Optimization study of a new β
+-γ coincidence positron annihilation lifetime spectrometer using Geant4
W. Xu,
Y.H. Li,
Z.W. Pan
et al.
Abstract:Positron annihilation lifetime (PAL) spectroscopy is a
unique method for characterizing atomic-scale defects and
ultramicropores in materials. The conventional PAL spectrometer
adopts the γ-γ coincidence principle, and its
performance, especially the coincidence counting rate (CCR), can
hardly be further increased. Another coincidence principle,
β
+-γ coincidence, has the potential to
simultaneously improve the CCR and coincidence time resolution (CTR)
of PAL spectrometers. H… Show more
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