Unitary self shielded, self filtered and flattened Bremsstrahlung photon source assembly for radiotherapy use

摘要

A photon source filter and primary collimator arrangement wherein the source and filter are within the boundaries of the primary collimator and together form a unitary assembly which may be fixed relative to the impinging electron beam or may be removable from the same. The assembly may consist of low and high atomic number elements or compounds.