The effects of humidity on volume recombination in ionization chambers.
Saturation curves were measured with a parallel-plate ionization chamber for air with humidities of 0%-81%. From the curves, values of m--which is equal to (alpha/eK+ K-)1/2 where alpha is the recombination coefficient, e the charge of an ion, and K+ and K- are mobilities of positive and negative ions, respectively-were obtained. It was confirmed that humidity was the decisive cause of the increase in the value of m with the lifetime of ions in the ionization chamber. It was found that the value of m increases sharply in a range of small values of the product of the ion lifetime and the partial pressure of water vapour and increases more slowly at high values of this parameter.
Takata
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Electrotechnical Laboratory, 1-1-4, Umezono, Tsukuba-shi, Ibaraki, 305 Japan.
D016477:Artifacts; D003198:Computer Simulation; D019544:Equipment Failure Analysis / Q000379:methods*; D006813:Humidity; D008962:Models, Theoretical; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity