CsI(Tl) detector application for low energy mixed radiation field

The CsI(Tl) crystal was used for charge particles registration. Photomultipliers signals were digitized by quad waveform digitizer. The particle energy was estimated with accuracy ∼180 keV. Each signal was described as a sum of three exponential curves using the least squares method. This approach allowed us to create a method for pulses shape identification of the charged particles. In addition to it this method may be used for pull-up rejection. The main luminescence properties (light yield, rise time, decay time) for various particles were investigated. It shows that electrons, protons and the alpha-particles with energy up to 1 MeV can be effectively separated. (authors)