TDCR and CIEMAT/NIST Liquid Scintillation Methods applied to the Radionuclide Metrology

8th Brazilian Congress on Metrology

Da Cruz, P.A.L.^1 ; Da Silva, C.J.^1 ; Iwahara, A.^1 ; Loureiro, J.S.^1 ; De Oliveira, A.E.^1 ; Tauhata, L.^1 ; Lopes, R.T.^2

Instituto de Radioproteçã O e Dosimetria/Comissão Nacional de Energia Nuclear, Av. Salvador Allende s/no, Barra da Tijuca, Rio de Janeiro

CEP 22783-127, Brazil^1

Programa de Engenharia Nuclear, Universidade Federal Do Rio de Janeiro (PEN/COPPE, UFRJ), Caixa Postal 68590, Ilha do Fundão, Rio de Janeiro

CEP 21945-970, Brazil^2

关键词: Activity standardization;    Detection efficiency;    Detection system;    Electron capture;    Liquid Scintillation;    Poisson statistic;    Positron emission;    Quenching parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/733/1/012099/pdf
DOI  :  10.1088/1742-6596/733/1/012099

来源: IOP

【 摘 要 】

This work presents TDCR and CIEMAT/NIST methods of liquid scintillation implemented in National Institutes of Metrology for activity standardization of radionuclides, which decay by beta emission and electron capture. The computer codes used to calculate the detection efficiency take into account: decay schemes, beta decay theory, quenching parameter evaluation, Poisson statistic model and Monte Carlo simulation for photon and particle interactions in the detection system. Measurements were performed for pure emitters3H,14C,99Tc and for68Ge/68Ga which decay by electron capture and positron emission, with uncertainties smaller than 1% (k = 1).