Abstract
THE presence of cæsium-137 in human beings was established in the United States in 1955 (ref. 1) and measurements of the average levels in a small group of unexposed subjects have been made at this Establishment since early 1956. The results of these measurements showed that there was a slow, irregular increase in the cæsium-137 content to a maximum in the summer of 1959, after which the level declined to a lower value in April 1962 than at any time since our measurements began2,3. The resumption in September 1961 of largescale atmospheric testing of high-yield nuclear weapons did not result in any detectable increase in cæsium-137 contents until after April 1962, although the presence of short-lived zirconium-95 in human beings was demonstrated prior to this3. In this communication we are reporting the results of our measurements of cæsium-137 in human beings during April 1962–April 1964; we have used throughout the technique described previously3, which was intended primarily for estimating the lung contents of zirconium-95/niobium-95. The results of serial measurements of the latter radionuclides will be reported elsewhere.
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References
Miller, C. E., and Marinelli, L. D., Science, 124, 122 (1956).
Rundo, J., Nature, 188, 703 (1960).
Rundo, J., and Newton, D., Nature, 195, 851 (1962).
Rundo, J., Mason, J. I., Newton, D., and Taylor, B. T., Nature, 200, 188 (1963).
Rundo, J., Brit. J. Radiol., 37, 108 (1964).
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RUNDO, J., NEWTON, D. Increase in the Cæsium-137 Content of Man due to Radioactive Fall-out, 1962–64. Nature 203, 537–538 (1964). https://doi.org/10.1038/203537a0
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DOI: https://doi.org/10.1038/203537a0
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