title: Characterization of photon-emitting wide area reference sources.
abstract: A procedure has been developed to calibrate photon-emitting wide area reference sources in terms of activity, surface emission rate and uniformity considering the requirements introduced by the recent revision of ISO standard 8769. The method makes use of a large volume NaI detector with a cross table scanning system, a radiography system and it applies Monte Carlo techniques to assess the surface emission rate. The method was successfully applied to sources of (241)Am, (57)Co, (137)Cs and (60)Co. In addition, problems with definitions and the practical use of standard ISO 8769:2010 are highlighted.
authors.affiliation: Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany. Ole.J.Naehle@ptb.de
authors.forename: O
authors.initials: O
authors.lastname: Nähle
authors.forename: K
authors.initials: K
authors.lastname: Kossert
mesh_terms: D003198:Computer Simulation; D006207:Half-Life; D038622:Internationality; D008956:Models, Chemical; D009010:Monte Carlo Method; D017785:Photons; D011829:Radiation Dosage; D011868:Radioisotopes / Q000032:analysis* / Q000737:chemistry / Q000592:standards*; D011874:Radiometry / Q000295:instrumentation* / Q000592:standards*; D012015:Reference Standards; D012016:Reference Values
chemical_list: D011868:Radioisotopes