Virtual point detector: On the interpolation and extrapolation of scintillation detectors counting efficiencies

Oren Presler, Uzi German, Vitaly Pushkarsky, Zeev B. Alfassi

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The concept of transforming the detector volume to a virtual point detector, in order to facilitate efficiency evaluations for different source locations, was proposed in the past for HPGe and Ge(Li) detectors. The validity of this model for NaI(Tl) and BGO scintillation detectors was studied in the present work. It was found that for both scintillation detectors, the point detector model does not seem to fit too well to the experimental data, for the whole range of source-to-detector distances; however, for source-to-detector cap distances larger than 4 cm, the accuracy was found to be high. A two-parameter polynomial expression describing the dependence of the normalized count rate versus the source-to-detector distance was fitted to the experimental data. For this fit, the maximum deviations are up to about 12%. These deviations are much smaller than the values obtained by applying the virtual point concept, even for distances greater than 4 cm, thus the polynomial fitting is to be preferred for scintillation detectors.

Original languageEnglish
Pages (from-to)704-710
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2
StatePublished - 15 Sep 2006


  • Detector efficiency
  • Point detector concept
  • Scintillation detector

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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