Authors:W. Andrews, E. Waller, P. Brousseau, G. Roy, X. Cao, K. Creber, and L. Erhardt
During the past decade, interest has increased in qualifying and quantifying the threat posed to the public by the illegal
use of radionuclides. In order to take investigations beyond the laboratory bench into more realistic scenarios, environmental
and safety considerations dictate that these studies be performed on stable and benign surrogates. This paper discusses some
of these studies, specifically the use of cerium dioxide for actinide ceramics and calcium and natural strontium ceramics
for those based on 90Sr.
Authors:Weijia Li, R. Skinner, K. Megna, Jing Chen, S. Perera, J. Murimboh, E. Waller, L. Erhardt, and R. Cornett
Inhalation is one of the most important routes for aerosol particles of uranium compounds to enter the body. The main step
for uranium to be available for blood circulation and for interaction with bio-molecules is the dissolution of the particles.
Particle size effects on dissolution of uranium dioxide and uranium ore were studied in simulated lung fluid using the “batch/filter”
method. Samples were fractionated to ten size ranges from <0.43 μm to >10 μm by cascade impaction prior to dissolution experiments.
Dependence of dissolution kinetics on particle size and on the amount of uranium trioxide contained in the particles was observed.