Approximate Absolute Risks of Cancer Mortality (BEIR III) Dose Percent of Normal Cancer Deaths Cancer Mortality 1 mrad/yr alpha to lung 0.1 in 100,000 0.03 3 mrad/yr alpha to bone 0.3 in 100,000 0.10 0.1 in 100,000 0.03 40 mrad/yralpha to bone surface Normal Annual Risk of Cancer Death 900 mrem/yr whole body (low L 170 mremye whole body low LET (0.02 mrem/hr} Los Alamos 300 in 100,000 4 in 100,000 1.3 1.5 in 100,000 0.5