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Effect of radiation on survival (LD50/30) in 4 mouse strains. In groups of 7~13, mice were exposed to 7 Gy TBI from a cesium-137 gamma source. Mouse survival and death rates were recorded. Significant differences existed between the C57BL/6 and BALB/c strains; survival in the F1 hybrids was significantly increased as compared to the BALB/c strain.
