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Updated: May 15, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
Published on: May 9, 2014
Measurements of spatial variations in response of ionization chambers
William E B Miller1, Alan L Kastengren
1Center for Transportation Research, Argonne National Laboratory, Argonne, IL 60439, USA.
Abstract:
Measurements of the spatial variations in the response of three ionization chamber (IC) designs were tested as a function of chamber bias voltage, incident X-ray flux and fill gas. Two components of spatial variation are seen. When the ionization chambers are near saturation, spatial variations exist that are tied to the chamber geometry. While the response of some chambers is relatively flat, others show significant variation across the IC. These variations appear to be inherent in the response of each IC at saturation. When the chamber is far from saturation, large spatial variations in response are present when N(2) is used as a fill gas, but not when ambient air is used as a fill gas. These appear to be tied to space charge effects.
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