The process by which an unstable atomic nucleus loses energy by emitting ionizing particles (ionizing radiation). The emission is spontaneous - in that the nucleus decays without collision with another particle or atom. The decay is a stochastic (i.e

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1. The process by which an unstable atomic nucleus loses energy by emitting ionizing particles (ionizing radiation). The emission is spontaneous - in that the nucleus decays without collision with another particle or atom. The decay is a stochastic (i.e