Survival response curves for radiation and radiation combined injury. Groups of male CD-1 mice were exposed to 0, 0.5, 1, 2, 4, 6, 8 or 10 Gy radiation by timed exposure to 137CsCl without or with combined 25% TBSA burn injury. Mice were monitored daily to measure mortality over a 28 day time course. The (*) indicates significant mortality compared to sham mice by the log-rank statistical test for n = 16 mice per group.