radioactivity

https://doi.org/10.1351/goldbook.R05092
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Sources:
Green Book, 2nd ed., p. 22 [Terms] [Book]
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2523 [Terms] [Paper]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 988 [Terms] [Paper]