STRONTIUM-90 IN MAN. III
In January of 1958 the average burden of strontiuin90 in the skeletons of adults throughout the world was 0.19 ic ic c of strontium-90 per gram of calcium. This burden is independent of age above the age of 20. The concentrations of strontium-90 in bone differ less than the total fall-out, as between the Northern and Southern hemispheres. This is nttributable largely to the movement of food, particularly of powdered milk and wheat from the Northern Hemisphere into the Southern Hemisphere. A theoretical curve for concentration of strontium-90 versus age has been constructed on the basis of findings on levels of strontium-90 in the diet for the past five years, data on bone growth reported by Mitchell et al., and a discrimination factor of 4 for calcium against strontium from diet to bone. This curve corresponds closely to that for actual data from bone samples from the zone of Western culture of 20 to 60 N. The average conccntration of strontium-90 in the skeleton for all people in the world as of January l958 was about 0.52 ic ic c of strontium-90 per gram of calcium. On the basis oI data on the strontium-90 in diet and bone, the world deposition, and the level of strontium- 90 in the stratosphere at the end of l958, curves have been drawn to show the anticipated concentrations of strontium-90 in the diet of individuals in the area of Western culture of 20 to 60 N and in newly depcsited bone to the year A.D. 2000. It is estimated on the basis of these data that the maximum concentration in young ehildren will occur about l966. A histogram representing 838 sampies indicates the present distribution of strontium-90 in the adult population of the world. lt is assumed that this reflects the actual spread of all age groups as a result of dietary variations throughout the world. The indicated distribution may be somewhat wider than the actual distribution, due to analytical errors and biological variation in the ratio of single bone to whole skeleton. lt is predicted that in 1966 the average young child in the world will have a skeletal concentration of strontium-90 of about 4 ic ic c of stronitum-90 per gram of calcium; that 10 per cent may have a concentration of 8 ic ic e; that 1 per cent may have a level of 20 ic e; and that none will have a levol exceeding 80 ic ic e of strontium-90 per gram of calcium. (auth)
- Research Organization:
- Columbia Univ., New York
- NSA Number:
- NSA-13-013199
- OSTI ID:
- 4262011
- Journal Information:
- Science See Saiensu, Journal Name: Science See Saiensu Vol. Vol: 129; ISSN SIENDS1
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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