Development of a Prompt Gamma Neutron Activation Analysis Facility at the University of Missouri Research Reactor and Obsidian Identification PDF Download
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Author: Abdul-Salam Gubreal Hanna
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Category :
Languages : en
Pages : 0
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Author: Abdul-Salam Gubreal Hanna
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ISBN:
Category :
Languages : en
Pages : 0
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Category : Dissertations, Academic
Languages : en
Pages : 764
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Category : Dissertations, Academic
Languages : en
Pages : 572
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Category : Nuclear energy
Languages : en
Pages : 376
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Category : Dissertation abstracts
Languages : en
Pages : 604
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Author:
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Category : Nuclear engineering
Languages : en
Pages : 608
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Category : Nuclear reactors
Languages : en
Pages : 74
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Category :
Languages : en
Pages : 11
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A gamma ray spectrometer at LBNL (the Luis W. Alvarez Iridium Coincidence Spectrometer), that was specifically designed for high sensitivity measurements of iridium abundances, has been significantly modified in order to provide precisions of measurement in neutron activation analysis of obsidian significantly better than previously obtained (about 1%). Repeated measurements on a single sample of obsidian from a deposit near Chivay, Arequipa, Peru, showed a precision (average coefficient of variation) of 0.19% for the 6 best-measured elements, the value anticipated from the known random errors of measurement. In measurement of samples made from 7 different obsidian nodules from two locations near Chivay, a group of 5 had a spread of 0.30% for the 6 elements measured with counting statistics of better than 0.3% (and 1.8% for the remaining 6 elements). The data suggest there are source inhomogeneity and/or sample preparation contamination errors totaling 0.24 " .05% for the 6 best measured elements. A sixth obsidian sample could be distinguished from the main group because it differed by +0.8% for most elements, and the last sample could be easily distinguished because several elements differed by more than 1%. The precision of measurements now being developed may provide a significantly more precise determination of the provenience of obsidian artifacts than has been heretofore possible. Also the techniques of measurement developed for obsidian will provide even better precisions with pottery, as many elements are more abundant in pottery than in obsidian.
Author: Argonne National Laboratory
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Category : Nuclear reactors
Languages : en
Pages : 92
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Author: Adon A. Gordus
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Category : Nuclear activation analysis
Languages : en
Pages : 3
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Concentrations of elements such as manganese, scandium, lanthanum, rubidium, samarium, barium, and zirconium in obsidian samples from different flows show ranges of 1000 percent or more, whereas the variation in element content in obsidian samples from a single flow appear to be less than 40 percent. Neutron-activation analysis of these elements, as well as of sodium and iron, provides a means of identifying the geologic source of an archeological artifact of obsidian.
