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Secondary radiation from supervoltage accelerators-its implications in patient protection.

If the collimator and compensator of a supervoltage accelerator are made of high atomic number material they will tend to interact with the high energy photon beam predominantly by pair-production. Associated with pair-production is a cascade formation resulting in a variety of radiations, i.e. pair-electrons, annihilation radiation, brems-strahlung, Compton scattered photons and recoil electrons.