High-Purity Germanium Spectroscopy at Rates in Excess of $10^{6}$
| Autor: | Douglas C. Rodriguez, Matthew S. Taubman, Christopher D. Wilen, Michael E. Wright, Lynn Wood, B. A. VanDevender, Michael P. Dion, James E. Fast |
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| Rok vydání: | 2014 |
| Předmět: |
Physics
Nuclear and High Energy Physics Spectrometer business.industry Preamplifier Detector Electrical engineering Semiconductor detector Optics Nuclear Energy and Engineering Nuclear electronics Gamma spectroscopy Electrical and Electronic Engineering business Throughput (business) Energy (signal processing) |
| Zdroj: | IEEE Transactions on Nuclear Science. 61:2619-2627 |
| ISSN: | 1558-1578 0018-9499 |
| Popis: | In gamma spectroscopy, a compromise must be made between energy resolution and event-rate capability. Some foreseen nuclear material safeguards applications require a spectrometer with energy resolution typical of high purity germanium (HPGe) detectors, operated at event rates up to and exceeding ${10^6}$ per second. We report the performance of an HPGe spectrometer system adapted to run under such conditions. Our system consists of a commercial semi-coaxial HPGe detector, a modified high-voltage-rail, resistive-feedback, charge-sensitive preamplifier and a continuous waveform digitizer. Digitized waveforms are analyzed offline with a novel time-variant trapezoidal filter algorithm. Several time-invariant trapezoidal filters are run in parallel and the slowest one not rejected by instantaneous pileup conditions is used to measure each pulse height. We have attained full-width-at-half-maximum energy resolution approximately 8 keV measured at 662 keV with $1.03 \times {10^6}$ per second incoming event rate and 39% throughput. An additional constraint on the width of the fast trigger filter removes a significant amount of rising edge pileup that passes the first pileup cut, reducing throughput to 25%. While better resolution has been reported by other authors, our throughput is an order of magnitude higher than any other reported HPGe system operated at such an event rate. |
| Databáze: | OpenAIRE |
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