Advanced Process Monitoring Safeguards Technologies at Pacific Northwest National Laboratory

The Multi-Isotope Process (MIP) Monitor Project: FY12 Progress and Accomplishments

“…Early FY12 efforts focused on analyzing this data. The results of this data analysis were presented at the March MPACT Working Group meeting and at ATALANTE 2012 (Schwantes et al 2012); the results are summarized here.…”

Multivariate Analysis To Quantify Species in the Presence of Direct Interferents: Micro-Raman Analysis of HNO3 in Microfluidic Devices

“…HNO 3 is a key component in a variety of laboratory and industrial scale solution systems, and knowledge of HNO 3 concentration is, in some cases, vital to system performance. An example of this can be seen in the reprocessing of used nuclear fuel where the plutonium uranium extraction (PUREX) and related separation processes are highly dependent on HNO 3 concentration. − Previously published work demonstrates that Raman spectroscopy can be successfully utilized to measure HNO 3 concentration in solution. ,,− While multivariate analysis was used to quantify HNO 3 in the listed references, solution conditions were relatively simple; overlapping bands, matrix effects, or systematic baseline shifts did not pose a significant difficulty to quantifying species. Chemometric analysis has been applied to spectroscopic monitoring systems exhibiting complex band structures of not fully confounded species. ,,,, In this work, the successful quantification of HNO 3 in the presence of directly interfering species is demonstrated.…”