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Non-destructive determination of trace-element concentrations. Annual progress report [electronic resource].

Published:
College Park, Md. : University of Maryland (College Park, Md.), 1978.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
Pages: 69 : digital, PDF file
Additional Creators:
University of Maryland (College Park, Md.) and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
A beam port has been installed at the National Bureau of Standards (NBS) reactor by the University of Maryland group in cooperation with the NBS staff in order to initiate studies of a new analytical technique: neutron-capture prompt ..gamma..-ray activation analysis (PGAA). A detection system based on a large, high resolution Ge(Li) detector surrounded by NaI crystal has been developed for measurement of prompt ..gamma.. rays from 80 keV to 11 MeV. With a temporary external beam tube in place, neutron and ..gamma..-ray backgrounds were investigated prior to design and construction of a well-shielded beam tube and massive shielding for the detection system. With the backgrounds suitably low, it has been possible to investigate ..gamma..-ray spectra of a wide range of samples. These spectra are being carefully analyzed to identify species contributing the observed lines. Whenever an element's presence is suspected. Standards of the pure element or simple compounds are irradiated to determine its complete spectrum. This is necessary in order to determine which lines are useful for analytical purposes and which have interferences from other elements. From the results to date, it appears that PGAA will be able to measure the following elements in many types of samples: H, B, C, N, Na, Al, Si, S, Cl, K, Ca, Ti, V, Mn, Fe, Cd, Sm, and Gd. Many other elements will be measurable in certain classes of samples. Furthermore, the list of elements is incomplete, as not all lines have yet been identified in the spectra. The quantitative application of the method is being tested using a wide range of NBS Standard Reference Materials whose elemental compositions are well characterized. Measurements are reported for about fourteen elements in several standards. In general, the agreement with previous measurements is quite good.
Report Numbers:
E 1.99:oro-5173-003
oro-5173-003
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Note:
Published through SciTech Connect.
08/01/1978.
"oro-5173-003"
Gordon, G.E.; Walters, W.B.; Zoller, W.H.
Funding Information:
EY-76-S-05-5173
View MARC record | catkey: 14398144