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Title: NaI(Tl) Scintillator's Response Functions for Point-like and Distributed Gamma-ray Sources
Authors: Carrillo, H. R. Vega
Rengifo, J. L. Benites
Davila, V.M. Hernandez
Rodriguez, J.M. Ortiz
Martínez, H. A. de Leon-
Keywords: Gamma- ray
Point-like source
Distributed source
NaI(Tl) response
Monte Carlo
Issue Date: 8-Aug-2016
Publisher: Chitkara University Publications
Abstract: The response functions of a NaI(Tl) detectors have been estimated using Monte Carlo methods. Response functions were calculated for monoenergetic photon sources (0.05 to 3 MeV). Responses were calculated for point-like sources and for sources distributed in Portland cement cylinders. Calculated responses were used to estimate the detector efficiency for pointlike and distributed sources. Samples of cylindrical Portland cement were prepared and exposed to the photoneutron field produced by a 15 MV linac used for radiotherapy. Short half-life radioisotopes were induced and the activity was determined by measuring the pulse-height spectra with a NaI(Tl) g-ray spectrometer that was calibrated using point-like sources. Instead of doing corrections due to differences between the geometry, material and solid angle of point-like sources used for calibration, and the Portland cement cylinders, the detection efficiency was determined using the ratio between the efficiencies for the point-like and the distributed sources estimated with the Monte Carlo calculations, and the activity of the induced isotopes in cement was obtained.
ISSN: Print - 2321-8649
Online 2321-9289
Appears in Collections:JNP Volume 4 Number 1 (August - 2016)

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