https://doi.org/10.1351/goldbook.R05404
Non-SI unit of exposure to X- or γ-radiation: \(\rm{R} = \pu{2.58E-4 C kg}\).
Sources:
Green Book, 2nd ed., p. 113 [Terms] [Book]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 991 [Terms] [Paper]