Decadal trends in ¹³⁷Cs concentrations in the bark and wood of trees contaminated by the Fukushima nuclear accident.

The 137 Cs concentration in the outer bark showed a decreasing trend (0.2–0.5-fold decrease, biological half-life of 3.2–4.9 years) in all analyzed plots except the site-2 cedar plot (Fig. 2 ).

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The 137 Cs concentration in the whole wood showed an increasing trend in six plots.

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