A type of radiation that consists of a stream of positively charged particles - which have an atomic mass of 4 and a charge of +2 (a helium nucleus). When the particle is ejected from a nucleus - the mass number of the nucleus decreases by four units

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1. A type of radiation that consists of a stream of positively charged particles - which have an atomic mass of 4 and a charge of +2 (a helium nucleus). When the particle is ejected from a nucleus - the mass number of the nucleus decreases by four units