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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.