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A Study of Fission Yields with Isotope Dilution and the Mass Spectrometer

The relative abundances of the stable and long-lived Isotopes of rubidium, cesium, strontium,
cerium, neodymium, and samarium resulting from the therĀ­mal neutron fission of U^235 and Pu^239 were determined mass spectrometrically. Special precautions were taken to eliminate or at least minimize contamination of the sub-microgram quantities of fission products with the naturally occurring elements. By using isotope dilution the yields of isotopes of different elements were related with very good precision. Sufficient information was available to evaluate from such results the absolute cumulative yields of twenty-seven mass chains for U^235 fission. It was possible from the results of the present study of make a quantitative comparison between the yields of the heavy fragments for U^235 and Pu^239 fission, with special attention being given to the fine structure supposedly resulting from the influence of nuclear shells involving 50 and 82 neutrons. / Thesis / Master of Science (MS)

Identiferoai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/26347
Date09 1900
CreatorsPetruska, John
ContributorsTomlinson, Richard, Chemistry
Source SetsMcMaster University
LanguageEnglish
Detected LanguageEnglish
TypeThesis

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