[en] A series of experiments was conducted to evaluate the efficiency of an Emergency Containment System (ECS) to capture tritium before it reaches the biosphere. The ECS is an automatically actuated room air detritiation system. Parameters such as hydrogen abundance and catalysis operating temperature were varied to determine the impact on capture efficiency. Data on tritium oxide buildup and deposition on laboratory surfaces were also collected. Experimental results were evaluated utilizing the mathematical model originally developed for design criteria to determine whether the system operated as predicted. These experiments showed that the ECS is capable of removing tritium at levels that approach natural abundance hydrogen concentration