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June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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Fusion Science and Technology
Latest News
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.
A. Nikroo, D.A. Steinman
Fusion Science and Technology | Volume 35 | Number 2 | March 1999 | Pages 212-215
Technical Paper | doi.org/10.13182/FST99-A11963925
Articles are hosted by Taylor and Francis Online.
We have successfully sputter coated sub-micron layers of quartz onto plasma polymer shells. An agitation mechanism based on an electromagnetic shaker was used. Coatings as thin as 0.4 μm that retain their integrity have been deposited. These coatings have permeation rates against helium at room temperature that are similar to those of thermal quartz. However, the permeation rates to D2 and argon of coatings thinner than ≈ 2 μm are higher than expected. In contrast, coatings thicker than 2 μm had D2 half-lives that were long enough to make them useful as a permeation barrier. Diffusion along grain boundaries or through pinholes is a likely reason for the high permeation rates through the thinner coatings. Because plasma polymer becomes thermally unstable near 300°C, these composite shells have to be filled at a maximum temperature of 250°C.