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Excess Absolute Risk
EAR
= fraction of irradiated patients that get a radiation-induced tumor
often applied units: %/Sv or PY·Gy
radiation-induced
baseline
ERR
=
Excess Relative Risk
(ERR = RR-1)
If ERR is X%
due to radiation, total numbers of tumors increases by X%
baseline tumors + radiation-induced tumors
RR
=
baseline tumors
(by definition, RR >1)
Relative Risk
Quantities expressing risk for tumor induction