著者

北脇 裕士 堀川 洋一 小豆川 勝見 野川 憲夫

出版者

宝石学会(日本)

雑誌

宝石学会誌 (ISSN:03855090)

巻号頁・発行日

vol.31, no.1, pp.17-19, 2014

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Two slightly orangy pink morganites with residual radioactivity were studied. The dose rate of the samples, measured by a scintillation survey meter, ranged from 0.15 to 0.35 μSv/h. Although this radioactivity was likely not hazardous, it was above the recommended exposure limit set forth in 1990 by the International Commission on Radiological Protection. To identify the radionuclides, gamma rays from the samples were measured using a Ge(Li) semiconductor detector. The activation products ^<134>Cs, ^<54>Mn, and ^<65>Zn were detected, proving that the samples had been artificially irradiated with neutrons.