Physics Bucharest 2017

Quantities expressing risk for tumor induction

Excess Absolute Risk EAR = fraction of irradiated patients that get a radiation-induced tumor often applied units: %/Sv or PY·Gy

Relative Risk

baseline tumors + radiation-induced tumors

(by definition, RR >1)

RR =

baseline tumors

Excess Relative Risk

radiation-induced baseline

ERR =

(ERR = RR-1)

If ERR is X%  due to radiation, total numbers of tumors increases by X%

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