A tracer gas system to evaluate the efficiency of ventilation systems or simulate the consequences of an accident.

The tracer technique can be used in ventilation and contaminant spreading investigations. We have chosen sulphur hexafluoride. We have constructed aspecific instrumentation to perform indoor tests. All components are portable and battery operable. We use generators with remotely controlled flow, real-time chromatographs as analysers, continuous SF6 monitors and field-use calibrators. We have performed numerous tests, in the nuclear industry (Laboratories, reprocessing facilities and PWR), in conventional industries and in hospitals. The goal was to consider hygiene problems as well as the improvement of an industrial process.