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- Title
Measurement and energy correction due to charge carrier lifetimes in large HPGe spectrometers.
- Authors
Kephart, Jeremy D.; Aalseth, C. E.; Miley, H. S.
- Abstract
This work addresses the energy spectrum correction due to increased charge carrier collection times in larger HPGe spectrometers. The energy of the radiation interaction is expected to be proportional to the total collected charge. This is increasingly not true with larger HPGe spectrometers. Some charge is lost as the total charge travels from the interaction location to the collection electrode. This path dependent loss of charge results in decreased energy resolution. In HPGe spectrometers, this process is characterized by the charge carrier lifetime constant and is given as an exponential function of the charge carrier collection time divided by this constant. Thus large detectors can experience exponential decrease in energy resolution as charge carrier collection time increases. We studied the effect of charge carrier lifetime on energy resolution for a p-type point contact HPGe spectrometers using pulse shape analysis. We present a method using the rise time to correct for the charge carrier lifetime on a pulse by pulse basis for a given HPGe spectrometer.
- Subjects
SPECTRUM analysis; ENERGY measurement; SPECTROMETERS; ELECTRODES; EXPONENTIAL functions; GERMANIUM isotopes
- Publication
Journal of Radioanalytical & Nuclear Chemistry, 2009, Vol 282, Issue 3, p897
- ISSN
0236-5731
- Publication type
Article
- DOI
10.1007/s10967-009-0216-2