Since the introduction of beryllium in 1989, and the tritium campaigns in 1991 and 1997, the issue of controlling the spread of contamination and the protection of the workforce has had an increasing impact on operational tasks at JET. When considering engineering controls for the protection of the workforce the following hierarchy generally applies:- 1. containment- to provide a continuous barrier between the contaminant and the workplace 2. confinement- the use of ventilation systems and the directed flow of air to capture and contain the contaminant 3. respiratory protection- the provision of personal protective equipment to protect the individual worker from a noxious environment