Publications

Jul, 2026

Journal

Quantifying Temperature Dependence of Pu(IV) Absorbance Spectra for Advanced Online Monitoring of Nuclear Processes

This article presents a systematic study of Pu(IV) absorbance spectral features as a function of temperature to develop an understanding of this parameter’s effect on chemometric models that can be used as online monitoring tools to support nuclear processing. The descriptive and predictive models that provide real-time feedback of these processes are usually constructed w…

May, 2026

ORNL Report

Spectrophotometric analysis of P6MX-1 for the Pu-238 Supply Program

Apr, 2026

Journal

Near-Real-Time Material Tracking: Combining Vis–NIR Spectroscopy with Flow Sensing for Accurate Nd(III) Quantification

A fiber-optic visible–near-infrared (vis–NIR) absorption spectroscopy and flow sensor system has been developed for near-real-time tracking of Nd mass in the effluent stream from a column in a fume hood. The approach leverages two unique data streams and a partial least-squares regression (PLSR) model trained on vis–NIR absorption spectra of Nd(III) (0–1.5 M) in 1 M HNO3.…

Apr, 2026

Journal

Demystifying Piecewise and Localized Scatter Correction Methods

Multiplicative scatter is a common source of noise in near-infrared spectroscopy and other related instrumental techniques. A wide variety of methods are commonly used for the correction of multiplicative scatter. However, the majority of such methods assume that the parameters that describe the scatter are constant throughout the measured spectrum, which is often not the…

Dec, 2025

ORNL Report

Progress Establishing Optical Spectroscopy for Neptunium Nuclear Material Control and Accounting Measurements to Support the Plutonium-238 Supply Program

Nov, 2025

ORNL Report

240Pu Spectroelectrochemical Studies to Advance Online Monitoring for the 238Pu Supply Program

Nov, 2025

ORNL Report

Radioisotope Science and Technology Division FY 2025 Core R&D Summary Report: Competitive Projects, Postdoctoral Researchers, and Student Interns

Oct, 2025

Journal

Chemometrics and Visible Diffuse Reflectance Spectroscopy to Classify Plutonium Dioxide

Diffuse reflectance (DR) spectra in the Vis-NIR (∼380–1050 nm) region were acquired for a series of PuO2 samples with a spot size of about 10 × 10 μm. Two batches of six PuO2 samples, synthesized approximately 7.5 months apart, were prepared using both Pu(III) and Pu(IV) oxalate precursors at three distinct calcination temperatures (450, 650, and 950 °C). This yielded a to…