Comparison of the UNSCEAR isodose maps for annual external exposure in Fukushima with those obtained based on airborne monitoring surveys

In 2016, UNSCEAR published an attachment to its Fukushima 2015 White Paper, entitled ‘Development of
isodose maps representing annual external exposure in Japan as a function of time ’, in which the
committee presented an annual additional 1 mSv effective dose ab extra isodose lines for 1, 3, 5,
10, 30, 50 years after the accident, based on the soil deposition data of radionuclides within 100
km of the Fukushima Dai-ichi Nuclear Power Plant. Meanwhile, the median of the ratio, c , between
the external effective dose rates and the ambient dose equivalent rates 1 m above the ground
obtained by airborne monitoring has been established to be ##IMG##
[http://ej.iop.org/images/0952-4746/38/1/310/jrpaaa57eieqn1.gif] {$c\sim 0.15$} . Here, we compare
the UNSCEAR predictions with estimates based on the airborne monitoring. Although both the methods
and the data used in the two approaches are different, the resultant contours show relatively good
agreement...

Source: Journal of Radiological Protection - February 2, 2018 Category: Physics Authors: Ryugo Hayano and Makoto Miyazaki Source Type: research