Dose 2016

5.2 Appendix: Alternative definition of fluence

We follow a proof given by A. B. Chilton in 1977 (Health Physics 34, 1978)

Consider the small irregular volume of interest ∆ V.

Ω

Assume a radiation field with particles of any arbitrary directional distribution . However, initially consider only those particles going in the direction Ω .

∆ V

55