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Nuclear and radiochemical study of production and utilization of radioactive astatine isotopes in the Li + $$^{nat}$$Pb reaction

Li+$$^{nat}$$Pb反応での放射性アスタチン同位体の製造と利用についての核・放射化学的研究

西中 一朗; 横山 明彦*; 鷲山 幸信*; 天野 良平*; 前田 英太*; 山田 記大*; 牧井 宏之; 渡邉 茂樹; 石岡 典子; 橋本 和幸

Nishinaka, Ichiro; Yokoyama, Akihiko*; Washiyama, Koshin*; Amano, Ryohei*; Maeda, Eita*; Yamada, Norihiro*; Makii, Hiroyuki; Watanabe, Shigeki; Ishioka, Noriko; Hashimoto, Kazuyuki

An $$alpha$$ radioactive nuclide $$^{211}$$At with a half-life of 7.2 h is a prospective candidate for utilization in targeted alpha radiotherapy. In a general way, $$^{211}$$At is produced through the $$^{209}$$Bi($$alpha$$,2n)$$^{211}$$At reaction. However, the nuclear reactions using lithium ion beams provide the possible production routes of $$^{211}$$At. Therefore, we have measured excitation functions of At isotopes in the reaction of 29-57 MeV $$^7$$Li + $$^{nat}$$Pb at the tandem accelerator of JAEA-Tokai. The cross sections of radioactive products were determined by $$alpha$$- and $$gamma$$-ray spectrometry. The experimental excitation functions of astatine isotopes have been compared with a statistical calculation to study the reaction mechanism. Besides, a chemical separation of carrier-free radioactive astatine isotopes from an irradiated target has been studied with a dry-chemistry method. Details will be shown in the presentation.

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