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Choosing a therapy electron accelerator target
Author(s) -
Hutcheon R. M.,
Schriber S. O.,
Funk L. W.,
Sherman N. K.
Publication year - 1979
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 - 10.1118/1.594564
Subject(s) - bremsstrahlung , thermoluminescent dosimeter , electromagnetic shielding , electron , dosimeter , atomic number , linear particle accelerator , photon , effective atomic number , dosimetry , atomic physics , materials science , physics , radiation , beam (structure) , optics , nuclear physics , nuclear medicine , medicine , composite material
Angular distributions of photon depth dose produced by 25‐MeV electrons incident on several fully stopping single‐element targets (C, Al, Cu, Mo, Ta, Pb) and two composite layered targets (Ni–Al, W–Al) were studied. Depth‐dose curves were measured using TLD‐700 (thermoluminescent dosimeter) chips embedded in lucite phantoms. Several useful therapy electron accelerator design curves were determined, including relative flattener thickness as a function of target atomic number, “effective” bremsstrahlung endpoint energy or beam “hardness” as a function of target atomic number and photon emission angle, and estimates of shielding thickness as a function of angle required to reduce the radiation outside the treatment cone to required levels.