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Timing in thick silicon detectors for a Compton camera

Timing in thick silicon detectors for a Compton camera

Authors :
Gregor Kramberger
Andrej Studen
Vladimir Cindro
Marko Mikuz
Source :
IEEE Transactions on Nuclear Science. 49:2549-2557
Publication Year :
2002
Publisher :
Institute of Electrical and Electronics Engineers (IEEE), 2002.

Abstract

In the scope of construction of a PET apparatus based on detection of Compton scattering in silicon (Compton camera), the timing properties of 1-mm-thick silicon pad and double-sided microstrip, detectors are studied. Timing in pad detectors is also investigated for 140.5 keV /sup 99m/Tc and 364.5 keV /sup 131/I gamma rays in view of a SPECT application. Compton scattering and energy loss of the Compton electron in the silicon detector are simulated using the GEANT package. The electric field in the detector is calculated numerically for a fully depleted detector in the abrupt junction approximation, taking into account the geometry and varying the reverse voltage. Signal formation is studied using Ramo's theorem and pulse shaping properties of the trigger circuit. A time-walk cut is seen to be directly corresponding to a deposited-energy cut. At 10 keV threshold in 1-mm-thick detectors, 10 ns timing windows are shown to reject a significant portion of events, degrading efficiency or limiting the angular range in a prohibitive way. More involved techniques are therefore suggested, either in the electronics circuit or in later stages of the trigger.

Details

ISSN :
15581578 and 00189499
Volume :
49
Database :
OpenAIRE
Journal :
IEEE Transactions on Nuclear Science
Accession number :
edsair.doi...........dad17295c519e3fe02152d4054bf3221
Full Text :
https://doi.org/10.1109/tns.2002.803884