Approximate Absolute Risks of Cancer Mortality (BEIR III) Dose Cancer Deaths Percent of Normal Cancer Mortality 1 mrad/yr alpha to lung 0.1 in 100,000 0.03 3 mrad/yr alpha to bone 0.3 in 100000 0.10 0.1 in 100,000 0.03 40 mrad/yralpha to bone surface Normal Annual Risk of Cancer Death 500 mrem/yr whole body (low L 170 mrem/jyr whole body low LET (0.02 mrem/hr) Los Alamoe 300 in 100,000 4 in 100,000 1.3 1.5 in 100,000 05