CESIUM-137 BODY BURDENS AND THEIR VARIATIONS IN NORWEGIAN SCHOOL BOYS AKSEL STR@MME State Institute for Radiation Hygiene and the Norwegian Radium Hospital, Oslo, Norway ABSTRACT The global distribution of fallout of radionuclides from nuclear-weapon tests has not been uniform. It has been eSpecially high in Norway; therefore determinations of the level of fallout have been of particular interest. As a part of the investigations reported, '°"Cs body burdens and potassium levels were studied in 22 school boys from one school in Oslo with a whole-body counter at the Norsk Hydros Institute for Cancer Research. Examinations of the boys were made in March 1963, October 1963, March 1964, and October 1964. BODY BURDENS AND THEIR VARIATIONS As shown in Table 1, most of the boys (17) were born in 1946. The case numbers were assigned on the basis of their '’Cs body burden at the first examination. Number 1 was assigned to the boy with the lowest body burden; number 22 was assigned to the boy with the highest. These numbers are maintained throughout this paper. Figure 1 shows the height and the weight of the boys in March 1963 and October 1964. Table 2 shows the height and weight of the boys also. The numbers in parentheses are the case numbers. Note that the average height in centimeters increased only 1 cm, from 179 to 180 cm. The weight has, on the average, increased from 67.5 kg to 69 kg. Someof the boys increased in weight only slightly, whereas some gained several kilograms; weight. on the other hand, there are also some who decreased in 959

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