A time dependent solution for the operation of ion chambers in a high   ionization background
  We have derived a time dependent solution describing the development of space charge inside an ion chamber subjected to an externally caused ionization rate N. The solution enables the derivation of a formula that the operational parameters of the chamber must satisfy for saturation free operation. This formula contains a correction factor to account for the finite duration of the ionization rate N. 
Christos Velissaris (University of Wisconsin)