Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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STUDY ON THE EFFECT OF THE SELF-ATTENUATION COEFFICIENT ON γ-RAY DETECTOR EFFICIENCY CALCULATED AT LOW AND HIGH ENERGY REGIONS

  • El-Khatib, Ahmed M. (Physics Department, Faculty of Science, Alexandria University) ;
  • Thabet, Abouzeid A. (Department of Medical Equipment Technology, Pharos University in Alexandria) ;
  • Elzaher, Mohamed A. (Department of Basic and Applied Sciences, Faculty of Engineering, Arab Academy for Science, Technology and Maritime Transport) ;
  • Badawi, Mohamed S. (Physics Department, Faculty of Science, Alexandria University) ;
  • Salem, Bohaysa A. (Basic Science Department, Faculty of Physical Therapy, Pharos University in Alexandria)
  • Received : 2013.08.20
  • Accepted : 2013.10.02
  • Published : 2014.04.25
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Abstract

The present work used the efficiency transfer method used to calculate the full energy peak efficiency (FEPE) curves of the (2"*2" & 3"*3") NaI (Tl) detectors based on the effective solid angle subtended between the source and the detector. The study covered the effect of the self attenuation coefficient of the source matrix (with a radius greater than the detector's radius) on the detector efficiency. $^{152}$ An Eu aqueous radioactive source covering the energy range from 121.78 keV up to 1408.01 keV was used. In this study an empirical formula was deduced to calculate the difference between the measured and the calculated efficiencies [without self attenuation] at low and high energy regions. A proper balance between the measured and calculated efficiencies [with self attenuation] was achieved with discrepancies less than 3%, while reaching 39% for calculating values [without self attenuation] due to working with large sources, or for low photon energies.

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References

  1. L. Moens and J. Hoste, "Calculation of the peak efficiency of high-purity germanium detectors." Int. J. Appl. Radiat. Isot., vol 34, pp.1085-1095 (1983). https://doi.org/10.1016/0020-708X(83)90174-6
  2. G. Haase, D. Tait and A. Wiechon, "Application of new Monte Carl method for determination of summation and self-attenuation corrections in gamma spectrometry." Nucl. Instrum. Methods A., vol 336, pp. 206-214 (1993). https://doi.org/10.1016/0168-9002(93)91099-9
  3. O. Sima and D. Arnold, "Self-attenuation and coincidence summing corrections calculated by Monte Carlo simulations for gamma-spectrometric measure- ments with well-type germanium detectors." Appl. Radiat. Isot., vol 47, pp.889-893 (1996). https://doi.org/10.1016/S0969-8043(96)00082-6
  4. T. K. Wang, W. Y. Mar, T. H. Ying, C.H. Tseng, C.H. Liao and M.Y. Wang, "HPGe Detector efficiency calibration for extended cylinder and Marinelli- beaker sources using the ESOLAN program." Appl. Radiat. Isot., vol 48, pp.83-95 (1997). https://doi.org/10.1016/S0969-8043(96)00062-0
  5. Y. S. Selim, M. . Abbas and M.A. Fawzy, "Analytical calculation of the efficiencies of gamma scintillators. Part I: total efficiency of coaxial disk sources." Radiat. Phys. Chem., vol 53, pp.589-592 (1998). https://doi.org/10.1016/S0969-806X(97)00277-6
  6. Y. S. Selim and M. I. Abbas, "Analytical calculations of gamma scintillators efficiencies. Part II: total efficiency for wide coaxial disk sources." Radiat. Phys. Chem. vol 58, pp.15-19 (2000). https://doi.org/10.1016/S0969-806X(99)00357-6
  7. M. I. Abbas, "HPGe detector photopeak efficiency calculation including self-absorption and coincidence corrections for Marinilli beaker sources using compact analytical expressions." Appl. Radiat. Isot. vol 54, pp.761-768 (2001). https://doi.org/10.1016/S0969-8043(00)00308-0
  8. M. S. Badawi, M. M. Gouda, S. S. Nafee, A. M. El-Khatib and E. A. El-Mallah, "New algorithm for studying the effect of self attenuation factor on the efficiency of ${\gamma}$-rays detectors." Nuclear Instruments and Methods in Physics Research A. vol 696, pp.164-170 (2012). https://doi.org/10.1016/j.nima.2012.08.089
  9. M. S. Badawi, M. M. Gouda, S. S. Nafee, A. M. El-Khatib and E. A. El-Mallah, "New Analytical Approach to Calibrate the Co-axial HPGe Detectors Including Correction for Source Matrix Self-attenuation." Applied Radiation and Isotopes., vol 70, No. 12, pp.2661-2668 (2012). https://doi.org/10.1016/j.apradiso.2012.08.014
  10. M. S. Badawi, M. Abd-Elzaher, A. A. Thabet and A. M. El-khatib, "An empirical formula to calculate the full energy peak efficiency of scintillation detectors." Applied Radiation and Isotopes., vol 74, pp.46-49 (2013). https://doi.org/10.1016/j.apradiso.2012.12.011
  11. S. M. Diab, M. S. Badawi, A. M. El-Khatib, Sherif. S. Nafee and E. A. El-Mallah, "Computation of the Efficiency of NaI (Tl) Detectors Using Radioactive Inverted Well Beaker Sources Based on Efficiency Transfer Technique." Journal of Advanced Research in Physics., vol 4(1), 011301 (2013).
  12. M. M. Gouda, A. M. El-Khatib, M. S. Badawi, E. A. El-Mallah and S. S. Nafee, "New Analytical Approach to Calculate the Co-axial HPGe Detector Efficiency Using Parallelepiped Sources." Journal of Advanced Research in Physics., vol 4(1), 011303 (2013).
  13. N. Tsoulfanidis, "Measurement and Detection of Radiation" Taylor & Francis, Washington, (1995).
  14. M. S. Badawi, PhD. Thesis, Faculty of Science, Alexandria University, Egypt, (2010).
  15. M. Abd-Elzaher, M. S. Badawi, A. M. El-Khatib and A. A. Thabet, "Determination of Full Energy Peak Efficiency of NaI(Tl) Detector Depending on Efficiency Transfer Principle for Conversion Form Experimental Values." World Journal of Nuclear Science and Technology, vol 2, pp.65-72 (2012). https://doi.org/10.4236/wjnst.2012.23011
  16. A. M. El-Khatib, M. S. Badawi, M. Abd-Elzaher and A. A. Thabet, "Calculation of the Peak Efficiency for NaI(Tl) Gamma Ray Detector Using the Effective Solid Angle Method." Journal of Advanced Research in Physics., vol 3(2), 021204 (2012).
  17. M. C. Lepy, T. Altzitzoglou, D. Arnold, etal., "Intercomparison of efficiency transfer software for gamma-ray spectrometry." Appl.Radiat.Isot., vol 55(4), pp.493-503 (2001). https://doi.org/10.1016/S0969-8043(01)00101-4
  18. T. Vidmar, I. Aubineau-Laniece, Anagnostakis, M.J., et al., "An intercomparison of Monte Carlo codes used in gamma-ray spectrometry." Appl. Radiat. Isot., vol 66 (6-7), pp.764-768 (2008). https://doi.org/10.1016/j.apradiso.2008.02.015
  19. K. Debertin, and U. Schotzig," Coincidence summing corrections in Ge(Li)-spectrometry at low source-to-detector distances.", Nucl. Instrum.Meth.A., vol 158, pp.471-477 (1979). https://doi.org/10.1016/S0029-554X(79)94845-6
  20. R. Van Grieken and M. De Bruin, "Nomenclature For Radioanalytical Chemistry." Pure &App. Chem, vol. 66, No. 12, pp.2513-2526 (1994).

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