° — . ot . : - ' . . . : . . ye ' ‘ . ' 1 - ” . “1 : dae, ot - . ‘ . TIT - BIOLOGY AND MEDICINE ‘ . 7 Total 1 LL 20 Biology Branch Radiation on dogs. A visit was made by the Chief of the B the Naval Radiological Defense Laboratory (NRDL ) in San Francisco NA te University of California Veterinary School for the purpose of dis projects on the effects of radiation on dogs that will be carried these laboratories. Within the next year about 280 dogs will be ry Oo ié) These animals will be maintained to determine the ef oO oO ct to various levels of radiation at the Veterinary School in Davis, California. radiation on life span and on the incidence of various diseases. NRDL will study the effect of various types of stress such as wor combination with radiation on dogs. Carbon 14. Counting techniques for C 14 are being continu improved. The organic group at the Radiation Laboratory of the Ufhi of California is using counters consisting of ionization chambers vibrating reed electrometer to count C 14 routinely. They canc disintegration per minute per milligram barium carbonate to an ac of one percent. The minimum amount of radioactive carbon that c tected is 0.01 disintegration per minute per milligram of barium Farbonate. 24 a i. ‘ * a mo my . ‘ . . ok TR 1 This accuracy in routine counting of C 14 permits the use Pf drugs and other organic compounds in human experiments at sufficiently flow - 13- ACHIVES . . a . “ [ oo 8 ‘ Biology Biophysics Medicine & ae ‘yt “Nol of pods 1 , wo - } ’ Jot ‘os woé‘t a? Seat, ~ we Mma iat aewah Se ny SLR as ety 5 aay . a : a we Ss AS io” * ae wae 1 ol - Lay es yee ye, The following number’ of researchProposals:were> approved ‘top renewal | oF negotiation.curing the monthya oe _ SN iia we Proposals Approved During August, A251