[en] Although routine applications of low-energy accelerators are numerous, high energy accelerators (4.5 to 15 MeV) have considerable untapped potential. AECL has developed the high-energy high-power family of IMPELA linacs; also, the accelerator irradiator AECL I-10/1 installed at Whiteshell Laboratories is used for research on applications of radiation, such as crosslinking of plastics, sterilization of animal feeds, and treatment of wastes. Compared to gamma irradiators, accelerators have the obvious advantage that they can be switched off, and generally they are useful where radiation penetration depths of tens of centimetres ar adequate; accelerators can moreover be used to generate bremsstrahlung, but their efficiency in the photon mode is less than in the direct mode