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[2] Y. S. Selim and M. I. Abbas, "Analytical calculations of gamma scintillators effi ciencies II . Total efficiency for wide coaxial circular disk sources," Radiat. Phys. Chem., vol. 58 (2000) 15.

[3] M. I. Abbas, "HPGe detector photopeak efficiency calculation including self-absorption and coincidence corrections for Marinelli beaker sources using compact analytical expressions.," Appl. Radiat. Isot., 54 (2001) 761.

[4] M. I. Abbas, S. Nafee, and Y. S. Selim, "Calibration of cylindrical detectors using a simplified theoretical approach.," Appl. Radiat. Isot., 64 (2006) 1057.

[5] M. I. Abbas, "Direct mathematical method for calculating full-energy peak efficiency and coincidence corrections of HPGe detectors for extended sources," Nucl. Instrum. Methods Phys. Res. B, vol. 256, no. 1, pp. 554–557, Mar. 2007.

[6] A. Hamzawy, "Validation of analytical formula for the efficiency calibration of gamma detectors using coaxial and off-axis extended sources," Nucl. Instrum. Methods Phys. Res. A, 618(2010) 216.

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[8] M. I. Abbas, "A direct mathematical method to calculate the efficiencies of a parallelepiped detector for an arbitrarily positioned point source," Radiation Physics and Chemistry, 60 (2001) 3.

[9] M. I. Abbas, "Validation of analytical formulae for the efficiency calibration of gamma detectors used in laboratory and in-situ measurements.," Appl. Radiat. Isot., 64 (2006) 1661.

[10] M. I. Abbas, "Analytical formulae for well-type NaI (Tl) and HPGe detectors efficiency computation.," Appl. Radiat. Isot., 55 (2001) 245.

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[12] M. I. Abbas, "Analytical calculations of the solid angles subtended by a well-type detector at point and extended circular sources.," Appl. Radiat. Isot., industry and medicine, 64 (2006) 1048.

[13] M. I. Abbas, "Analytical approach to calculate the efficiency of 4 NaI(Tl) gamma-ray detectors for extended sources," Nucl. Instrum. Methods Phys. Res. A, 615 (2010) 48.

[14] A. M. El-khatib, M. S. Badawi, M. A. Elzaher, and A. A. Thabet, "New Analytical Approach to Calculate the Full Energy Peak Efficiency for NaI ( Tl ) Gamma-Ray Detector Using the Effective Solid Angle Method," International Journal of Instrumentation Science, 1 (2012) 25.

[15] M. S. Badawi, M. Abd-Elzaher, A. A. Thabet, A. M. El-khatib, "An empirical formula to calculate the full energy peak efficiency of scintillation detectors" Appl. Radiat. Isot. 74 (2013) 46.

[16] S. M. Diab, M. S. Badawi, A. M. El-khatib, S. S. Nafee, and E. A. El-, "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, 4 (2013) 1.

[17] T. Vidmar and A. Likar, "On the invariability of the total-to-peak ratio in gamma-ray spectrometry.," Appl. Radiat. Isot. 60 (2004) 191.

[18] M. C. Lepy, T. Altzitzoglou, et al. "Intercomparison of efficiency transfer software for gamma-ray spectrometry.," Appl. Radiat. Isot. 55 (2001) 493.

[19] L. Pibida, S. S. Nafee, M. Unterweger, M. M. Hammond, L. Karam, and M. I. Abbas, "Calibration of HPGe gamma-ray detectors for measurement of radioactive noble gas sources.," Appl. Radiat. Isot. 65 (2007) 225.

[20] J. H. Hubbell and S. M. Seltzer, "Tables of X-ray mass attenuation coefficients and mass energy-absorption coefficients 1 keV to 20 MeV for elements Z=1 to 92 and 48 additional substances of dosimetric interest," NISTIR-5632 USA., vol. 5632, 1995.

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