Concentrations of
134Cs,
137Cs and
40K in mushrooms cultivated in Saitama prefecture and those substrates were measured by gamma-ray spectrometry. In all mushrooms and substrates,
134Cs was not detected. Concentrations of
137Cs in mushrooms were in the range of 0.012-2.1Bq/kg·fresh, and those in substrates were in the range of 0.080-1.8Bq/kg·dry. Concentrations of
137Cs in mushrooms varied widely with mushroom species, and the average concentration of
137Cs in Lentinus edodes (Shiitake) was over 30 times higher than that in Pleurotus ostreatus (Hiratake). Mushroom-to-substrate concentration ratios of
137Cs (fresh/dry) were 0.11-0.53. They were higher than the reported transfer factors for common agricultural plants.
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