Fig.1-36 Modeling the contributions of radiation originating in different locations in forests to air dose rates
(a) Schematic showing how radioactive cesium (134Cs and 137Cs) exists in different parts of forests (in trees, the litter layer, and soil layers). The gamma rays emitted from 134Cs and 137Cs in the different locations in forests all make separate contributions to the air dose rate. (b) Simulation results showing a breakdown of the contributions to the air dose rate in a mixed forest in Kawauchi, Fukushima Prefecture, for 2011 to 2017. The trend of the total air dose rate is a consequence of the physical decay of 134Cs and 137Cs and the movement of these radioisotopes between different parts of the forest.
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