KOSKINAS, M.F.KUZNETSOVA, M.MOREIRA, D.S.SHOUERI, R.M.YAMAZAKI, I.M.MORAIS, T.S.L.SEMMLER, R.DIAS, M.S.2021-08-042021-08-042021KOSKINAS, M.F.; KUZNETSOVA, M.; MOREIRA, D.S.; SHOUERI, R.M.; YAMAZAKI, I.M.; MORAIS, T.S.L.; SEMMLER, R.; DIAS, M.S. Preliminary measurements using a Triple to Double Coincidence Ratio (TDCR) Liquid Scintillator Counter System. <b>Brazilian Journal of Radiation Sciences</b>, v. 9, n. 1A, p. 1-14, 2021. DOI: <a href="https://dx.doi.org/10.15392/bjrs.v9i1A.1512">10.15392/bjrs.v9i1A.1512</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/32131.2319-0612http://repositorio.ipen.br/handle/123456789/32131The preliminary measurements using a Triple to Double Coincidence Ratio (TDCR) Liquid Scintillator Counter System, developed by the Nuclear Metrology Laboratory (LMN) at IPEN, is presented and 14C was selected to be standardized. This solution was previously calibrated by the efficiency tracing technique using a (PC)coincidence system, employing 60Co as a tracer. In order to determine the final activity, a Monte Carlo simulation was used to generate the extrapolation curve. The Software Coincidence System (SCS) developed by the LMN was used for both systems to register the events. MICELLE 2 code was used to calculate the theoretical TDCR efficiency. Measurements using HIDEX, a commercial liquid scintillator system, were also carried out and the results from the three methods were compared, showing a good agreement.1-14openAccesscarbon 14cobalt 60comparative evaluationsgamma radiationliquid scintillatorsmonte carlo methodphotomultipliersstandardizationtracer techniquesArtigo de periódico1A910.15392/bjrs.v9i1A.15120000-0001-7733-01530000-0001-8407-9833https://orcid.org/0000-0003-2478-5757https://orcid.org/0000-0001-7733-0153https://orcid.org/0000-0001-8407-9833Sem Percentil