New Low Mass Isotopes of Emanation (Element 86)

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Among the spallation products obtained from the 350-Mev proton bombardment of Th{sup 232} they have identified two gaseous alpha-emitters which apparently do not decay into any presently known alpha-decay chains. The half-lives observed for the decay of the alpha-activities are 23 minutes and 2.1 hours. These half-lives may be principally determined by an unknown amount of orbital electron capture. At least one alpha-emitting daughter (about 4 hours half-life) has been observed to grow from a gaseous parent, but it has not been determined whether it arises from alpha-decay or electron-capture. Since these gaseous atoms emit alpha-particles it is assumed that ... continued below

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Ghiorso, A.; Meinke, W.W. & Seaborg, G.T. September 5, 1949.

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Description

Among the spallation products obtained from the 350-Mev proton bombardment of Th{sup 232} they have identified two gaseous alpha-emitters which apparently do not decay into any presently known alpha-decay chains. The half-lives observed for the decay of the alpha-activities are 23 minutes and 2.1 hours. These half-lives may be principally determined by an unknown amount of orbital electron capture. At least one alpha-emitting daughter (about 4 hours half-life) has been observed to grow from a gaseous parent, but it has not been determined whether it arises from alpha-decay or electron-capture. Since these gaseous atoms emit alpha-particles it is assumed that they are isotopes of element 86 (emanation or radon) rather than a lighter rare gas. if they were heavy isotopes such as Em{sup 221} or Em{sup 223}, both unknown, they would decay into known alpha-decay series, the neptunium and actinium series, respectively, and so would grow known short lived alpha-emitters which would have been detected. It thus appears reasonable that they must be lighter than the known emanation isotopes.

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  • Report No.: UCRL--438
  • Report No.: AECU-460
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/932506 | External Link
  • Office of Scientific & Technical Information Report Number: 932506
  • Archival Resource Key: ark:/67531/metadc897408

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  • September 5, 1949

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 3, 2016, 8:13 p.m.

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Ghiorso, A.; Meinke, W.W. & Seaborg, G.T. New Low Mass Isotopes of Emanation (Element 86), report, September 5, 1949; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc897408/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.