Summary: 1920 s Linacs were first installed in 1952 in England and at Stanford University Medical Center in 1956 by Varian Review the history of radiation therapy at the RTanswers webpage Linear accelerator showing beam from AAPM The medical linear accelerator outputs a well defined beam of intense x ray radiation to treat deep seated tumors There are four major subsystems
Image Dimensions: 653 x 541
Image originally found here.