2. Definitions of Basic Quantities and Terms

Abstract

The fluence, F, is given by F 1⁄4 dN=da, where dN is the number of particles incident on a sphere of cross-sectional area da. The energy fluence, C, is given by C 1⁄4 dR=da, where dR is the radiant energy incident on a sphere of cross-sectional area da. The radiant energy, R, is the energy (excluding rest energy) of the particles that are emitted, transferred, or received. The distributions, FE and CE, of the fluence and energy fluence with respect to energy are given by FE 1⁄4 dF/dE, and CE 1⁄4 dC/dE, where dF is the fluence of particles of energy between E and E þ dE, and dC is their energy fluence. The relationship between the two distributions is given by CE 1⁄4 EFE.