energy threshold

in radiochemistry
https://doi.org/10.1351/goldbook.E02115
The limiting @K03402@ of a incident particle or energy of an incident photon below which a specified process cannot take place.
Source:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2519 [Terms] [Paper]