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A proposal for the calibration of plane‐parallel ion chambers by accredited dosimetry calibration laboratories
Author(s) -
Attix F. H.
Publication year - 1990
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 - 10.1118/1.596451
Subject(s) - dosimetry , ionization chamber , calibration , imaging phantom , optics , medical physics , physics , ionization , materials science , nuclear medicine , ion , medicine , quantum mechanics
A procedure is described by which the AAPM‐accredited dosimetry calibration laboratories could offer calibrations of plane‐parallel ionization chambers for radiotherapy dosimetry applications, by comparison with a cylindrical ion chamber in a phantom irradiated by 6 0 Co γ rays. N gas can thus be determined for the plane‐parallel chamber under uniform conditions of photon scatter, and without the need for an electron fluence correction.