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College students help develop waste-measuring device at Hanford
A partnership between Washington River Protection Solutions (WRPS) and Washington State University has resulted in the development of a device to measure radioactive and chemical tank waste at the Hanford Site. WRPS is the contractor at Hanford for the Department of Energy’s Office of Environmental Management.
T. Venhaus, J. Poths
Fusion Science and Technology | Volume 48 | Number 1 | July-August 2005 | Pages 601-604
Technical Paper | Tritium Science and Technology - Materials Interaction and Permeation | doi.org/10.13182/FST05-A997
Articles are hosted by Taylor and Francis Online.
We have hydrided thin (500 nm) films of Er with tritium to a stoichiometry of ErT2, and have been observing their 3He release characteristics at very low 3He/Er ratios. The films are stored in vacuum-tight metal containers and sampled on a timescale ranging from a day to several months. Analysis is performed with very high sensitivity using static noble gas mass spectrometry. For the first several years, 3He release is a fairly constant function of helium generation, and does not depend on the amount of helium accumulated in the film. There appears to be somewhat higher helium release at very early times (up to 2%), decreasing over 6 months to a fairly flat value (0.7%). This observation is consistent with a bubble nucleation and growth mechanism. The very early release behavior does not appear to be dependent upon the presence or growth of surface oxide layers.