Spatial resolution attainable in germanium detectors by pulse shape analysis

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There are several applications for which it is desirable to calculate the locations and energies of individual gamma-ray interactions within a high purity germanium (HPGe) detector. These include gamma-ray imaging and Compton suppression. With a segmented detector this can be accomplished by analyzing the pulse shapes of the signals from the various segments. We examine the fundamental limits to the spatial resolution attainable with this approach. The primary source of error is the series noise of the field effect transistors (FETs) at the inputs of the charge amplifiers. We show how to calculate the noise spectral density at the output ... continued below

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19 p.

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Blair, J., Bechtel, NV; Beckedahl, D.; Kammeraad, J. & Schmid, G., LLNL May 1, 1998.

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Description

There are several applications for which it is desirable to calculate the locations and energies of individual gamma-ray interactions within a high purity germanium (HPGe) detector. These include gamma-ray imaging and Compton suppression. With a segmented detector this can be accomplished by analyzing the pulse shapes of the signals from the various segments. We examine the fundamental limits to the spatial resolution attainable with this approach. The primary source of error is the series noise of the field effect transistors (FETs) at the inputs of the charge amplifiers. We show how to calculate the noise spectral density at the output of the charge amplifiers due to an optimally selected FET. This calculation is based only on the detector capacitance and a noise constant for the FET technology. We show how to use this spectral density to calculate the uncertainties in parameters, such as interaction locations and energies, that are derived from pulse shape analysis using maximum likelihood estimation (MLE) applied to filtered and digitized recordings of the charge signals. Example calculations are given to illustrate our approach. Experimental results are given that demonstrate that one can construct complete systems, from detector through data analysis, that come near the theoretical limits.

Physical Description

19 p.

Notes

OSTI as DE98058639

Other: FDE: PDF; PL:

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  • 9. symposium on radiation measurements and applications, Ann Arbor, MI (United States), 11-14 May 1998

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  • Other: DE98058639
  • Report No.: UCRL-JC--129137
  • Report No.: CONF-980545--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 290586
  • Archival Resource Key: ark:/67531/metadc676046

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  • May 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • April 10, 2017, 2:32 p.m.

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Blair, J., Bechtel, NV; Beckedahl, D.; Kammeraad, J. & Schmid, G., LLNL. Spatial resolution attainable in germanium detectors by pulse shape analysis, article, May 1, 1998; California. (digital.library.unt.edu/ark:/67531/metadc676046/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.