energy resolution

in radiochemistry
https://doi.org/10.1351/goldbook.E02113
A measurement, at given @E02101@, of the smallest difference between the energies of two particles or photons capable of being distinguished by a radiation @S05837@.
Source:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2519 [Terms] [Paper]