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Lessons from the Fukushima and Chernobyl accidents concerning the 137Cs contamination of orchard fresh fruits

Published online by Cambridge University Press:  07 May 2014

Ph. Renaud  and
M.-A. Gonze

Abstract

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The observations made in Japan in 2011 after the Fukushima-Daiichi accident and those made in France, Italy, Greece and Austria in 1986 after the Chernobyl fallout, show that the development stage of orchard trees at the time of atmospheric deposition is a major factor determining the level of caesium contamination in fruits at harvest. Both data sets are shown to be consistent and enable one to estimate, for mobile elements in plants such as caesium, an aggregated transfer factor (expressed in Bq.kg-1 of fresh fruit per Bq.m-2 deposited on the ground surface) whose value strongly depends on the time elapsed between fallout and harvest. The Fukushima data set also enables one to estimate effective half-lives (expressed in days), which are helpful for predicting the decrease in fruit contamination with time. We found an average value of 200 days for the one-year period after radioactive fallout, which is quite consistent with values estimated from post-Chernobyl surveys.

Keywords

Fukushima-Daiichi NPP accidentChernobylfruit contaminationcaesium dynamicstransfer parameters
Type
Research Article
Information
Radioprotection , Volume 49 , Issue 3 , July 2014 , pp. 169 - 175
Copyright
© EDP Sciences, 2014

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