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The optimization and validation of a procedure for the determination of tritium from gaseous effluents from a nuclear power plant is described. Optimization included performance assessment of silica gel and a molecular sieve as a material for the adsorption of water moisture from air for continuous tritium sampling. In addition, the usability of such a system for monitoring tritium in laboratory air for low-level tritium measurements was assessed. The molecular sieve showed better performance, with an average desorption efficiency of 95% compared to 78% achieved with silica gel. The memory effect was also lower and more reproducible for the molecular sieve, amounting to 7% on average compared to 35% attained for silica gel. Measurement of low-level tritium in air showed the importance of prior checks of intrinsic tritium levels in the molecular sieve as due to that erroneous results could be produced.

Optimization and validation of a procedure for the determination of tritium in gaseous effluents from nuclear power plants