CADMIUM-109 has been detected in rainwater collected at the Institute of Nuclear Sciences site, Lower Hutt, New Zealand. This isotope is presumed to have been produced during the high altitude nuclear detonation, ‘Starfish Prime’, carried out over Johnston Island on July 9, 1962. The cadmium-109 was introduced at an altitude of 400 km to investigate distribution and fallout for debris injected at the outer edge of the ionosphere1.
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Slater, L. P., U.S. Atomic Energy Comm. Health and Safety Lab. Publ. HASL-142, 303 (1964).
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McCALLUM, G., WOODWARD, R. Cadmium-109 in New Zealand Rainwater. Nature 209, 69–70 (1966). https://doi.org/10.1038/209069b0
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