Sweden (Continued) G/R.181 BONE AND RADIOSTRONTIUM The local radiation dose to the bone tissue and to the bone marrow after administration of bone-seeking isotopes is discussed. The figures are compared with the maximum permissible body burden. G/R.182 RADIATION DOSES TO THE GONADS OF PATIENTS IN SWEDISH ROENTGEN DIAGNOSTICS. SUMMARY OF STUDIES ON MAGNITUDE AND VARIATION OF THE GONAD DOSES TOGETHER WITH DOSE REDUCING MEASURES Switzerland G/R.27 LETTER FROM THE “SERVICE FEDERAL DE L’HYGIENE PUBLICQUE,” BERN Gives brief description of works on studies of atomic radiations conducted in Switzerland. Union of Soviet Socialist Republics G/R.37 ON THE METHODS OF INDICATING THE CHANGES PRODUCED IN THE ORGANISM BY SMALL DOSES OF IONIZING RADIATION Gives an enumeration of many methods which might be used as tests for small dosages; but these are based on certain symptoms which have not yet been worked out to give a quantitative response; i.e., vegetative-visceral symptoms, nervous symptoms (like the increase in threshold of gustatory and olfactory Sensitivity, etc.), skin vascular reactions, electroencephalogram. Blood symptoms are also described (alterations of thrombocytes and lack of a leucocytosis responseto the injection of Vit. B-12). Certain “immunological” symptoms are quoted, such as the bactericidal properties of saliva and of skin. G/R.39 CONTENT OF NATURAL RADIOACTIVE SUBSTANCES IN THE ATMOSPHERE AND IN WATER IN THE TERRITORY OF THE UNION OF SOVIET SOCIALIST REPUBLICS Studies content of natural radioactive substances in the atmosphere and in waters; geochemical considerations on mechanism of contamination of waters and description of radiohydrogeological methods. Gives methods of measurement of airborne activity and results, and includes tables giving contentof natural radioactive products in air and waters. G/R.40 STUDY OF THE ATMOSPHERIC CONTENT OF STRONTIUM-90 AND OTHER LONG-LIVED FISSION PRODUCTS Gives measurementsof airborne fission products (Sr™, Cs'37, Ce!#4, and Ru!®§); methods for collection of samples and of their radiochemical analysis; results and comments. G/R.41 ON THE BEHAVIOR OF RADIOACTIVE FISSION PRODUCTS IN SOILS, THEIR ABSORPTION BY PLANTS AND THEIR ACCUMULATIONIN CROPS Report made in two parts Part I. Experiments of absorption and desorption by soil of fission products and especially of isotopes such as Sr” + y®, Cs!37, zr®5 + Nb® and Ru + Rhi?8 are described. Theoretical analysis is also described. It was observed that Sr® + y® is absorbed through ion exchange reaction, and is completely or almost completely displaced from the absorbed state under the action of a neutral salt suchas CaCl,. Radioactive equilibrium between Sr*? and ¥*? is destroyed during the interaction with soil. 190 Vga at