Abstract
MEASUREMENTS on radioactive fall-out in air and rainwater in different parts of the world from 1954 onwards showed that during late winter and spring an increase in specific activity was observed. This increase was attributed by Stewart1 and Machta2 to seasonal effects while it was attributed by Martell3 mainly to the testing schedule of polar explosions. The presence of ‘spring-peak’ was observed in India and other countries from the measurements made in the spring of 1960 as there were no tests between November 4, 1958, and February 13, 1960.
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References
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Machta, L., Health and Safety Lab. Rep., No. 42 (1958).
Martell, E. A., Science, 129, 197 (1959).
Vohra, K. G., Bhatnagar, V. S., and Rangarajan, C., Nature, 191, 747 (1961).
Lindblom, G., Nature, 193, 866 (1962).
Kuroda, P. K., et al., Science, 137 991 (1962).
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VOHRA, K., RANGARAJAN, C. & SARADA, G. Seasonal Variations of Cæsium-137 in Air at Ground-level during 1960 and 1961. Nature 197, 1092 (1963). https://doi.org/10.1038/1971092a0
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DOI: https://doi.org/10.1038/1971092a0
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