Research to determine source efficiences (E[subscript s]) for scrabbled and rough concrete surfaces Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9593tz415

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  • The Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) requires that Final Status Surveys be performed on materials and surfaces that vary in surface smoothness and/or uniformity. To obtain accurate survey data, it may be necessary to adjust detector response for these surface variations. NUREG-1507 refers to such surface efficiency adjustment factors as ε[subscript s], the source efficiency. This parameter is meant to be a detector-independent, yet surface and nuclide-dependent parameter that can be used to adjust observed count rate to provide a true measure of the degree of contamination present. Key measurements in the calculation of (ε[subscript s]) are the energy of the radionuclide contaminant and the average height of the detector above the contaminated surface. During the last year, Oregon State University, Department of Nuclear Engineering and Radiation Health Physics provided technical support for a Final Status Survey of a commercial nuclear plant. OSU NE/RHP has conducted research and experimentation to determine site-specific source efficiency (ε[subscript s]) values for concrete surfaces which had undergone simulated decommissioning activities, such as surface scabbling. Source efficiency (ε[subscript s]) values were determined for seven separate scabbled concrete surfaces which had been prepared using 5 tool types. Fourteen concrete cores were intentionally contaminated with known amounts of two beta emitting radionuclides: ²⁰⁴Tl and ⁹⁹Tc. The ε[subscript s] values were examined as a function of the type of scabbled surface as well as the contaminating nuclide.
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