title: Comparative measurements in dose calibrators and a gamma-ray spectrometer.
abstract: Specific activity results of (51)Cr, (67)Ga, (99m)Tc and (201)Tl radioactive solutions, measured in different dose calibrators located at nuclear medicine services and in a calibrated HPGe gamma spectrometer, were compared. The HPGe spectrometer was calibrated in a well defined geometry by means of (60)Co, (133)Ba, (152)Eu, (166m)Ho and (241)Am sources, previously standardized in a 4pibeta-gamma coincidence system. Despite the observed differences, the results may be accepted within the 10% uncertainty range, established by Brazilian regulatory standards.
authors.affiliation: Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP), Centro do Reator de Pesquisas-CRPq, Pinheiros, São Paulo-SP, Brazil. mafalko@yahoo.com.br
authors.forename: Marina F
authors.initials: MF
authors.lastname: Koskinas
authors.forename: Ione M
authors.initials: IM
authors.lastname: Yamazaki
authors.forename: Ana C M
authors.initials: AC
authors.lastname: Bessa
authors.forename: Linda V E
authors.initials: LV
authors.lastname: Caldas
authors.forename: Mauro S
authors.initials: MS
authors.lastname: Dias
mesh_terms: D001938:Brazil; D002138:Calibration; D004867:Equipment Design; D019544:Equipment Failure Analysis; D011829:Radiation Dosage; D011868:Radioisotopes / Q000032:analysis*; D011874:Radiometry / Q000295:instrumentation* / Q000592:standards*; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013051:Spectrometry, Gamma / Q000295:instrumentation* / Q000592:standards*
chemical_list: D011868:Radioisotopes