PULSE-SHAPE ANALYSIS IN THE LIQUID XENON MULTIWIRE IONIZATION-CHAMBERFOR PET

A method of computation of the pulse shape in an ionisation chamber wi th wire collectors has been developed and verified experimentally with a test chamber. Good agreement between the calculated waveforms and t he acquired signals is obtained. Having proved its reliability, the sa me method was applied to study the dependence of the signal pulse shap e and amplitude on the location of primary ionisation due to 511 keV g amma-rays in the liquid xenon multiwire ionisation chamber for PET. A method of real-rime amplitude correction for this effect is suggested, resulting in significant improvement of energy resolution. The simula ted resolution for 511 keV gamma-rays is 15%.