Abstract
Saturation current densities, extrapolated electric fields, and electret-charging and -discharging current-density profiles in an ionization electret chamber are discussed as a function of various chamber parameters, such as air-gap and polymer thickness, polarizing electrode material, exposure rate, etc. Both the saturation current density and the extrapolated electric field consist of two components; one is linear with the air-gap thickness and is attributed to primary ionization in air, and the other exhibits exponential saturation and is attributed to air ionization caused by photoelectrons backscattered into the chamber sensitive volume from the polarizing electrode.
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