Other
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...9925049m&link_type=abstract
Memoirs of the Tohoku Institute of Technology. Series 1: Science and Engineering, p. 1
Other
Gamma Rays, Cesium 137, Fungi, Gamma Ray Absorptiometry, Radioactivity, Ring Structures, Water, Contamination, Annual Variations, Potassium 40
Scientific paper
Weak gamma rays from Cs-137 in shelf fungi have been measured. Shelf fungi possess annual-ring structures and this made it possible to obtain an annual variation of the radioactive intensity by measuring gamma rays from each annual ring of the sample. Gamma rays from Cs-137 were especially strong in the newest parts of the samples, i.e. the parts of shelf fungi grown in the year 1992 when the samples were gathered. This shows that the part of the most rapid growing largely collects Cs-137. The intensities of K-40 were also measured, but were found to be markedly weak. This is the most distinctive feature as compared with other fungi. The annual variation of intensities as was found for Cs-137 was not clearly observed in the case of K-40. Shelf fungi have been customarily used as a medicine usually by drinking a decoction. The intensity of gamma rays from Cs-137 was measured for the filtered liquid obtained by decocting shelf fungi in boiled water. Certain amount of Cs-137 contaminations was found to be present in the liquid.
Abe Toshimi
Miura Kohji
Suehiro Teruo
Takagi Kazuo
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