bong tern effects in survivors: tumor incidence and catar:ct The Life spen, induction will be stidiied in surviving nice exposed both to neutrons end gamna reys. These animels will be sent by air to Furth at Osx Ridge f-r observation. Ae Gamma rey survivors: There will be about 200 enimals at 2ach of the 29 ganca rey Stations earner’ed for long term survival Studies. Following the shot, they will be nooled in grouns of four (covering a dose range of 100 roentgens). Not more then 4200 animals will be returned to the states. “hey will be accompanied by controls (? how many) which vill be given eauivalent doses of 750 k.v. x-rays (for each individual Zroun, not the pooled groups of four) according to the mouse dosimetry messurements (My own orinion is that since mouse dosimetry is : rather new tool for calibretion of rediation they should also have control aninals given doses bused on the chysical measurements of what the animels received. “his would alley possible controversy in the future ©«3 to the signif-icence of the results.) life span, The difference in tumor incidence and cateract develonoment betvreen the animals exnosed in the field and those ziven esauivalent deses of ?50 k.v. x-reys wil’ be studied. Only 200 non-irreldisted controls will ac Tomnany the exnosed animels. The statisticians felt that no nore were necessary since the differences in lonz tern esftects hetuasny DO ARCHIVES