Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 484, Issue 1-3, Pages 259-269Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0168-9002(01)01964-7
Keywords
NaI(T1) scintillator; energy resolution; non-proportionality of light output
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The light output for circle divide 10 mm x 10 mm and circle divide 75 mm, x 75 mm NaI(Tl) crystals and energy resolution were measured for gamma-ray energies ranging from 16-1333 keV. These measurements enabled the observation of the light yield nonproportionality behavior and allowed the determination of the intrinsic resolution after correcting for the measured resolution for photomultiplier tube (PMT) statistics, The intrinsic resolution was then compared with the nonproportionality component. The latter was calculated using measured electron response, Monte Carlo N Particle code (MCNP4B), and the simplified cascade sequence for NaI(Tl). This comparison allowed the identification of the intrinsic resolution component associated with delta-rays. Consequently. it was shown that the delta-ray component is the most dominant component of the NaI(Tl) intrinsic resolution. (C) 2002 Elsevier Science B.V. All rights reserved.
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