Abstract
This paper presents a study for exploring the limiting timing resolution that can be achieved with a large volume 3-D position sensitive CZT detector. The interaction timing information was obtained by fitting the measured cathode waveforms to pre-defined waveform models. We compared the results from using several different waveform models. Timing resolutions, of ∼9.5 ns for 511 keV full-energy events and ∼11.6 ns for all detected events with energy deposition above 250 keV, were achieved with a detailed modeling of the cathode waveform as a function of interaction location and energy deposition. This detailed modeling also allowed us to derive a theoretical lower bound for the error on estimated interaction timing. Both experimental results and theoretical predications matched well, which indicated that the best timing resolution achievable in the 1 cm3 CZT detector tested is ∼10 ns. It is also showed that the correlation between sampled amplitudes in cathode waveforms is an important limiting factor for the achievable timing resolution.
Original language | English (US) |
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Pages (from-to) | 435-445 |
Number of pages | 11 |
Journal | Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
Volume | 550 |
Issue number | 1-2 |
DOIs | |
State | Published - Sep 11 2005 |
Externally published | Yes |
Keywords
- Large volume 3-D position sensitive czt
- Timing resolution
- Waveform analysis
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Instrumentation