title: Analytical approach for radioactivity correlation of disc sources with HPGe detector efficiency.
abstract: The HPGe detector efficiency is measured as a function of source to detector separation using disc sources of (131)I with diameter ranging from 10 to 400mm. Detector efficiencies are characterized using single photon point-like standard sources at different distances; the calculated efficiencies for disc sources were analyzed by utilizing the double point detector model (DPDM) and the efficiency transfer method. The developed approach provided satisfactory results. The axial variation and radial dependence for disc sources efficiency determination in gamma-ray spectrometry were described with both gamma ray standard sources and measured samples as their extended sources.
authors.affiliation: Physics Department, College of Education in Zulfi, Majmaah University, Bldg. 8589, Al-Zulfi 15942-2588 , Saudi Arabia; Physics Department, Nuclear Research Center, Atomic Energy Authority, Cairo 13759, Egypt.
authors.forename: Mohsen B
authors.initials: MB
authors.lastname: Challan
authors.affiliation: Physics Department, Faculty of Science, Assiut University, Assiut, Egypt; Physics Department, Faculty of Science, Qassim University, Buraydah, Saudi Arabia. Electronic address: atef_eltaher@hotmail.com.
authors.forename: A
authors.initials: A
authors.lastname: El-Taher
keywords: Efficiency correction; Efficiency transfer method; Gamma-ray spectrometry; Geometry effects; High-purity germanium detector