A proposal for the calibration of plane‐parallel ion chambers by accredited dosimetry calibration laboratories

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Abstract
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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