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Clinic based transfer of the N D , w C 60 o calibration coefficient using a linear accelerator
Author(s) -
AbdelRahman W.,
Evans M. D. C.,
Serré L.,
McCaffrey J. P.,
Podgorsak E. B.,
Seuntjens J. P.
Publication year - 2009
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 - 10.1118/1.3075822
Subject(s) - ionization chamber , dosimetry , calibration , linear particle accelerator , primary standard , ionization , absorbed dose , medical physics , physics , beam (structure) , materials science , optics , nuclear medicine , nuclear engineering , medicine , engineering , ion , quantum mechanics
Ionization chambers used for reference dosimetry require a local secondary standard ionization chamber with aC60 o absorbed dose to water calibration coefficientN D , wC60 otraceable to a national primary standards dosimetry laboratory or an accredited secondary dosimetry calibration laboratory. Clinic based (in‐house) transfer of this coefficient to tertiary reference ionization chambers has traditionally been accomplished with chamber cross calibration in water using aC60 o beam; however, access toC60 o teletherapy machines has become increasingly limited for clinic based physicists. In this work, the accuracy of alternative methods of transferring theN D , wC60 ocalibration coefficient using 6 and 18 MV photon beams from a linear accelerator in lieu ofC60 o has been investigated for five different setups and four commonly used chamber types.