Title :
Peak-valley analysis of three-quanta positron annihilation: Validity, limitation and optimization
Author :
Chin, M.P.W. ; Alkhorayef, Mohammed ; Spyrou, Nicholas M.
Author_Institution :
CERN (Eur. Organ. for Nucl. Res.), Geneva, Switzerland
fDate :
Oct. 27 2012-Nov. 3 2012
Abstract :
Three-quanta positron annihilation can be a useful chemical probe. 3-γ, yields have so far been inferred from subtle changes in the gamma spectra. Peak-valley analysis, a method for quantifying 3-γ, yields, is susceptible to changes in the gamma spectra due not to three-quanta events but to confounding factors such as photon scatter. Based on FLUKA simulations, this work examines its validity and limitation, and proposes an optimized setup. Findings and discussions will be supported by a selection of annotated sample histories, presented interaction by interaction, from Monte Carlo simulations.
Keywords :
Monte Carlo methods; electron-positron inclusive interactions; gamma-ray spectroscopy; positron annihilation; FLUKA simulation; Monte Carlo simulation; chemical probe; gamma spectra; limitation; optimization; peak valley analysis; three quanta positron annihilation; validity; 3γ positron annihilation; FLUKA; Monte Carlo; gamma spectroscopy; peak-valley method;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4673-2028-3
DOI :
10.1109/NSSMIC.2012.6551276
