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Replacement correction factors for electron measurements with a parallel‐plate chamber
Author(s) -
Casson Harvey,
Kiley James P.
Publication year - 1987
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 - 10.1118/1.596073
Subject(s) - dosimetry , ionization chamber , physics , range (aeronautics) , task group , electron , optics , nuclear medicine , nuclear physics , materials science , ion , ionization , medicine , engineering , engineering management , quantum mechanics , composite material
The AAPM Task Group dosimetry protocol is ambiguous regarding the replacement correction factors P repl to be applied to electron measurements with parallel‐plate chambers. By intercomparison with a cylindrical chamber whose P repl values at d max may be calculated from Task Group 21, the P repl values for a PTW/Markus parallel‐plate chamber have been determined in the range of mean incident energies of 5–11 MeV. The P repl values for this chamber are found to differ significantly from unity, if one assumes that the cylindrical chamber values are valid.