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2016 ; 6
(ä): 26412
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Indoor radiocaesium contamination in residential houses within evacuation areas
after the Fukushima nuclear accident
#MMPMID27212076
Yoshida-Ohuchi H
; Kanagami T
; Satoh Y
; Hosoda M
; Naitoh Y
; Kameyama M
Sci Rep
2016[May]; 6
(ä): 26412
PMID27212076
show ga
Indoor contaminants were investigated from July 2013 to January 2015 within
ninety-five residential houses in five evacuation zones, Iitate village, Odaka
district, and the towns of Futaba, Okuma, and Tomioka. A dry smear test was
applied to the surface of materials and structures in rooms and in the roof-space
of houses. We found that (134)Cs and (137)Cs were the dominant radionuclides in
indoor surface contamination, and there was a distance dependence from the
Fukushima Daiichi nuclear power plant (FDNPP). For surface contamination in
Iitate village (29-49?km from the FDNPP), 24.8% of samples exceeded the detection
limit, which is quite a low value, while in Okuma (<3.0?km from the FDNPP), 99.7%
of samples exceeded the detection limit and surface contamination levels exceeded
20?Bq/cm(2) (the value was corrected to March 2011). In residential houses in
Okuma, Futaba, and Tomioka, closer to the FDNPP than those in Odaka district and
Iitate village, surface contamination was inversely proportional to the square of
the distance between a house and the FDNPP. In the houses closest to the FDNPP,
the contribution of surface contamination to the ambient dose equivalent rate was
evaluated to be approximately 0.3??Sv/h.