title: A novel method for the activity measurement of large-area beta reference sources.
abstract: A novel method has been developed for the activity measurement of large-area beta reference sources. It makes use of two emission rate measurements and is based on the weak dependence between the source activity and the activity distribution for a given value of transmission coefficient. The method was checked experimentally by measuring the activity of two ((60)Co and (137)Cs) large-area reference sources constructed from anodized aluminum foils. Measurement results were compared with the activity values measured by gamma spectrometry. For each source, they agree within one standard uncertainty and also agree within the same limits with the certified values of the source activity.
authors.affiliation: National Institute of R&D for Physics and Nuclear Engineering-Horia Hulubei, IFIN-HH, P.O. Box MG-6, Bucharest-Magurele R-077125, Romania. Electronic address: doru@nipne.ro.
authors.forename: D
authors.initials: D
authors.lastname: Stanga
authors.affiliation: Instituto Nazionale di Metrologia delle Radiazioni Ionizzante, ENEA, C.R. Casaccia, P.O. Box 2400, I-00100 Rome, Italy.
authors.forename: P
authors.initials: P
authors.lastname: De Felice
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington TW11 0LW, UK.
authors.forename: J
authors.initials: J
authors.lastname: Keightley
authors.affiliation: Instituto Nazionale di Metrologia delle Radiazioni Ionizzante, ENEA, C.R. Casaccia, P.O. Box 2400, I-00100 Rome, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Capogni
authors.affiliation: National Institute of R&D for Physics and Nuclear Engineering-Horia Hulubei, IFIN-HH, P.O. Box MG-6, Bucharest-Magurele R-077125, Romania.
authors.forename: M R
authors.initials: MR
authors.lastname: Ioan
mesh_terms: D000465:Algorithms; D001610:Beta Particles; D038622:Internationality; D009716:Numerical Analysis, Computer-Assisted; D011868:Radioisotopes / Q000032:analysis* / Q000592:standards*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013051:Spectrometry, Gamma / Q000379:methods* / Q000592:standards*
chemical_list: D011868:Radioisotopes
keywords: Large area reference sources; Method of measurement; Numerical model