DEATH RATE AFTER IONIZING RADIATION 



291 



5 10 15 20 



Age (months) 



Fig. 11. Mortality rate of RF male mice djdng with leukaemia other than thymic or 

 myeloid type, as influenced by X-irradiation early in life (arrow denotes age at exposure). 



O Non-irradiated control (341/882 mice); A 100-200 rads (268/897 mice); • 300 rads 

 (371/1905 mice). 



100 



450 600 

 Age (doys) 



900 1050 



Fig. 12. Age-specific mortality rate of RF female mice dying with ovarian tumour, as 

 influenced by X-rays, TEM, or HN2 administered early in life (arrow denotes age at treatment). 

 See Methods for doses. 



O Untreated control (9/130 mice); • HN2 (21/160 mice); A TEM (91/157 mice); Q X-ray 

 (96/259 mice). 



