Preliminary study of radionuclide standardization by TDCR method applying a time-to-amplitude converter

• Autor(a) principal: MORAIS, THALES S.L. de
• Data de Publicação: 2019
• Outros Autores: KOSKINAS, MARINA F., MOREIRA, DENISE S., DIAS, MAURO da S., INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
• Tipo de documento: Artigo de conferência
• Título da fonte: Repositório Institucional do IPEN
• Texto Completo: http://repositorio.ipen.br/handle/123456789/30552
• topic: carbon 14; cobalt 60; comparative evaluations; liquid scintillators; photomultipliers; standardization; tracer techniques; brazilian cnen

This paper proposes an alternative to the use of counters for the standardization of radionuclides in a 3-photodetectors liquid scintillation counter by the triple to double coincidence ratio (TDCR) method using an electronic system for processing pulses that allows the subtraction of the accidental coincidences. The electronic system consists of ampli ers, discriminators, logic gates and delay modules feeding a time-to-amplitude converter (TAC) with output to a multichannel analyzer (MCA). This system does not require individual counters for each photodetector and coincident counts contribute to the noise reduction. The method compares 3 di erent TAC spectra registered in MCA with 4, 3 or 2 peaks obtained from di erent con gurations of the electronic system. For testing the system, a series of measurements with a 90Sr standard solution was performed.