152. The total number of casuafties and the extent of material damage that are the result of one nuclear explosion may vary rridely depencling on a number ofAl35 /39? Ens_L1Sn Annex factors ' sone of which are not fully understood. According to one source f3/ tneHiroshima bomb, estimated to be 13 kt., caused the death of about TO,OO0 civiliansvithin a month, and some further 8O,O0O were injured. A larger lolrl, ee tt.,against Nagasaki gave easualties of J+O,OOO and 20,000 coffespond.ingly. Thediscrepancy between the tvo outcones has been ascribed to th; diff;rent topographiesof the tffo cities. fn Nagasaki there are a number of ridges separating differentparts of the city, which 1ead. to a fower average popufation aenlity .ni to "o." weakening of the air brast in certain areas. within the r ran. -radius from ground-zeao, however, the casualties (dead and inJured) vere about 95 per cent of the totafpopulation in both cases, with a sonewhat higher incidence of fatalities inNagasaki "