Giant Radioactive Halos: Indicators of Unknown Radioactivity?

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Science  14 Aug 1970:
Vol. 169, Issue 3946, pp. 670-673
DOI: 10.1126/science.169.3946.670


A new group of giant radioactive halos has been found with radii in excess of anything previously discovered. Since alternate explanations for these giant halos are inconclusive at present, the possibility is considered that they originate with unknown alpha radioactivity, either from isomers of known elements or from superheavy elements.

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