Impact on Absorbed Dose Rate in Air in the Izu Islands From Long Half-Life Radionuclides Released by the Fukushima Daiichi Nuclear Power Plant Accident

Changes in environmental radiation levels in Katsushika Ward, Tokyo after the Fukushima Daiichi Nuclear Power Plant accident

“…The correlation between count rates inside and outside the car measured at 13 locations is shown in Table 1 and the SFs and their standard uncertainties [24,25] ranged from 1.270 to 1.565 and from 0.017 to 0.032, respectively. The coefficient of determination (R 2 ) from measurement correlations ranged from 0.988 to 0.996.…”

“…Additionally, the relative standard uncertainties of one-time measurement (30 s) (i.e., car-borne survey technique) were calculated to be 2.0%. The combined relative standard uncertainties of the car-borne survey [24,25] have been calculated and reported as 7.2-7.9%. However, the real combined relative standard uncertainty would be estimated as more than 7.2-7.9% when compared to measured dose rates before and after the accident because a part of the survey route was changed after the accident.…”