Experimental quantification of radiocesium recycling in a coniferous tree after aerial contamination: Field loss dynamics, translocation and final partitioning

Journal of Environmental Radioactivity
Yves ThiryP Hurtevent

Abstract

After foliar interception of radioactive atmospheric fallout by forest trees, the short-term recycling dynamics of radiocesium from the tree to the soil as well as within the tree is a primary area of uncertainty in the modeling of the overall cycle. The partitioning of radiocesium transfers in a spruce tree exposed to aerial deposits was investigated during one growth season to reveal the dynamics and significance of underlying processes. The rate of radiocesium loss resulting from foliage leaching (wash-off) was shown to have a functional dependence on the frequency of rainy episodes in a first early stage (weathering 60% of initial contamination during 70 days) and on the amount of precipitation in a second stage (weathering 10% of initial deposits during the following 80 days). A classical single exponential decay model with offset and continuous time as predictor lead to a removal half-life t1/2 of intercepted radiocesium of 25 days. During the growth season, the similar pattern of the internal (134)Cs content in new shoots and initially contaminated foliage confirmed that radiocesium was readily absorbed from needle surfaces and efficiently translocated to growing organs. In the crown, a pool of non-leachable (134)Cs (15-...Continue Reading

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Citations

Aug 19, 2016·Journal of Environmental Radioactivity·Toshihiro YoshiharaKo Nakaya
Jan 9, 2020·Scientific Reports·Shoji HashimotoShinta Ohashi
Apr 9, 2020·Environmental Science and Pollution Research International·Dinko BabićGordana Marović
Oct 13, 2020·The Science of the Total Environment·Naohiro ImamuraTakuya Manaka

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