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It is a system for treating radioactive gases to allow for safe separation and storage of the different isotopes. JET operates an active gas handling facility at all times, as it can operate with tritium. The JET Active Gas Handling System was designed, built and commissioned to safely handle radioactive tritium gas mixtures, to supply tritium and deuterium to the JET torus, to process the exhaust gases, to enrich and re-use tritium and deuterium, to detritiate tritiated impurities and to keep discharges far below the approved daily release limits.