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Joint validation of the in-situ uranium age dating method

内在ウラン年代測定法に関する共同検証

大久保 綾子; Mayer, K.*

Okubo, Ayako; Mayer, K.*

European Commission Joint Research Centre (EC-JRC)と原子力機構間の共同研究で、6つの異なるウラン試料を用いて、内在ウラン年代測定法の共同検証を行った。内在ウラン年代測定法による年代測定の結果は、それぞれの試料の既知の製造日と一致した。GUMによる内在ウラン年代測定法の不確実性評価は、$$^{234}$$Th/$$^{230}$$Th測定結果による影響が最も高いことを示した。内在ウラン年代測定法の正確さは、より高精度の$$^{234}$$Th/$$^{230}$$Th測定によって改善することができる。

Under the collaboration between EC-JRC and JAEA, the in-situ age dating method was subject to joint validation, and six different uranium materialswere used for this purpose. The age dating result by in-situ isotope method was consistent with known production dates of the respective samples. The uncertainty evaluation according to GUM for the in-situ isotope method indicates that the measured $$^{234}$$Th/$$^{230}$$Th ratio provides the highest contribution. The accuracy of in-situ isotope method can be improved by higher precision in $$^{234}$$Th/$$^{230}$$Th measurement.

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