Metrological activity determination of 133Ba by sum-peak absolute method

8th Brazilian Congress on Metrology

Da Silva, R.L.^1 ; De Almeida, M.C.M.^2 ; Delgado, J.U.^1 ; Poledna, R.^1 ; Santos, A.^1 ; De Veras, E.V.^1 ; Rangel, J.^1 ; Trindade, O.L.^1

Instituto de Radioproteção e Dosimetria (IRD/CNEN), avenida Salvador Allende, s/n, Barra

RJ

CEP 22783-127, Brazil^1

Comissão Nacional de Energia Nuclear (CNEN), rua Gen Severiano 82, Botafogo

RJ

CEP 22290-901, Brazil^2

关键词: Activity results;    Complex decay;    Gamma source;    Gamma spectrometry;    Germanium detector;    National laboratory;    Sum-peak method;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/733/1/012095/pdf
DOI  :  10.1088/1742-6596/733/1/012095

来源: IOP

【 摘 要 】

The National Laboratory for Metrology of Ionizing Radiation provides gamma sources of radionuclide and standardized in activity with reduced uncertainties. Relative methods require standards to determine the sample activity while the absolute methods, as sum-peak, not. The activity is obtained directly with good accuracy and low uncertainties.133Ba is used in research laboratories and on calibration of detectors for analysis in different work areas. Classical absolute methods don't calibrate133Ba due to its complex decay scheme. The sum-peak method using gamma spectrometry with germanium detector standardizes133Ba samples. Uncertainties lower than 1% to activity results were obtained.