|4OaT PERCENTAGE LIFE SPAN SHORTENING PERCENTAGE LIFE SPAN SHORTENING t : p= An T ae X- FIND GAMMA-RAYS TA 2! [A 2) SINGLE ACUTE EXPOSURE ALL SPECIES ¢ ¢ ba T WH oT C ¢ R co. 2a 7 Pe ° - cee ee R . th et on or o¢ A o R + 20H { a 74 Pa DOSE t Ba { AoA { | Ane <RAD > Figure IV. Dose-effect data for ltfe-shortening tn various mammaltan spectes following acute stngle exposure, compared with the response of the mouse. The dotted line is the best fit to the data for the mouse in Figure II, as in equ. (6). Vartous experiments.