Abstract
A systematic imperfection of charged particle beam dosimetry performed with cavity ionization chambers according to the Bragg-Gray principle is theoretically evaluated. Due to differences in multiple scattering of the particles in the gas-filled cavity and in the solid or liquid medium replaced by the gas, the particle fluence in the gas exceeds the undisturbed fluence existing in the absence of the cavity. For cylindrical cavities with their axes parallel to the beam, three separable mechanisms contributing to this disturbance are evaluated by application of multiple scattering theory. The range of validity of the calculations is extended over that of a previous study, and a revised “perturbation correction factor” is derived. The accuracy of the results is confirmed by comparison with Monte Carlo calculations for 10 MeV electrons in carbon.
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