Basic Clinical Radiobiology 2017

Relative risk is preferred to Absolute risk

! Relative risk (RR) expression of excess risk relative to the underlying (baseline) risk. If excess risk is zero, RR is 1 (100%). If excess risk equals the baseline risk, RR is 2 (200%) ! Absolute risk expression of excess risk based on the assumption that the excess risk from radiation exposure adds to the underlying risk

by an increment dependent on dose but independent of the underlying natural risk