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Updated: Aug 14, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
Published on: May 9, 2014
Variations in response to radiation of a nylon-walled ionization chamber induced by humidity changes
Abstract:
The volume of nylon-walled ionization chambers varies with relative air humidity due to the hygroscopic properties of nylon. A 6% increase in exposure calibration factor of a commonly employed 0.6 cm3 nylon-walled ionization chamber was observed when the relative air humidity decreased from 98% to 11%. The increase as well as the decrease in volume shows an initial fast change during the first day followed by an exponential change with half-lives of about 1.2 days and 2.4 days, for water uptake and water loss, respectively.
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