Japan (Continued) PART 4. THE AIRBORNE RADIOACTIVITY IN JAPAN Analyses of airborne radioactivity by filter and by electrical precipitator are described and compared. Results of analyses 1954-1956 show poor correlation between peaks of contamination and trajectories of high-level air masses. PART 5. REPORT ON THE SYSTEMATIC OBSERVATIONS OF THE ATMOSPHERIC RADIOACTIVITY IN JAPAN Describes methods of collection and analysis of fallout in dust, rain, and snow, and of airborne radioactivity, as used in a wide survey at meteorological stations. Results from April 1954—March 1956 are summarized and discussed and the cumulative depositions of Sr® are calculated. PART 6. ON THE DISTRIBUTION OF NATURALLY RADIOACTIVE NUCLIDES IN JAPANESE ISLANDS Surveys of the distribution of naturally radioactive nuclides in Japanese waters and minerals are reviewed and summarized. PART 7. RADIOCHEMICAL ANALYSIS OF RADIOACTIVE FALLOUT OBSERVED IN JAPAN Presents methods and results of radiochemical analyses of ash from the fishing boat No. 5 Fukuryu Maru and of rainwater and soil samples in Japan. PART 8. FISSION PRODUCTS IN WATER AREA AND AQUATIC ORGANISMS Describes fallout distribution and uptake generally, with special reference to water and aquatic organisms andto the problem of sr®. G/R.43 THE EFFECT OF MOMENTARY X-RAY EXPOSURE IN A SMALL DOSE UPON THE PERIPHERAL BLOOD PICTURE Decrease in lymphocyte number after single 60 mr exposure in humans. Decrease in lymphocyte count varies from 10 to 50%—-the maximum drop occurs 30 minutes after irradiation, and may be followed by an increase in mops - lymphocyte count. G/R.44 HEMATOLOGICAL EFFECTS OF SINGLE EXPOSURE TO SMALL DOSES OF X-RAY Hematological effects during routine chest examinations. Dosages up to 3 r. Most constantly observed are: increase in neutral red bodies and Demel’s granules in lymphocytes and late decrease in mitochondrial index of lymphocytes during the four-hour period following the irradiation. The cytochemical identification of these various granules and their biological significance should be established unequivocally. G/R.45 MORPHOLOGICAL CHANGES OF PLATELETS IN CHRONIC RADIATION INJURIES Platelet morphology in chronic irradiation injury in rabbits (chronic 0.1152 or 0.2312), X-ray workers (dosage not evaluated) and persons exposed to atomic bomb within 4 km from epicenter (9 years after the exposure). Even if platelet count is normal, area index (proportional to average area) is increased markedly, and may remain so 9 years after irradiation and is not necessarily related to low platelet count. Other morphological changes are also shown. This observation should be repeated by other groups. G/R.41 CURRENT AND PROPOSED PROGRAMMES OF RESEARCH AND INVESTIGATION RELATED TO RADIATION GENETICS IN JAPAN A brief survey of current and planned research in Japan relevant to radiation genetics, covering both human surveys and experimental work. 182 5,