An unidentified alpha activity of thorite

Petrzhak, K.A.; Yakunin, M.I.; Ter-Akop'yan, G.M.

doi:10.1007/bf01125117

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1979

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“…These findings could not be reproduced by Petrzhak et al, who separated the heavy fraction of Conway granite by sedimentation in bromoform and prepared a spectrometric sources by a cathode sputtering process, taking care not to lose any volatile oxides. 22 They found no excess activity at 4.4 MeV. Gentry et al 21 also failed to find evidence of the 4.4-MeV « emitter in Conway granite.…”

Section: Introductionmentioning

confidence: 96%

Search for an elusive 4. 4-MeV. cap alpha. emitter in uranium minerals

Dougan¹,

Illige²,

Hulet³

1979

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Introduction 1 Experimental Procedures Source of Materials Preparation and Analysis of the Sample Results and Discussion II Acknowledgments References in THE SEARCH FOR AN ELUSIVE 4.4-MeV a EMITTER IN URANIUM MINERALS ABSTRACTWe describe our search for an unidentified 4.4-MeV a-emitter in Belgian Congo pitchblende and uranium raffinates, and we give a history of observations of 4.4-MeV ac tivity over the last 55 years in radiogenic haloes, zinc ores, monazite, thorite, huttonite, ultrabasic and other abyssal rocks, osiniridium, uranium ores, and raffinates of uranium. We show no evidence of excess 4.4-MeV activity in any of the chemically separated fractions in vestigated. We give upper limits for 4.4-MeV a activity in each of four studied samples.

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Section: Introductionmentioning

confidence: 96%