Radioactive materials are now part of modern life in industry, research laboratories, nuclear fuel processors, power stations and hospitals. While their benefits are well established, their monitoring and control present special problems. One of these is the difficulty in training staff to detect and control contamination, because in order to achieve this, both trainers and trainees are necessarily exposed to it. This is a clear conflict with generally recognised safety principles, including ALARA. To overcome this, Safe Training Systems have developed a realistic simulation system, the STS 800 series of Ionising Radiation Simulators.