Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleUnidentified Excess Alpha-Activity in the 4.4-Mev Region in Natural Thorium Samples.AuthorsCHERRY, R. D.; RICHARDSON, K. A.; ADAMS, J. A. S.PublicationNature, 1964, Vol 202, Issue 4933, p639ISSN0028-0836Publication typeAcademic JournalDOI10.1038/202639a0