A Calibration to Predict the Concentrations of Impurities in Plutonium Oxide by Prompt Gamma Analysis Revision 2

Narlesky, Joshua Edward¹  Kelly, Elizabeth J.¹ 

[1] Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

关键词: Instrumentation Related to Nuclear Science & Technology(46);    Mgmt Of Radioactive & Non-radioactive Wastes from Nuclear Facilities(12);    Nuclear Fuel Cycle & Fuel Materials(11);    Nuclear Physics & Radiation Physics(73);    Radiation Chemistry;    Radiochemistry;    & Nuclear Chemistry(38);   

DOI  :  10.2172/1214622
RP-ID  :  LA-UR-15--27057
PID  :  OSTI ID: 1214622

美国|英语

来源: SciTech Connect

【 摘 要 】

This report documents the new PG calibration regression equation. These calibration equations incorporate new data that have become available since revision 1 of ???A Calibration to Predict the Concentrations of Impurities in Plutonium Oxide by Prompt Gamma Analysis??? was issued [3] The calibration equations are based on a weighted least squares (WLS) approach for the regression. The WLS method gives each data point its proper amount of influence over the parameter estimates. This gives two big advantages, more precise parameter estimates and better and more defensible estimates of uncertainties. The WLS approach makes sense both statistically and experimentally because the variances increase with concentration, and there are physical reasons that the higher measurements are less reliable and should be less influential. The new magnesium calibration includes a correction for sodium and separate calibration equation for items with and without chlorine. These additional calibration equations allow for better predictions and smaller uncertainties for sodium in materials with and without chlorine. Chlorine and sodium have separate equations for RICH materials. Again, these equations give better predictions and smaller uncertainties chlorine and sodium for RICH materials.