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

fYear

2012

fDate

Oct. 27 2012-Nov. 3 2012

Firstpage

1101

Lastpage

1105

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE

Conference_Location

Anaheim, CA

ISSN

1082-3654

Print_ISBN

978-1-4673-2028-3

Type

conf

DOI

10.1109/NSSMIC.2012.6551276

Filename

6551276