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光ルミネッセンス測定装置への密封$$beta$$線源の導入と放射線管理; 日本原子力研究開発機構土岐地球年代学研究所での例

The Installation and the radiation protection of the optically stimulated luminescence reader with sealed beta source in the Toki Research Institute of Isotope Geology and Geochronology, Japan Atomic Energy Agency

徳安 佳代子; 古田 定昭*; 國分 陽子; 梅田 浩司

Tokuyasu, Kayoko; Furuta, Sadaaki*; Kokubu, Yoko; Umeda, Koji

地質試料の年代測定を行うため、日本原子力研究開発機構土岐地球年代学研究所に光ルミネッセンス測定装置(Riso TL/OSL DA-20)が導入された。本装置では、試料に人工放射線を繰返し照射して試料に蓄積された線量を求めるため、密封線源を装置へ据付ける必要がある。しかし、本装置の放射線管理に関する情報はほとんどない。そこで本稿では、線源を受入れるまでの流れを紹介するとともに、線源の据付や使用における放射線管理について報告する。

An optically stimulated luminescence reader (Riso TL/OSL DA-20) was installed in Toki Research Institute of Isotope Geology and Geochronology (Toki-shi, Gifu Prefecture), Japan Atomic Energy Agency (JAEA) for dating the geological sample. An accumulated dose of the sample is obtained using the reader. Sealed beta source of strontium-90 is required to be mounted on the reader because repeated artificial irradiation is necessary for the accumulated dose estimation. However, there are not many introduction examples for the reader domestically, and the information as to radiation control of the reader is limited. We therefore report here the process of source loading on the reader and radiation control associated with the use of the source.

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