Radiocaesium activity concentrations in parmelioid lichens within a 60 km radius of the Fukushima Dai-ichi Nuclear Power Plant

Dohi, Terumi ; Omura, Yoshihito*; Kashiwadani, Hiroyuki*; Fujiwara, Kenso ; Sakamoto, Yoshiaki ; Iijima, Kazuki

Radiocaesium activity concentrations ( $^{134}$ Cs, $^{137}$ Cs) were measured in parmelioid lichens collected within the Fukushima Prefecture approximately 2 y after the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident. A total of 44 samples consisting of nine species were collected at 16 points within a 60 km radius of the FDNPP. The activity concentration of $^{134}$ Cs ranged from 4.6 to 1000 kBq kg $^{-1}$ and for $^{137}$ Cs ranged from 7.6 to 1740 kBq kg $^{-1}$ . A significant positive correlation was found between the $^{137}$ Cs activity concentration in lichens and the $^{137}$ Cs deposition density on soil, based on the calculated Spearman's rank correlation coefficients as = 0.90 ( 0.01). The two dominant species, Flavoparmelia caperata and Parmotrema clavuliferum, showed strong positive correlations, for which the r values were calculated as 0.92 ( 0.01) and 0.90 ( 0.01) respectively. Therefore, they are suggested as biomonitoring species for levels of radiocaesium fallout within the Fukushima Prefecture.

Language	:	English
Journal	:	Journal of Environmental Radioactivity
Volume	:	146
Number	:
Pages	:	p.125 - 133
Publication Year/Month	:	2015/08
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Paper URL	:	https://doi.org/10.1016/j.jenvrad.2015.04.013
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Keywords	:	Caesium 134; Caesium 137; fallout; foliose lichens; biomonitor; bioindicator; Fukushima Daiichi Nuclear Power Station Accident; 福島第一原子力発電所事故
Research Facility	:
Press Release	:
Article of JAEA R&D Review	:	Application of Lichens for the Record of Fukushima Fallout; A Potential Indicator for the Estimation of Initial Fallout Amount[/]
Cooperating Institute	:	国立科学博物館

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Registration No. : AA20140290
JAEA Abstracts No. : 43000916
Paper Submission No. : 16023

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