Abstract
OUR nuclear centre carries out a complete programme of environmental radioactivity measurements on air, fall-out, surface water and so on. We report high values of the delayed beta activity on paper filters collected on a daily basis at airborne radioactivity collection stations on December 18–20, 1968. We began by looking for possible accompanying alpha activity, which was not found, but the gamma spectrum had a surprising shape.
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References
Lockhart, L. B., Patterson, R. L., Saunders, A. W., and Black, R. W., Science, 132, 154 (1960).
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DE FRANCESCHI, L., GENTILI, A., GREMIGNI, G. et al. Tungsten Radioisotopes in the Atmosphere near Pisa, Italy. Nature 224, 571–573 (1969). https://doi.org/10.1038/224571b0
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DOI: https://doi.org/10.1038/224571b0
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