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At-211 is artificially produced for medical purposes. To prevent severe loss of shortlived At-211, a rapid method analyzing both the radioactivity and all chemical forms was required for related fundamental researches. We propose a new method by means of an α-scintillation-camera system comprising of thin-layer chromatography and a high-sensitive CCD camera. The performance of the system was experimentally verified: low-radioactivity At-211 of 56 - 672 Bq was measured in a short-time of 1000 sec and all chemical forms of At-211 were evaluated. The results reveal that the method enables us to analyze two features of At-211 with significantly short-time.

学位の種別: 課程博士, 審査委員会委員 : （主査）東京大学教授 石田 貴文, （副査）東京大学准教授 中山 一大, 東京大学教授 河村 正二, 東京大学教授 太田 博樹, 東京大学准教授 大橋 順