Far-Field Approximation in the Generalized Geometry Holdup (GGH) Model

Oberer, R. B. ; Gunn, C. A. ; Chiang, L. G.

Oak Ridge Y-12 Plant

关键词: Uranium;    Attenuation;    Approximations;    Calculation Methods;    11 Nuclear Fuel Cycle And Fuel Materials;   

DOI  :  10.2172/900342
RP-ID  :  Y/DK-2176 Rev 1
RP-ID  :  DE-AC05-00OR22800
RP-ID  :  900342

美国|英语

来源: UNT Digital Library

【 摘 要 】

Quantitative gamma spectrometry measurements of uranium frequently require corrections for attenuation by an equipment or container layer and by the uranium bearing material itself. It is common to correct for attenuation using the ''far-field approximation''. Under this approximation, the minimum thickness of equipment or material is used for the correction rather than an average thickness over the detector field-of-view. In reality this aspect of the far-field approximation is really a narrow field-of-view approximation. The price of this simplification is the introduction of a bias. This bias will be investigated in this paper. In addition, there is a distance dependence of the radial response of a detector. This dependence will also be investigated.