Publications
Showing 39 results for Author: Tamara {Tammy} J. Keever
Sep, 2026
Journal
Expanded method for the determination of burnup in nuclear fuels using multiple neodymium isotopes
Established methods for the determination of burnup in nuclear fuels commonly rely on the measurement of 148Nd in the spent fuel in concert with known fission product yields to determine the atom percent of fissions in the fuel. This isotope of neodymium is used for various reasons, including chemical and radioactive stability, ease of measurement, and low rates of formati…
Aug, 2026
Journal
Accelerating actinium-225 purification by high-pressure ion chromatography
Actinium-225 (t1/2 = 9.92 days) is an important radioisotope for targeted alpha therapy applications. The limited supply obtained through the decay of thorium-229 has motivated accelerator-based production routes, including irradiation of thorium targets. Irradiated targets can produce useful quantities of actinium-225, but the product requires final purification from chem…
Aug, 2026
ORNL Report
Update on Radiochemical Assessment of High Burnup Commercially Irradiated Fuel
Feb, 2026
Journal
Understanding the structural and morphological effects of synthesis route on NpO2
The availability of actinide standard materials for use in nuclear safeguard applications is critical, as is thorough characterization thereof. Although accurate trace element compositions and isotopic considerations are paramount for deployment of reference standards, structural characterization is also essential towards accurately describing the chemical form and potenti…
Jan, 2026
Journal
Recovering High-Purity Uranyl Nitrate from Simulated Used Nuclear Fuel Dissolver Solutions by Crystallization: Rejecting Technetium
The separation of U from Tc and other problematic fission product elements like Mo and Ru, along with Sr, Zr, Cs, and Nd, has been achieved via the crystallization of uranyl nitrate hexahydrate (UNH). Rejection of technetium as pertechnetate anion (99TcO4–) is an especially important feature of this system, as it otherwise tends to follow U(VI) in extractive separations. I…
May, 2025
Journal
Self-replenishing Ni-rich stainless-steel electrode toward oxygen evolution reaction at ampere-level
In the past few decades, tremendous attention has been devoted to enhancing the activity of oxygen evolution reaction (OER) catalysts for hydrogen production, while the cost and long-term stability of catalysts, which can play an even more important role in industrialization, have been much less emphasized. Herein, we engineered an OER electrode from abundant stainless ste…