Pulse pile-up rejection in Si(Li) X-ray detection systems

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Abstract
Pulse pile-up is significant in Si(Li) X-ray spectra because of the long main amplifier time constants used. It is undesirable because it causes spurious coincidence peaks and increases background. Pile-up rejection, using a fast amplifier to resolve nearly coincident pulses, greatly reduces pile-up effects. At low X-ray energies the choice of time constants in the rejection amplifier becomes critical if X-ray pulses are to be distinguished from noise. The results of experimental investigations of the optimum settings of the rejection system are described.

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