Union of Soviet Socialist Republics (Continued) Strontium: about 10% given is absorbed in intestine and 1.45% is retained in bones, and twenty times less in the soft tissues. The rest is excreted by milk or urine. Cesium: about 25% given is absorbed in intestine —onefifth of this is retained in muscle and less than one tenth of this amount in other organs or skeleton; the rest is eliminated in the milk or urine. G/R.53 Report consists of two articles 1. THE EFFECTS OF IONIZING RADIATIONS ON THE ELECTRICAL ACTIVITY OF THE BRAIN (a) Grigorev’s research work states: y rays depress electrical action of humanbrain. Does not confirm Eldrid-Trowbridge, who do not find effect on monkey. (b) Describes effects of 8 rays of P® (0.05 mc/kg up to 1 mc/kg) on electro- encephalogram of dogs. This was followed by radiation sickness (if dose >0.5 mc/kg) and hematological effects. A special implantation method of the electrodes is used. Injection of 0.09 mc/kg gives change in amplitude 5 minutes after (reduction in amplitude). Id. when 0.5 mc —lowering of electrical activity lasts for several days. For dosages above 0.1 mc, part of the repression of brain activity is probably a result of the radiation sickness induced by such high dosages. 2. ON THE BETA RADIATION ACTIVITY OF HUMAN BLOOD Report on radioactivity of human blood: 100 cc of normal blood have a radio- activity of 1.7 to 3.64 107! curies (due to K**). Permits determination of K con- fg ise tent of whole blood. Same values are found in different pathological conditions. No data on people working with radioactive material. G/R.160 DRAFT OF CHAPTER F PREPARED BY THE DELEGATION OF THE U.S.S.R. TO THE SCIENTIFIC COMMITTEE ON THE EFFECTS OF ATOMIC RADIATION G/R.163 DATA ON THE RADIOACTIVE STRONTIUM FALLOUT ON THE TERRITORY OF THE U.S.S.R. TO THE END OF 1955 G/R.196 DRAFT CHAPTER ON “GENETIC EFFECTS OF RADIATION” FOR THE REPORT TO BE TRANSMITTED BY THE SCIENTIFIC COMMITTEE ON THE EFFECTS OF ATOMIC RADIATION TO THE GENERAL ASSEMBLYIN 1958 G/R.197 DRAFT CHAPTER ON “CONCLUSIONS AND RECOMMENDATIONS” FOR THE REPORT TO BE TRANSMITTED BY THE SCIENTIFIC COMMITTEE ON THE EFFECTS OF ATOMIC RADIATION TO THE GENERAL ASSEMBLYIN 1958 G/R.198 CONTAMINATION OF THE BIOSPHERE IN THE VICINITY OF LENINGRAD BY THE PRODUCTS OF NUCLEAR EXPLOSIONS Contains the description of methods used for monitoring the fallout deposition. Results for the period 1953-1957 are given. Data on specific activity of water from the river Neva, the sea, and the water supply system are also included. Accumulated radioactivity on the ground and external dose from radioactive deposit are then computed. Special attention is given to the contamination of the biosphere by Sr®, Data are based on Hunter and Ballou’s calculation. G/R.199 STUDY OF THE STRONTIUM-90 CONTENTOF THE ATMOSPHERE, SOIL, FOODSTUFFS, AND HUMAN BONES IN THE USSR The Sr* content of the air, soil, milk, and cereals in various districts of the USSR was determined by radiochemical analysis. Preliminary results on the Sr® content in bones from children in the Moscow district give the average value of 2, 3 S.U. in the second half of 1957. A few data on Cs!3" concentration in the air are attached. 192 , -