Achieving Higher Accuracy in the Gamma-Ray Spectrocopic Assay of Holdup

In-Situ Measurements of Low Enrichment Uranium Holdup Process Gas Piping at K-25 - Paper for Waste Management Symposia 2010 East Tennessee Technology Park Oak Ridge, Tennessee

“…The relative counting uncertainty for an area measurement of a pipe is given below. For other geometries the background correction factor will need to be changed to the appropriate quantity [Russo, et. al.…”

“…{(P'feasw.ed } = R (mA) (Pfeos,tred ( Equation 16)0 R (mA) = the relative uncertainty in the specific mass, m 4 R (mA) = C,relative = the relative error propagated from counting statistics Equation 12The screening condition can be written as: 17)This screening condition essentially moves the threshold from its theoretical limit by a factor of kcr to account for uncertainty (typically, k=3 [Russo, et. al.…”

“…Furthermore, it is assumed that the width of the region of interest (ROl) for the analysis peak (R014) and the Compton region (R015) are the same. For more detailed explanations of HMS4 consult the references [Russo, et. al.…”

The Self Attenuation Correction for Holdup Measurements, a Historical Perspective

“…[6] Recently Equation (11) was solved for the corrected density thickness which resolved the first problem with the equation. [7] However, the measured density thickness was not converted from the density thickness of 235 U to the density thickness of the entire mixture, leaving the second problem unresolved. 1 …”

Improved Background Corrections for Uranium Holdup Measurements

“…Two improvements [4] were recently made to the GGH model and are currently in use at the Y-12 National Security Complex. These two improvements are the finite-source correction CF g and the self-attenuation correction.…”