title: The radiation field characteristics of a 137Cs source used for calibration of radiation protection instruments.
abstract: In this work, an experimental study of the radiation beam characteristics of the photon beams produced by commercial irradiator that uses a single collimated 137Cs source is performed. A set of lead attenuators are placed at the exit window of the irradiator to vary the air Kerma that is required to cover the instrument scales at a particular calibration distance. The results strongly enhance the findings of previous studies that a single source with appropriate attenuation and collimation is a practical solution for calibration laboratories with an acceptable overall accuracy.
authors.affiliation: Laboratório de Ciências Radiológicas/ DBB/IBRAG da Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ-Rua São Francisco Xavier, 524. CEP: 20550-013. Rio de Janeiro. RJ Brazil.
authors.forename: E
authors.initials: E
authors.lastname: Fernandes
authors.forename: D
authors.initials: D
authors.lastname: Freire
authors.forename: A C
authors.initials: AC
authors.lastname: de Freitas
authors.forename: C E
authors.initials: CE
authors.lastname: deAlmeida
mesh_terms: D001938:Brazil; D002138:Calibration / Q000592:standards; D002588:Cesium Radioisotopes / Q000032:analysis* / Q000737:chemistry*; D004781:Environmental Exposure / Q000032:analysis* / Q000592:standards*; D011829:Radiation Dosage; D011835:Radiation Protection / Q000295:instrumentation* / Q000592:standards*; D011874:Radiometry / Q000295:instrumentation* / Q000592:standards; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D002588:Cesium Radioisotopes