Sorption and Desorption of Tritiated Water on Paints
Fusion Science and Technology / Volume 21 / Number 2P2 / March 1992 / Pages 827-832
Material; Storage and Processing / dx.doi.org/10.13182/FST92-A29851
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The sorption and desorption of tritiated water on paints , such as acryl, silicone, epoxy and fluorine types, has been studied. In dynamic adsorption and desorption experiments, tritium concentration in the chamber, in which painted metal was installed, was measured during HTO vapor charging or purging by N2+H2O. Slow desorption rate for acryl type was observed. Residual tritium not released by sweeping with N2+H2O was recovered by heating up to 800°C. Residual tritium fraction for epoxy type was found to be highest among tested. Paint membrane was used in permeation experiments of HTO vapor and liquid. Diffusivity, solubility and permeability were evaluated. Diffusivity for fluorine was largest and that for epoxy smallest. Epoxy is considered to be the most suitable paint because of its low permeability.
