Use of radiation in medicine

Procedure Effective Dose
(mSv)
Lifetime risk of
cancer
Simple chest x-ray 0.05 2.5 in 1,000,000
Abdominal x-ray 0.5 2.5 in 100,000
Pelvis x-ray 0.4 2 in 100,000
CT scan head 2 1 in 10,000
CT scan chest 7 3.5 in 10,000
CT scan abdomen 7 3.5 in 10,000
Angiography 1 to 20 0.5 to 10 in 10,000
Nuclear medicine 2-10 1 - 5 in 10,000

Approximate risk of death from common causes in the US*

CauseLifetime risk of death
Fall1 in 100
Motor vehicle incidents1 in 100
Drowning1 in 1,000
Bicycle accidents3 in 10,000
Lightning7 in 1,000,000

*US National Safety Council (2019)