2008 Volume 57 Issue 12 Pages 753-757
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.