OPTIMIZATION OF THE BREMSSTRAHLUNG CONVERTER

Abstract

Variants of the formation of bremsstrahlung (BS) distributions along an extended converter, which ensures the maximum thickness of an object under two-sided and four-sided irradiation, are studied. For the target of the TaH2OFe converter, the thicknesses of the Pb filter were determined, at which the average BS energy increases by more than 25%. In the PENELOPE package, the simulation of dose distributions in polyethylene produced by BS converters with optimal targets: previously used TaH2OFe and proposed by us TaH2OFePb, for 7.5 MeV electron energy, was performed. For four-sided irradiation, a technique for optimizing the distribution of the BS intensity along an extended converter is proposed. The combined use of the TaH2OFePb target and optimal BS intensity distributions along an extended converter makes it possible to increase the thickness of objects by a factor of ~ 1.35 under four-sided irradiation, DUR < 1.5.