Canada (Continued) G/R.12 LEVELS OF STRONTIUM-90 IN CANADA Gives figures for Sr® and Sr®in milk powder at 7 stations, November 1955 — May 1956. The Sr* level averages 4.8 yc/g Ca. Cumulative total beta activity and calculated Sr* content of fallout analyzed by United States AEC from gummed papers, are summarized annually for 1953 to 1955. Independent Canadian measurements by methods which are not described differ from these by factors 2-5. G/R.98 RADIOCHEMICAL PROCEDURES FOR STRONTIUM AND YTTRIUM A detailed ion exchange procedure is given for the determination of radiostrontium in different samples. Methods are described for the treatmentof various organic materials. G/R.99 LEVELS OF STRONTIUM-90 IN CANADA UP TO DECEMBER 1956 Reports the results of radiochemical analysis for sr® activity in milk and milk products and human bone. Natural strontium content determination in milk and bone are also reported. G/R.129 DOSE FROM UNSEALED RADIO-NUCLIDES Calculations based upon information on shipments of radioisotopes show that the gonad dose to age 30 from unsealed radio-nuclides during 1956 in Canada is about 0.5% of the dose from the natural radiation sources. The main dose arises from 131, China G/R.8 REPORTS BY THE ATOMIC ENERGY COUNCIL OF THE EXECUTIVE YUAN OF THE REPUBLIC OF CHINA Briefly notes the radium content of certain Chinese and other waters and the occurrence of radioactive sailfish and dolphin in seas off Taiwan, June 1954. Czechoslovak Republic G/R.17 NATURAL RADIOACTIVITY OF WATER, AIR, AND SOIL IN THE CZECHOSLOVAK REPUBLIC Briefly draws attention to deviations from reciprocity and to the partial reversibility of many radiation induced phenomena, to the possible use of organisms ina state of abiosis as integral dose-indicators, to certain specially radiosensitive organisms and responses, and to questions of threshold. An extensive survey reviews many studies of natural radioactivity. Denmark G/R.101 MEASUREMENT OF ACTIVITY OF AIRBORNE DUST. MEASUREMENTS OF FALLOUT DEPOSITED ON THE GROUND Results of daily measured radioactivity in air (electrostatic filter method) and in precipitations (collection of rain water) in Copenhagen for the period 1956. Egypt G/R.46 PRELIMINARY REPORT ON ENVIRONMENTAL IODINE-131 MEASUREMENT IN SHEEP AND CATTLE THYROIDS IN CAIRO, EGYPT Contains measurementof radioactivity of I'3! deposited in thyroids of sheep and cattle which were brought from all over Egypt, Sudan, and north coast of Libya. Sampling was made during the period from May to October 1956. 178