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Latest News
EPA issues final rule regulating “forever chemicals”
The Environmental Protection Agency announced that it will issue a rule aimed at limiting public exposure to per- and polyfluoroalkyl substances (PFAS). The final rule will designate two widely used PFAS chemicals, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), as hazardous substances under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), also known as Superfund.
According to the EPA, both PFOA and PFOS meet the statutory criteria for designation as hazardous substances.
T. Kawasaki, Y. Manabe, K. Katayama, T. Takeishi, M. Nishikawa
Fusion Science and Technology | Volume 48 | Number 1 | July-August 2005 | Pages 581-584
Technical Paper | Tritium Science and Technology - Materials Interaction and Permeation | doi.org/10.13182/FST05-A992
Articles are hosted by Taylor and Francis Online.
Tungsten is a candidate material for plasma facing components for a fusion reactor. Although many studies on hydrogen behavior in tungsten have been carried out, there is insufficient database for a tungsten re-deposition layer. We have made a tungsten re-deposition layer by a sputtering method using a hydrogen and deuterium RF plasma and have investigated hydrogen retention in the layer and the distribution of the layer in the vacuum chamber. The amount of deposited tungsten increased 2.4 times with varying RF power from 100 W to 250 W. It was found from the SEM observation on the cross section that the formed layer has a columnar structure. At high energy (RF power: 250W), a lot of blisters were observed on the surface. The ratio of hydrogen atoms to tungsten atoms (H/W) in the layer was observed to be 0.1 ~ 0.4 with varying RF power. These values of hydrogen retention were much larger than that for absorption into tungsten. Tritium inventory in a D-T fusion reactor may become larger than expected by the formation of tungsten redeposition layer.