a unit that quantifies the biological effectiveness of an absorbed dose of ionizing radiation, obtained by multiplying the absorbed dose by dimensionless factors that account for the kind of radiation, its energy, and the nature of the absorber: measured in Sievert or rem.
Another measure of the potential impact of accelerator-produced penetrating radiation is the population dose equivalent.
The unit of the effective dose equivalent is the rem.
British Dictionary definitions for dose equivalent
a quantity that expresses the probability that exposure to ionizing radiation will cause biological effects. It is usually obtained by multiplying the dose by the quality factor of the radiation, but other factors may be considered. It is measured in sieverts (SI unit) or rems