Studies on the level of radionuclides and trace elements in Japanese third molar. I. On 90Sr between 1900-1970(as of May, 1989).:I On 90Sr between 1900-1970 (as of May, 1989)

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1) Strontium-90 level was determined in May 1989 in 40 sample groups of Japanese teeth, for a total of 1022 third molars, obtained from donors born in 1900-1970. 2) The teeth from donors born in 1925-1931, and which were extracted in the donors' twenties did not contain detectable strontium-90. 3) Strontium-90 level of the teeth from donors born in and after 1942 suddenly increased, and reached peak value of 62.8 to 72.8mBq/g Ca in 1953. It abruptly decreased after 1954 and reached approximately 20mBq/g Ca by 1970. 4) In the teeth obtained from donors born in 1900-1924, and which were extracted at the age of 30 to 69, a small amount of strontium-90 was detected.
有限責任中間法人日本口腔衛生学会の論文