KOSKINAS, MARINA F.KUZNETSOVA, MARIAMOREIRA, DENISE S.SCHOUERI, ROBERTO M.MORAIS, THALES S.L. deSEMMLER, RENATODIAS, MAURO da S.2019-12-272019-12-27KOSKINAS, MARINA F.; KUZNETSOVA, MARIA; MOREIRA, DENISE S.; SCHOUERI, ROBERTO M.; MORAIS, THALES S.L. de; SEMMLER, RENATO; DIAS, MAURO da S. Preliminary measurements using a Triple to Double Coincidence Ratio (TDCR) Liquid Scintillator Counter System. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. <b>Proceedings...</b> Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 1125-1131. Disponível em: http://repositorio.ipen.br/handle/123456789/30551.http://repositorio.ipen.br/handle/123456789/30551The 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. The TDCR system makes use of three photomultipliers positioned at 120° relative angle, operating in coincidence. For this preliminary measurement, 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. 14C was chosen due to be a beta pure emitter with low end-point energy of 156 keV. 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.1125-1131openAccesscarbon 14cobalt 60comparative evaluationsliquid scintillatorsphotomultipliersstandardizationtracer techniquesbrazilian cnenTexto completo de evento0000-0001-7733-01530000-0001-8407-9833https://orcid.org/0000-0003-2478-5757https://orcid.org/0000-0001-7733-0153https://orcid.org/0000-0001-8407-9833