Abstract: Multi-form tritium sampler uses the principle of catalytic oxidation combined with condensation to sample both oxidized and non-oxidized tritium from air. By establishing experimental methods, values of the sampler′s collection efficiency and catalytic efficiency for calculating sample activity were obtained. This paper mainly introduces the experimental methods for testing the catalytic efficiency and collection efficiency of the multi-form tritium sampler. Two simple experimental setups were constructed to test the collection efficiency and catalytic oxidation efficiency of the sampler. After long-term measurement and calculation of the water content difference between the gases before and after the sampler, it was found that the collection efficiency of the sampler can reach over 98%. Under the set temperature of 400 ℃, the catalytic unit can achieve over 99% oxidation of hydrogen in a standard mixed gas of air and hydrogen.

Key words: sampler, catalytic efficiency, collection efficiency