Radiocarbon and radiocesium in litter fall at Kawamata, to 45 km NW from the Fukushima Dai-ichi nuclear power plant (Japan)
Résumé
Radiocarbon and radiocesium were measured on litter fractions (LF) collected on November 19th, 2011 at 40km NW of the FDNPP. The Cs-137 concentration is much higher in the lower fraction LFb at 226,650 +/- 170Bqkg(-1) than in the upper fraction LFa at 7290 +/- 40Bqkg(-1). From leaf-air C-14 comparison, no excess C-14 due to the FDNPP accident is detected in LFa deposited in 2010-2011. A significant C-14 difference of 1.4% exists between pine needles and deciduous leaves in LFb, which may be due either to post-depositional processes or to a turnover time of 0.5-1year of stored carbon for deciduous leaves growth.
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