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Comparison of dose calibration by ionometric and chemical dosimetry for 6‐ and 45‐MV x‐ray beams
Author(s) -
Zwicker R. D.,
Wu Andrew,
Sternick E. S.
Publication year - 1991
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 - 10.1118/1.596599
Subject(s) - dosimetry , ionization chamber , linear particle accelerator , betatron , calibration , nuclear medicine , photon , materials science , dose profile , medical physics , beam (structure) , physics , nuclear physics , optics , ion , ionization , medicine , quantum mechanics
This work reports the results of an experiment carried out to investigate the compatibility of TG‐21 ion chamber calibration with Fricke dosimetry near the extremes of the clinically available megavoltage photon energy range. Doses determined from ion chamber measurements and from chemical dosimetry are compared for a 6‐MV linear accelerator x‐ray beam and 45‐MV betatron beam. The Fricke dosimetry was carried out by the National Institute of Standards and Technology. Agreement within 1% between the two techniques was obtained at both photon energies using a currently accepted G‐value.