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Digital rise-time discrimination of large-area avalanche photodiode signals in X-ray detection

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4 Author(s)
L. M. P. Fernandes ; Dept. de Fisica, Coimbra Univ., Portugal ; P. C. P. S. Simoes ; J. M. F. dos Santos ; R. E. Morgado

The response of a large-area avalanche photodiode to X-rays was investigated by applying pulse-shape discrimination techniques based on rise time. The method employed analog preshaping with time constants of 200 ns followed by digital signal processing in a commercial 125-MHz digitizer. Pulse rise-time discrimination was applied to improve detector energy resolution, background level, and peak distortion. Electronic noise pulses can be efficiently removed at the expense of data-acquisition throughput.

Published in:

IEEE Transactions on Nuclear Science  (Volume:49 ,  Issue: 4 )