Relative Biological Effictiveness (RBE) usually refers to the damage caused by

Relative Biological Effectiveness (RBE) usually refers to the damage caused by Radiation.
Relative biological effectiveness (RBE) is defined as the ratio of a dose of standard radiation to the dose of test radiation to produce the same biological effects.
RBE is a relative measure of the damage done by a given type of radiation per unit of energy deposited in biological tissues.