Illustration of cancer mortality risk from ionizing radiation. Fatal (a) solid cancer; (b) leukaemia rates (1950–2000) in people exposed to radiation from the Hiroshima and Nagasaki atomic bombs using data presented in ref. . Mortality rates are per 10,000 people. In the 86,611 member cohort, of the 6061 cancer deaths observed in all persons exposed to more than 0.005 Sv, approximately 578 were attributed to radiation exposure.