Zero-current and Polarity-effect of ionization chambers have been studied experimentally. The former turns out to be mainly from the contact potential difference between two electrodes. While, as for the latter, it was found that the zero-current of the output electrical connector of ionization chamber makes it most dominantly at ordinarily condition, and when it comes to lower pressure (<∼1mmHg) Taylor-Greening Effect becomes effective.
An effective range is introduced to understand the characteristics of ionization current at the “recombination region”.
