Impact of oxidation and carbonation on the release rates of iodine, selenium, technetium, and nitrogen from a cementitious waste form.

Recent advances toward structural incorporation for stabilizing heavy metal contaminants: A critical review

99Technetium (99Tc) is a hazardous radionuclide that poses a serious environmental threat. The wide variation and complex chemistries of liquid nuclear waste streams containing 99Tc often create unique, site specific challenges when sequestering and immobilizing the waste in a matrix suitable for long-term storage and disposal. Therefore, an effective management plan for 99Tc containing liquid radioactive wastes (such as storage (tanks) and decommissioned wastes) will likely require a variety of suitable materials/matrixes capable of adapting to and addressing these challenges. In this review, we discuss and highlight the key developments for effective removal and immobilization of 99Tc liquid waste in inorganic waste forms. Specifically, we review the synthesis, characterization, and application of materials for the targeted removal of 99Tc from (simulated) waste solutions under various experimental conditions. These materials include (i) layered double hydroxides (LDHs), (ii) metal-organic frameworks (MOFs), (iii) ion-exchange resins (IERs) as well as cationic organic polymers (COPs), (iv) surface modified natural clay materials (SMCMs), and (v) graphene-based materials (GBMs). Second, we discuss some of the major and recent developments toward 99Tc immobilization in (i) glass, (ii) cement, and (iii) iron mineral waste forms. Finally, we present future challenges that need to be addressed for the design, synthesis, and selection of suitable matrixes for the efficient sequestration and immobilization of 99Tc from targeted wastes. The purpose of this review is to inspire research on the design and application of various suitable materials/matrixes for selective removal of 99Tc present globally in different radioactive wastes and its immobilization in stable/durable waste forms.

Design and Application of Materials for Sequestration and Immobilization of 99Tc.

The role of UC inclusions in the development of fission gas bubble superlattice neutron-irradiated monolithic U-10Mo fuels

http://manuscript.elsevier.com/S0304389422002953/pdf/S0304389422002953.pdf

The evolution of hydrated lime-based cementitious waste forms during leach testing leading to enhanced technetium retention.

Delayed Onset of Discontinuous Precipitation-Based Phase Transformation in U-10mo Alloys Doped with Silicon

A novel approach for a single step lapping and chemical-mechanical polishing of antimonide-based III-V compounds using agglomerate-free alumina slurries is presented. Relatively high removal rates, minimal scratching, and low surface roughness have been obtained. The effects of slurry preparation cycle on the slurry properties and chemomechanical polishing results are discussed.

https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S1946427400583742

L. Sweet

Papers

The evolution of hydrated lime-based cementitious waste forms during leach testing leading to enhanced technetium retention.

Delayed Onset of Discontinuous Precipitation-Based Phase Transformation in U-10mo Alloys Doped with Silicon

A Novel Single Step Lapping and Chemo-Mechanical Polishing Scheme for Antimonide Based Semiconductors Using 1 µm Agglomerate-Free Alumina Slurry