Concentrations of ^<137>Cs and ^<40>K in Mushrooms Consumed in Japan and Radiation Dose as a Result of Their Dietary Intake

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Mushrooms are known to accumulate radiocesium. To estimate the intake of radiocesium through the eating of mushrooms, about 30 samples belonging to 4 commonly consumed species (Lentinula edodes, Hyp-sizigus marmoreus, Grifola frondosa, and Tricholoma matsutake), were analyzed for ^<137>Cs and 40K. The concentration ranges were 0.060-29 Bq kg^<-1> (wet wt) for ^<137>Cs and 38-300 Bq kg^<-1> (wet wt) for ^<40>K. The geometric mean concentration for ^<137>Cs was 0.56 Bq kg^<-1> (wet wt), and the mean concentration for ^<40>K was 92 Bq kg^<-1> (wet wt). The ^<137>Cs concentrations in L. edodes cultivated in mushroom beds (sawdust-rice bran media) were lower than those cultivated on bed logs (natural wood with bark). The annual intake of ^<137>Cs per person through mushrooms was calculated, by using the current analytical results and food consumption data in Japan, to be 3.1 Bq for ^<137>Cs, which is about 28% of the total dietary intake of this nuclide. The effective dose equivalent of ^<137>Cs through mushrooms was estimated to be 4.0×10^<-8> Sv, which is about the half the value obtained in our previous study. The decrease of the ^<137>Cs intake through mushrooms is probably related to changes in cultivation methods in recent years, from the use of bed logs to mushroom beds.
日本放射線影響学会の論文
2004-06-15