By Topic

Experimental and Monte Carlo investigation of intrinsic limits of scintillator energy resolution

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

7 Author(s)

While non-proportionality is assumed to degrade scintillator energy resolution, the quantitative relationship between non-proportionality and energy resolution is not well understood. We report on the results of experimental data analysis and Monte Carlo simulation used jointly to study the relationship between scintillator electron response non-proportionality and gamma ray energy resolution. Energy resolution for Compton interactions was compared to energy resolution for photoelectric interactions, to investigate the hypothesis that non-proportionality affects these two types of interactions differently. The difference is thought to be due to low energy quanta such as Auger electrons and fluorescent x-rays produced by photoelectric interactions (which predominantly interact with inner shell electrons) but not by Compton interactions (which predominantly interact with valence electrons). A newly constructed Compton coincidence apparatus (SLYNCI) was used to measure electron response non- proportionality in Nal(Tl) that was excited by Compton-scattered electrons. Measured values for both light output vs. electron energy and energy resolution vs. electron energy were then used to predict gamma ray energy resolution, based on Monte Carlo simulations that mimicked the distribution of energetic electrons emitted following photoelectric absorption of gamma rays in the scintillator. Predicted values were compared to experimental data obtained by exciting the scintillator with isotopic sources. In this manner, the component of gamma ray energy resolution degradation due to non-proportionality was determined, as well as the electron energy resolution component due to electron response counting statistics and other possible limiting factors such as Landau fluctuations in the dE/dx along the electron track.

Published in:

Nuclear Science Symposium Conference Record, 2007. NSS '07. IEEE  (Volume:2 )

Date of Conference:

Oct. 26 2007-Nov. 3 2007