A computational modelling of low-energy gamma ray detection efficiency of a cylindrical NaI(Tl) detector


Ahmadi S., Ashrafi S., Yazdansetad F., Roshanshah N., Tarim U. A. , Gurler O.

RADIATION PHYSICS AND CHEMISTRY, vol.188, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 188
  • Publication Date: 2021
  • Doi Number: 10.1016/j.radphyschem.2021.109581
  • Journal Name: RADIATION PHYSICS AND CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, EMBASE, INSPEC, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Keywords: Na(Tl) detector, Low-energy gamma ray, Detection efficiency, Computational modelling, SCINTILLATORS
  • Bursa Uludag University Affiliated: Yes

Abstract

Measurements show the detection efficiency of the NaI(Tl) detector depends on the source-detector configuration. In this work, the geometrical and intrinsic detection efficiencies of the 2in both in height and diameter and 3in both in height and diameter cylindrical NaI(Tl) detectors have been calculated for low-energy gamma ray. In these calculations, the effects of cover layers of NaI(Tl) (aluminum housing and reflector) have been taken into consideration. To evaluate the calculation model, the detection efficiency of the detector is measured and modelled using MCNP simulation tool. Isotropic 241Am was used as a point source. Results show the calculation model is in good agreement with the experiment and Monte Carlo simulation.