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A shaping device for irregular electron fields for the Therac‐20 accelerator
Author(s) -
MullerRunkel R.,
Ovadia J.,
Borger F.,
Culbert H.,
Rohowsky B.
Publication year - 1985
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595741
Subject(s) - electron , attenuation , linear particle accelerator , particle accelerator , physics , field (mathematics) , field size , optics , cathode ray , materials science , beam (structure) , nuclear physics , mathematics , pure mathematics
A device for shaping electron fields from a Therac‐20 accelerator is described. The considerable advantage of continuously variable field sizes is enhanced when the shaping device is placed on the lower trimmer bars of the shorter set of electron trimmers, which remain fully adjustable. Cerrobend blocks of 1‐cm thickness are sufficient for a 5% attenuation level with 20‐MeV electrons and large field sizes.