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2016 ; 6
(ä): 36947
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Radiocarbon Releases from the 2011 Fukushima Nuclear Accident
#MMPMID27841312
Xu S
; Cook GT
; Cresswell AJ
; Dunbar E
; Freeman SPHT
; Hou X
; Jacobsson P
; Kinch HR
; Naysmith P
; Sanderson DCW
; Tripney BG
Sci Rep
2016[Nov]; 6
(ä): 36947
PMID27841312
show ga
Radiocarbon activities were measured in annual tree rings for the years 2009 to
2015 from Japanese cedar trees (Cryptomeria japonica) collected at six sites
ranging from 2.5-38?km northwest and north of the Fukushima Dai-ichi nuclear
power plant. The (14)C specific activity varied from 280.4?Bq?kg(-1) C in 2010 to
226.0?Bq?kg(-1) C in 2015. The elevated (14)C activities in the 2009 and 2010
rings confirmed (14)C discharges during routine reactor operations, whereas those
activities that were indistinguishable from background in 2012-2015 coincided
with the permanent shutdown of the reactors after the accident in 2011.
High-resolution (14)C analysis of the 2011 ring indicated (14)C releases during
the Fukushima accident. The resulted (14)C activity decreased with increasing
distance from the plant. The maximum (14)C activity released during the period of
the accident was measured 42.4?Bq?kg(-1) C above the natural ambient (14)C
background. Our findings indicate that, unlike other Fukushima-derived
radionuclides, the (14)C released during the accident is indistinguishable from
ambient background beyond the local environment (~30?km from the plant).
Furthermore, the resulting dose to the local population from the excess (14)C
activities is negligible compared to the dose from natural/nuclear weapons
sources.