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Concentrations of 137Cs, 134Cs and potassium were surveyed in 32 mushrooms and 24 substrates (upon which the mushrooms grow) obtained from fields in Japan. Radiocesium concentrations (137Cs+134Cs) in mushrooms and substrates in the forests of Mt. Fuji varied widely from 17 to 1083Bq/kg in fresh mushroom samples, and in dry substrate samples they were in the range of 66 to 531Bq/kg, whereas levels of potassium remained essentially constant. 134Cs released from the Chernobyl reactor was determined in some mushrooms and some substrates from the sub-alpine forest of Mt. Fuji. Mushroom-to-substrate concentration ratios of 137Cs were much higher than tree leavesor mosses-to-substrates concentration ratios near the study locations, and were larger by 100-to 1000-fold than the reported transfer factors of 137Cs from soils to leaf vegetables, root crops or potatoes. Significant correlations between ignition loss of substrates and concentration of 137Cs in mushrooms, and between pH value in substrates and concentration of 137Cs in mushrooms or mushroom-to-soil concentration ratio of 137Cs were found, suggesting possible 137Cs uptake mechanisms. The effective dose equivalent

Concentration of Radiocesium in Mushrooms and Substrates in the Sub-Alpine Forest of Mt. Fuji Japan