@misc{oai:repo.qst.go.jp:00067284,
 author = {坂内, 忠明 and 村松, 康行 and 坂内 忠明 and 村松 康行},
 month = {Oct},
 note = {Iodine-129 (half life: 16 milion y) is one of the most important long-lived radionuclides for environmental safety assessment related to the nuclear fuel cycle. Therefore, it is necessary to understand the behavior of radioiodine in ecosystem. In this study we have carried out radiotracer experiments using 125I on the volatilization of radioiodine by fungi.
For the experiment we used four basidiomycetes (Lentinula edodes, Pleurotus ostreatus, Hebeloma vinosophyllum and Coprinus phyctidosporus) and one ascomycete (Amphisphaeriaceae). These fungi were cultivated on medium solution containing 125I in vials. The air in vials was introduced to charcoal traps and iodine volatilized by fungi during the cultivation was absorbed by these traps. The radioiodine concentration in the charcoal was measured with a NaI scintillation counter and estimated the volatilization rate, which is defined as "radioiodine concentration in the charcoal" divided by "radioiodine added to the medium solution". 
Among the basidiomycetes used in this study L. edodes showed the highest volatilization rate (total: 3.4%). The volatilization rates observed in P. ostreatus and H. vinosophyllum were very low (total: about 0.3%). Evaporation of iodine by C. phyctidosporus was below the detection limit. A very high volatilization rate of iodine by Amphisphaeriaceae was observed, i.e. 46% of 125I added was evaporated during the cultivation period. 
Amounts of radioiodine fixed in mycelia during the cultivation were examined. In the case of H. vinosophyllum and Amphisphaeriaceae only about 1% of the amount added in medium was retained in mycelia. These values were lower than those of other fungi. The highest value was found in mycelium of P. ostreatus (about 14%). No relationship between volatilization of iodine and the concentration of iodine in mycelium was observed., 第５回ヨウ素利用研究国際シンポジウム},
 title = {菌類によるヨウ素の取り込みと気化},
 year = {2002}
}