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Measurement of three gamma annihilation by lanthanum-based crystals compared with NaI(Tl) and HPGe

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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.

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Acknowledgment

The authors extend their appreciation to the Deanship of Scientific Research at King Saud University for funding the work through the research group project number RGP-VPP-085.

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Authors and Affiliations

  1. Department of Radiological Sciences, College of Applied Medical Sciences, King Saud University, P. O. Box 10219, Riyadh, 11433, Saudi Arabia

    M. Alkhorayef, K. Alzimami, A. Alfuraih, M. Alnafea & N. M. Spyrou

  2. Department of Physics, Centre for Nuclear and Radiation Physics, University of Surrey, Guildford, GU2 7XH, UK

    N. M. Spyrou

Authors
  1. M. Alkhorayef
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  2. K. Alzimami
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  3. A. Alfuraih
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  4. M. Alnafea
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  5. N. M. Spyrou
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Correspondence to M. Alkhorayef.

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Alkhorayef, M., Alzimami, K., Alfuraih, A. et al. Measurement of three gamma annihilation by lanthanum-based crystals compared with NaI(Tl) and HPGe. J Radioanal Nucl Chem 291, 493–496 (2012). https://doi.org/10.1007/s10967-011-1316-3

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  • DOI: https://doi.org/10.1007/s10967-011-1316-3

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