Direct Decomposition Processing of Tritiated Methane by Helium RF Plasma

Abstract

With the aim of developing a method for the recovery of tritium from tritium-bearing hydrocarbons, it was shown experimentally that methane can be decomposed directly into hydrogen and carbon in RF plasmas via reactions initiated by electrons. Measurements performed with CH₄ and CH₃T in a helium RF plasma indicate that the degree of decomposition of CH₃T is substantially smaller than that of CH₄. This is considered to be caused by a very low concentration of CH₃T. It was found that a majority of tritium dissociated from CH₃T is retained in the plasma reactor. However, a certain amount of retained tritium could be removed by a discharge-cleaning of oxygen.

Keywords:

• Plasma-induced decomposition
• tritiated hydrocarbon
• helium plasma

Acknowledgments

This work is supported by KAKENHI Grant-in-Aid for Challenging Exploratory Research 23656575.