title: New analytical approach to calibrate the NaI (Tl) detectors using spherical radioactive sources.
abstract: A new theoretical approach was used to calibrate and calculate the full-energy peak efficiency of the NaI (Tl) detectors based on the direct statistical method proposed by Selim and Abbas for cylindrical detectors. In addition, the self-attenuation of the source matrix, the attenuation by the source container and the detector housing materials were considered in the mathematical treatment. Results were compared with those measured by a cylindrical NaI (Tl) detector with resolution (FWHM) at 662 keV equal to 7.5 %. (152)Eu aqueous radioactive spherical sources covering the energy range from 121 to 1408 keV were used. In comparison, the calculated and the measured full-energy peak efficiency values were in good agreement.
authors.affiliation: Physics Department, Faculty of Science, Alexandria University, 21511 Alexandria, Egypt.
authors.forename: Ahmed M
authors.initials: AM
authors.lastname: El-Khatib
authors.forename: Mona M
authors.initials: MM
authors.lastname: Gouda
authors.forename: Mohamed S
authors.initials: MS
authors.lastname: Badawi
authors.forename: Sherif S
authors.initials: SS
authors.lastname: Nafee
authors.forename: Ekram A
authors.initials: EA
authors.lastname: El-Mallah
mesh_terms: D000465:Algorithms; D002138:Calibration; D004867:Equipment Design; D005063:Europium / Q000032:analysis; D008962:Models, Theoretical; D017785:Photons; D011834:Radiation Monitoring / Q000295:instrumentation / Q000379:methods; D011874:Radiometry / Q000295:instrumentation / Q000379:methods*; D012974:Sodium Iodide / Q000737:chemistry*; D013793:Thallium / Q000737:chemistry
chemical_list: D005063:Europium; D013793:Thallium; D012974:Sodium Iodide