Effectiveness of decontamination by litter removal in Japanese forest ecosystems affected by the Fukushima nuclear accident.

Activity concentrations of 137 Cs in fresh leaf samples 137 Cs activity concentrations in fresh leaves of broadleaved tree species ranged from 5 to 315 Bq kg −1 dry weight (dw), and generally showed a decreasing trend with time (Fig. 6 ; data for each tree are available in Tables S2 and S3 in Supplementary information).

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