Radiological and geophysical changes around the Fukushima Daiichi Nuclear Power Plant since the accident to the present time

Abstract

Detailed analysis of accidental released of radioactive material from
Fukushima Daiichi nuclear power plant has shown that long-lived
radionuclides add considerable support for intensity of ion formation.
Based on the results of airborne monitoring by MEXT and DOE (total
surface deposition of Cs134 and Cs137 inside 80 km zone of Fukushima
Daiichi NPP) it has been calculated the spatial distribution of the
intensity of ion formation and atmospheric electric conductivity. The
evidence of plutonium in the Fukushima radioactive trace allows
calculates the concentration of small, intermediate and large ions. The
results show the excess of these parameters by several orders of
magnitude since the accident to the present time. For example the
concentration of small air ion in the area of Chernobyl is
7±2?102 cm-3, the Fukushima Daiichi NPP ones is 1.3?106 cm-3. The
difference in the atmospheric bipolar electric conductivity is about 24
fS/m between the Chernobyl and the Fukushima Daiichi ones. The
evaluation technique was used after Chernobyl disaster allows to make an
analysis of ecological, hygiene requirements and other problems into the
troposphere and on the soil intensity of ion formation in the area of
Fukushima Daiichi nuclear power plant. The standard ion air differ by
four orders of magnitude in the case for Fukushima Daiichi ones.
Comparative study of the radiophysical characteristics of the atmosphere
with the analogous ones in Chernobyl and application of identification
of various types of the air pollution is discussed.