Medical linear particle accelerators, developed since the 1940s, began replacing x-ray and cobalt units in the 1980s and these older therapies are now declining.
Os aceleradores de partículas lineais médicos, desenvolvidos desde a década de 1940, empezaron a substituír as unidades de raios X e cobalto na década de 1980 e estas terapias vellas están agora en declive.