ionizing radiation

https://doi.org/10.1351/goldbook.I03216
Any @R05048@ consisting of directly or indirectly ionizing particles or a mixture of both, or photons with @E02101@ higher than the energy of photons of @UT07492@ light or a mixture of both such particles and photons.
Source:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2520 [Terms] [Paper]