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Tritiated Water on Molecular Sieve Without Hydrogen Production

R. Tom Walters, Kevin Sessions, C. Gentile, L. Ciebiera

Fusion Science and Technology / Volume 41 / Number 3P2 / May 2002 / Pages 685-689

Decontamination and Waste / Proceedings of the Sixth International Conference on Tritium Science and Technology Tsukuba, Japan November 12-16, 2001 /

Several molecular sieve beds loaded with tritiated water failed to generate hydrogen gas from tritium self-radiolysis at the expected rate. Preliminary gamma-ray irradiation experiments of 4A molecular sieve with varying amounts of oxygen in the over-gas evoke a quenching mechanism. The data suggest that the gas phase rate constant for the production of hydrogen gas is several orders of magnitude smaller than the third order rate constant for scavenging of radical fragments by oxygen. For the production of hydrogen gas, the rate constant is calculated to be krx = (19.6 ±4.5) sec−1 under oxygen scavenging conditions.

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