title: Monte Carlo calculations of the HPGe detector efficiency for radioactivity measurement of large volume environmental samples.
abstract: A fully detailed Monte Carlo geometrical model of a High Purity Germanium detector with a (152)Eu source, packed in Marinelli beaker, was developed for routine analysis of large volume environmental samples. Then, the model parameters, in particular, the dead layer thickness were adjusted thanks to a specific irradiation configuration together with a fine-tuning procedure. Thereafter, the calculated efficiencies were compared to the measured ones for standard samples containing (152)Eu source filled in both grass and resin matrices packed in Marinelli beaker. From this comparison, a good agreement between experiment and Monte Carlo calculation results was obtained highlighting thereby the consistency of the geometrical computational model proposed in this work. Finally, the computational model was applied successfully to determine the (137)Cs distribution in soil matrix. From this application, instructive results were achieved highlighting, in particular, the erosion and accumulation zone of the studied site.
authors.affiliation: Centre de Recherche Nucléaire d'Alger, 02, Bd. Frantz Fanon, B.P. 399, 16000, Alger-Gare, Algiers, Algeria.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Azbouche
authors.affiliation: USTHB, Faculté de Physique, Laboratoire SNIRM, B.P. 32, El-Alia, 16111, Bab Ezzouar, Algiers, Algeria. Electronic address: belgaidm@yahoo.com.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Belgaid
authors.affiliation: Centre de Recherche Nucléaire d'Alger, 02, Bd. Frantz Fanon, B.P. 399, 16000, Alger-Gare, Algiers, Algeria.
authors.forename: Hakim
authors.initials: H
authors.lastname: Mazrou
mesh_terms: D002588:Cesium Radioisotopes / Q000032:analysis*; D005063:Europium / Q000032:analysis*; D005857:Germanium; D008962:Models, Theoretical; D009010:Monte Carlo Method; D011834:Radiation Monitoring / Q000379:methods*; D011868:Radioisotopes / Q000032:analysis*; D012990:Soil Pollutants, Radioactive / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D011868:Radioisotopes; D012990:Soil Pollutants, Radioactive; D005857:Germanium; D005063:Europium
keywords: (137)Cs distribution in soil; (152)Eu Marinelli source; Detector efficiency; Gamma-ray spectrometry; Germanium dead layer; Monte Carlo simulation