نتایج جستجو برای: thorium
تعداد نتایج: 2095 فیلتر نتایج به سال:
A method of epithermal neutron activation analysis for uranium and thorium is discussed in relation to other rapid analytical methods for these elements. Caledonian granites are divided into four main groups on the basis of U and Th contents: (a) a group of evolved late granites with high U and Th contents and high Th/U ratios, (b) a group of uranium-enriched mineralized granites, (c) granites ...
Cross sections for the formation of (225,227)Ac, (223,225)Ra, and (227)Th via the proton bombardment of natural thorium targets were measured at a nominal proton energy of 800 MeV. No earlier experimental cross section data for the production of (223,225)Ra, (227)Ac and (227)Th by this method were found in the literature. A comparison of theoretical predictions with the experimental data shows ...
All of the writers wish to acknowledge the support of the Oak Ridge National Laboratorv under Subcontract 1491. Two of us (J. A. S. A. and J. J. W. R.) have received substantial funds under Grant C-009 from the Robert A. Welch Foundation for studies on the geochemistry of thorium. The Robert A. Welch Foundation under Grant K-054b also provided one of us (J. A. S. A.) with funds for both the dev...
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