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Aperiodic frequency is the rate of incidence or occurrence of non-cyclic phenomena, including random processes such as radioactive decay. It is expressed in units of measurement of reciprocal seconds (s−1) or, in the case of radioactivity, becquerels.
- Lombardi, Michael A. (2007). "Fundamentals of Time and Frequency". In Bishop, Robert H. (ed.). Mechatronic Systems, Sensors, and Actuators: Fundamentals and Modeling. Austin: CRC Press. ISBN 9781420009002.
- "Units with special names and symbols; units that incorporate special names and symbols". SI Brochure: The International System of Units (SI) (8th ed.). Section 2.2.2. 2014.
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