Electron Processes in a Liquid-Xenon Ionization Chamber under Conditions of High-Intensity Pulsed Irradiation

摘要

The results of experimental investigation and simulation of electron processes in a liquid-xenon-filled ionization chamber, which is irradiated with bremsstrahlung-radiation pulses from a synchrotron, are presented. The radiation dose was varied from 10{sup}(-6) to 0.11 Gy/pulse. The response of the chamber to an intense pulsed excitation and the recovery of its serviceability after intense irradiation were studied. It has been shown that, at doses >10{sup}(-4) Gy/pulse, the space charge produced in the chamber has a noticeable effect on the formation of electron-conductivity pulses. The shape of the current pulse in the chamber, inside which a space charge is produced, is studied, the pulse parameters are measured, and a model is proposed with allowance for the effect of the space charge. It has been shown that, at doses exceeding the critical values, the space charge disappears within ~50-100 μs, the durations of the transient processes in the electric circuits being as long as ~500 μs. Hence, the spectrometric characteristics of the ionization chamber are restored ≤1 ms after the irradiation terminates.