title: Evaluation of the planar sources surface homogeneity used to instruments calibration.
abstract: The surface homogeneity of planar sources used to calibrate contamination detectors is important considering that their dimensions are bigger than the most kind of detectors tested and the positioning in relation to the source may vary in each measurement. Using a special pancake detector the counting efficiency of alpha and beta sources was measured in several positioning covering all area of the sources. The (14)C source showed the worse performance and the (241)Am source showed the best behavior.
authors.affiliation: Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear/SP, São Paulo, Brazil. vivolo@ipen.br
authors.forename: Vitor
authors.initials: V
authors.lastname: Vivolo
authors.forename: Maria da Penha Albuquerque
authors.initials: Mda P
authors.lastname: Potiens
mesh_terms: D001938:Brazil; D002138:Calibration; D004866:Equipment Contamination / Q000517:prevention & control*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D011829:Radiation Dosage; D011868:Radioisotopes / Q000032:analysis* / Q000592:standards*; D011874:Radiometry / Q000295:instrumentation* / Q000592:standards*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D011868:Radioisotopes