Discrimination capability of avalanche counters detecting different ionizing particles |
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Authors: | G Prete G Viesti |
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Affiliation: | 1. Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro Padova, Italy;2. Dipartimento di Fisica dell''Universita''di Padova, Padova, Italy |
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Abstract: | The discrimination capability of avalanche counters to detect different ionizing particles has been studied using a 252Cf source. Pulse height, pulse-height resolution and timing properties have been measured as a function of the reduced applied voltage for parallel-plate and parallel-grid avalanche counters. At the highest applied voltages, space charge effects shift the pulse-height signal of the avalanche counter away from being linearly proportional to the stopping power of the detected particles and cause the pulse-height resolution to deteriorate. To optimize the avalanche counter capability, without loss of time resolution, it appears better to operate the detector at voltages well below the breakdown threshold. Measurements with 32S ions are also reported. |
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