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高速実験炉「常陽」による 標的$$alpha$$療法向けAc-225の生成

Production of Ac-225 for targeted alpha therapy utilizing the experimental fast reactor Joyo

前田 茂貴   

Maeda, Shigetaka

$$^{225}$$Acは医薬品向け$$alpha$$放出核種として注目されており、今後需要が増えることが見込まれる。創薬分野の研究開発のみならず経済安全保障の観点でも国産化が急務である。本発表では、国内外の取り組み、原子力機構の取り組み、「常陽」での$$^{226}$$Ra照射法、$$^{229}$$Th照射法を用いた製造の概念検討、製造量評価について報告する。特に最確値評価と不確かさ評価について、「常陽」のこれまでの中性子ドシメトリーを通じて確立したモンテカルロ計算コードMCNPを用いた評価を報告する。

$$^{225}$$Ac is attracting attention as an alpha-emitting medical radioisotope. Since its demand is expected to increase, domestic production of $$^{225}$$Ac is required from the viewpoint of Japan's medical research and economic security. In this presentation, we report on domestic and international efforts, JAEA's efforts, the conceptual study of production using the $$^{226}$$Ra and $$^{229}$$Th irradiation methods at the experimental fast reactor Joyo, and evaluation of production amount. In particular, we report on the most probable value and uncertainty evaluations using the Monte Carlo calculation code MCNP, which was established through the past neutron dosimetry examination in Joyo.

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