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Digital Pulse Timing with Semiconductor Gamma-ray Detectors Using a Wavelet Transform Technique

Nakhostin, Mohammad (2018) Digital Pulse Timing with Semiconductor Gamma-ray Detectors Using a Wavelet Transform Technique Review of Scientific Instruments.

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Obtaining precise timing information from semiconductor gamma-ray detectors is of great interest for a variety of applications such as high-resolution positron emission tomography (PET). However, pulse timing with these detectors through the common constant-fraction discrimination (CFD) method is strongly affected by the time-walk error that results from the inherent variations in the shape of the detectors’ pulses. This paper reports on the use of the wavelet transform for minimizing the time-walk error in digital CFD pulse timing with semiconductor gamma-ray detectors. The details of the method are described and the experimental results with a 1 mm thick CdTe detector are shown. It is demonstrated that, by using the Haar wavelet transform of the digitized preamplifier pulses, the original tailed time spectrum of the detector with a time resolution of 8.22±0.12 ns at full-width at half-maximum (FWHM) in the energy range of 300-550 keV improves to a symmetric time spectrum with a time resolution of 3.39±0.02 ns (FWHM).

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Date : 2018
Funders : STFC
Copyright Disclaimer : Copyright 2018 The Author.
Uncontrolled Keywords : Pulse timing; Semiconductor detectors; Wavelet transform; Time resolution
Depositing User : Melanie Hughes
Date Deposited : 16 Oct 2018 09:59
Last Modified : 11 Dec 2018 11:24

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