https://doi.org/10.1051/epjconf/201714608010
In-flight annihilation correction for 511 keV photon spectrometry
1 iThemba LABS, PO Box 722, Somerset West, 7129, South Africa
2 Cyclotron Application Department, ATOMKI, PO Box 51, 4001, Debrecen, Hungary
3 Paul Scherrer Institute, Villigen-PSI, Switzerland
a e-mail: deon@tlabs.ac.za
Published online: 13 September 2017
Spectrometry based on the 511 keV annihilation photopeak requires the positron source to be surrounded by a suitable absorber material. While this method is well established in the literature, correction for in-flight annihilation losses from the 511 keV photopeak is often found to be neglected. Application to volume sources, such as typically employed in a radionuclide production environment for yield determination and quality control (QC) purposes, is presented. Source strengths obtained by analyzing the 511 keV photopeak are compared with values obtained from characteristic γ-lines for a selection of non-pure positron emitters. Better overall agreement is obtained when in-flight annihilation loss corrections are explicitly performed.
© The Authors, published by EDP Sciences, 2017
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