COPY Simtee-Blesdical Frogras It was recemmended that a realirtic mumter for the serial sacrifice study ves tvo animals cf each epectes per period. It was recomended that all these animls te exporved to the same doce 6f radiation, one that would be at least the LD,,.9. The recamuented doze wan about 550 P. it is eyperent that ceatrol etudies should be done to deteraica accurately the mort cuitable dimensions of the yeriode: i.e. Bourse, doys, ete. Reepectfully subsaitted, GainUd Ve LencY, #3. Lirector COpy ec: . Eicpedi¢al Fregray ASt& Soist Taek Pores $3 Dr. Usrrea Br. Graves Capt. Dreeger eck wiitNO FRC