Title: Detection Efficiency Calculation for Photons, Electrons and Positrons in a Well Detector - Part I: Analytical Model
Authors: POMME Stefaan
Citation: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SP vol. 604 no. 3 p. 584-591
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2009
JRC Publication N°: JRC48144
ISSN: 0168-9002
URI: http://www.elsevier.com/locate/NIMA
http://publications.jrc.ec.europa.eu/repository/handle/JRC48144
DOI: 10.1016/j.nima.2009.03.076
Type: Articles in Journals
Abstract: An analytical model is presented to calculate the total detection efficiency of a well-type radiation detector for photons, electrons and positrons emitted from a radioactive source at an arbitrary position inside the well. The model is well suited to treat a typical set-up with a point source or cylindrical source and vial inside a NaI well detector, with or without lead shield surrounding it. It allows for fast absolute or relative total efficiency calibrations for a wide variety of geometrical configurations and also provides accurate input for the calculation of coincidence summing effects. Depending on its accuracy, it may even be applied in 4pi-gamma counting, a primary standardisation method for activity. Besides an accurate account of photon interactions, precautions are taken to simulate the special case of 511 keV annihilation quanta and to include realistic approximations for the range of (conversion) electrons and beta- and beta+-particles.
JRC Institute:Institute for Reference Materials and Measurements

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