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Uranium which accumulates in process equipment and associated plumbing, ductwork, and filters is measured at Y-12 with portable NaI detectors using the Generalized Geometry Holdup (GGH) model. In this model all accumulations are modeled as points, lines, and areas. The width of point and line sources is also considered to account for detector response and the effects of self attenuation. The measurements are not precise but in theory the uncertainty will be reduced by a large number of unbiased measurements. However, the simplifications in the GGH model of real geometries result in measurement biases which violate this assumption. These biases need to be understood and corrected when they are significant. This paper reviews many of the biases inherent in the GGH model.

Inherent Negative Biases in the Generalized Geometry Holdup (GGH) Model