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Making use of the predictions of "alpha-systematics" on the extent of alpha-branching of the isotope AcK and of the properties of the resultant At²¹⁹ daughter, the branching was looked for and found in the francium fraction isolated from a 20-mC source of Ac²²⁷. The observed branching rate is ca 4×{}10^-5, and the At²¹⁹ daughter decays predominately by the emission of 6.27-Mev alpha-particles with a half-life of 0.9 minute to the new isotope Bi²¹⁵, which in turn emits β^- particles with a half-life of 8 minutes. At²¹⁹ also decays by β^- emission to An²¹⁹ about once in 30 disintegrations. It is pointed out that this is the first reported instance of a chemical identification of an isotope of element 85 from a natural source, although other shorter-lived astatine isotopes are known to exist.
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Hyde et al. (1953) studied this question.
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