A commercial thimble ionization chamber, intended for use as a Bragg-Gray cavity chamber at high photon energies, must be calibrated in such a way that the reading of the instrument can be converted into the 'ion dose' in the air volume of the chamber, i.e. the quotient of the ion charge and the mass of air in that volume. The factor for this conversion is independent of the photon energy. A method for this calibration is proposed and measurements of a correction factor are described. The theoretical expression for the energy dependent conversion factor, in calculating the absorbed dose in water from the reading of the dosemeter when the chamber is used in a water phantom, is compared with calculations of other authors.
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Henriette Franz (1971) studied this question.
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