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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/14809

Title: Measurement of Three Gamma Annihilation by Lanthanum-based Crystals Compared with NaI(Tl) and HPGe
Authors: M. Alkhorayef
K. Alzimami
A. Alfuraih
Alnafea, N.M. Spyrou
Keywords: positron emission tomography (PET), lanthanum based crystals. three gamma annihilation, peak-to-peak method, peak-to-valley method, relative yield of 3γ to 2γ annihilation.
Issue Date: 2011
Publisher: Springer
Abstract: The relative yield of 3γ to 2γ annihilation was measured for a positron emitter, 22Na, with the new scintillator detectors lanthanum chloride (LaCl3:Ce¬¬) and lanthanum bromide (LaBr3:Ce¬¬), which had been characterised for comparison with high-purity germanium (HPGe) and sodium iodide (NaI(Tl)) detectors. The information obtained from the ortho-positronium 3γ decay in positron emission tomography (PET) can be a measure of the oxygen content in biological tissues by determination of this relative yield. However, it requires high resolution spectroscopy and detection efficiency. Characterisation of the new generation of scintillator detectors determines whether they could replace conventional scintillators and semiconductors. A series of experiments was carried out with different samples in order to study the effect of ortho-positronium formation. The peak-to-peak and the peak-to-valley methods were compared in the measurement of the relative yield of 3γ to 2γ annihilation.
URI: http://hdl.handle.net/123456789/14809
Appears in Collections:College of Applied Medical Sciences

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