Chemical Speciation Studies of Radionuclides by XAFS

Chemical Speciation Studies of Radionuclides by XAFS

The local structures of U(V1) oxide precipitates produced as a function of LiOH concentration have been studied by XAFS. Curve-fitting analyses indicate that the solid formed in 0.1 M LiOH is similar to a schoepite-like phase where distinct linear uranyl ions (UO?) are bridged along the equator by OH ions. At higher LiOH concentrations, the uranyl groups become elongated and the precipitate str...

Radionuclides in Chemical Research

Low-Temperature Chemical Kinetic and Speciation Studies of n-Heptane

Although there have been many studies of n-heptane ignition, few studies have provided detailed insights into the low-temperature chemistry of n-heptane—a primary reference fuel— through direct measurements of intermediate species formed during ignition. Such measurements provide understanding of reaction pathways that form toxic air pollutants, greenhouse gas emissions, and particulates such a...

XAFS studies of nickel-doped lead telluride

The problem of impurities and defect states in lead telluride-based semiconductors is of crucial importance for their practical applications. X-ray absorption fine structure (XAFS) techniques are capable to address some of the key issues regarding impurities position, their valent state, as well as the local structural changes of the host lattice in the immediate surrounding of the impurity ato...

NKS-176, Speciation Analysis of Radionuclides in the Environment. NKS-B Speciation project report 2007

This report describes the work carried out under the NUK-B project SPECIATION 2007. In 2007, the project partners had two meeting in April and November, organized a NUK seminar on speciation and hot particles. SPECIATION 2007 t mainly focused on two issues on speciation (1) further development of speciation methods for radionuclides, and (2) investigation of speciation of radionuclides in envir...