The β-rays emitted by the isotopes Ga⁷⁰, As⁷⁶, Br⁸⁰, Br⁸², Rb⁸⁶, Rh¹⁰⁴, Ag¹⁰⁸, In¹¹⁶, Sb¹²², Sb¹²⁴, I¹²⁸, Re¹⁸⁶, and Au¹⁹⁸ have been examined for positrons by the "trochoidal" method of Thibaud. Br⁸⁰ is the only one of the above isotopes which was found to emit positrons as well as electrons. In studying Rb, a new activity of about 40-day half-life was found.
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William C. Barber (1947) studied this question.
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