Performance of a High-Resolution Digital Positron-Lifetime Spectrometer

F. Bečvář, J. Čížek and I. Procházka Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Praha 8, CZ-180 00, Czech Republic

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Received: 3 09 2007;

This work describes a digital positron-lifetime spectrometer based on two ultrafast digitizers. Performance of the digital spectrometer in conditions of a routine measurement is compared with an analogue setup connected to the same detectors. It was found that engagement of the digital setup leads to an improvement of timing resolution (FWHM for 22Na) from 169 ps for the traditional analogue setup to 146 ps for the digital setup. The coincidence count rate for 1.2 MBq 22Na source is 75-80 coinc./s for both configurations. These results clearly demonstrate the advantages of the digital timing over the traditional analogue setup.

DOI: 10.12693/APhysPolA.113.1279 PACS numbers: 78.70.Bj