7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Efficiency and dead time measurements of the iThemba LABS segmented clover detector

9 Jul 2014, 11:10
D Les 101

D Les 101

Oral Presentation Track B - Nuclear, Particle and Radiation Physics NPRP


Mr Jayson Lee Easton (iThemba LABS)

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

The iThemba LABS segmented clover detector is a new generation high purity germanium detector. The detector has four crystals and each crystal has eight electrical contacts on the outside and a central core contact. This detector can be used either as a standard clover detector or in a gamma-ray tracking mode. To develop gamma-ray tracking, the characteristics of the detector need to be measured. As part of the testing of the detector the depletion voltages, energy resolutions, preamplifier rise and decay times and efficiencies were initially measured using Pixie-4 digital electronics. Pixie-4 parameters were optimised for the best energy resolution of the detector. Although it was expected that the dead time with the digital data acquisition system should be small, we did measure it in order to quantify individually the impact on the efficiency by the dead time and by the coincidence summing. The dead time associated with the Pixe-4 digital electronic was measured with a pulse generator. A dead time of about 20 % at a counting rate of 4 kHz per channel was found. The effects of coincidence summing as a function of distance could then be identified. Similar measurements, performed with Pixie-16 digital electronics and using different shaping parameters are in progress. All these results will be presented and discussed.

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Main supervisor (name and email)<br>and his / her institution

Dr Elena Lawrie, elena@tlabs.ac.za,iThemba LABS, PO Box 722, 7129 Somerset West, South Africa

Primary author

Mr Jayson Lee Easton (iThemba LABS)


Dr Elena Lawrie (iThemba LABS) Dr OBED SHIRINDA (iThemba LABS) Mr Sive Noncolela (UWC) Dr Thifhelimbilu Daphney Bucher (iThemba LABS)

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