A proposal for the calibration of plane-parallel ion chambers by accredited dosimetry calibration laboratories.
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 60Co gamma rays. Ngas can thus be determined for the plane-parallel chamber under uniform conditions of photon scatter, and without the need for an electron fluence correction.
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F H
FH
Department of Medical Physics, University of Wisconsin Medical School, Madison 53706.
D002138:Calibration / Q000592:standards; D006801:Humans; D007753:Laboratories; D011874:Radiometry / Q000295:instrumentation* / Q000592:standards