| Abstract | International dosimetry protocols require measurements made with a vented ionization chamber to be corrected for the influence of air density by using the standard temperature‐pressure correction factor. The effect of humidity, on the other hand, is generally ignored with the provision that the relative humidity (RH) is within certain limits (typically 20% to 80%). However, there is little experimental data in the published literature as to the true effect of humidity on modern reference‐class ionization chambers. This investigation used two different radiation beams – a Co‐60 irradiator and an Sr‐90 check source – to examine the effect of humidity on several Farmer‐type ionization chambers. |
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