T 1 i I 1 to a | T | T 1 J. 4 io* & MAN NAN - DOG y “RAY “ GUINEA PIG» MEAN AFTER SURVIVAL (DAYS) MOUSE h -1.32 ~0.40 § 16,500DAYS 4,000 « -0.12 - 1,400 « “ -0.04 NEUTRON -0.40 4 500 «° 650 « 10° BO YSE ty) ~ SC 2 3 4 5 ~J 1G he BIOUSE (NEUTRON) RAD/DAY Figure XV. A plot of tog mean after-survival as a funetton of datly exposure according to equation and S, 5S, = 5, e the survival at dose-rate I. are shown for mammaltan spectes. 23k, Mole k D where 5S, ts the survival The values of k and 5, Data from Grahn and Sacher [G1] [M2] discussed in general terms the problem of extrapolation be- tween species. He noted that experimental investigations are of value when they lead to quantitative generalizations that must include within themselves some allowance for any species difference. respect: Mole mentioned three possibilities in this the opacification of the lens of the eye, which may depend inversely