quantum of radiation

of radiation
https://doi.org/10.1351/goldbook.Q04986
An elementary particle of electromagnetic energy in the sense of the wave-particle duality.
See:
photon
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2267 [Terms] [Paper]