyama City, Nihonmatsu City and Motomiya City in the Naka-dori area of Fukushima Prefecture. A CsI scintillation survey meter, which is very versatile, was used for measurement. This survey meter was calibrated by means of simultaneous measurement with an NaI(Tl) scintillation spectrometer. The minimum values of air kerma rates at each measurement site were higher than the background levels, and the medians were 0.23-0.35 μGy/h. Using these values and assuming a one year stay at the site, the annual effective dose was evaluated to be 1.5-2.3 mSv. The maximum value was 0.57-1.03 μGy/h, and the annual effective dose by environmentalγ-ray was estimated to be 3.7-6.7 mSv without considering the attenuation of the radioactivity.
