MARINA FALLONE KOSKINAS

Resumo

Graduate at Física from Pontifícia Universidade Católica de São Paulo (1972), master's at Nuclear Engineering from Universidade de São Paulo (1978) and ph.d. at Nuclear Engineering from Universidade de São Paulo (1988). Has experience in Nuclear Engineering, focusing on Instrumentation for Measure and Control of Radiation, acting on the following subjects: radionuclide metrology, standardizations in coincidence system, determination of nuclear parameters, gamma emission probability per decay. (Text obtained from the Currículo Lattes on November 17th 2021)


Possui graduação em Física pela Pontifícia Universidade Católica de São Paulo (1972), mestrado em Tecnologia Nuclear pela Universidade de São Paulo (1978) e doutorado em Tecnologia Nuclear pela Universidade de São Paulo (1988). Atualmente é pesquisador titular do Instituto de Pesquisas Energéticas e Nucleares. Tem experiência na área de Engenharia Nuclear, com ênfase em Instrumentação para Medida e Controle de Radiação, atuando principalmente nos seguintes temas: metrologia de radionuclídeos, padronização em sistemas de coincidências, determinação de parâmetros nucleares como probabilidade de emissão gama por decaimento. (Texto extraído do Currículo Lattes em 17 nov. 2021)

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Agora exibindo 1 - 10 de 10
  • Artigo IPEN-doc 26202
    Preliminary study of radionuclide standardization by TDCR method applying a time-to-amplitude converter
    2019 - MORAIS, THALES S.L. de; KOSKINAS, MARINA F.; MOREIRA, DENISE S.; DIAS, MAURO da S.
    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.
  • Artigo IPEN-doc 26201
    Preliminary measurements using a Triple to Double Coincidence Ratio (TDCR) Liquid Scintillator Counter System
    2019 - KOSKINAS, MARINA F.; KUZNETSOVA, MARIA; MOREIRA, DENISE S.; SCHOUERI, ROBERTO M.; MORAIS, THALES S.L. de; SEMMLER, RENATO; DIAS, MAURO da S.
    The 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.
  • Artigo IPEN-doc 24096
    Primary standardization of 90Sr-90Y radioactive solution
    2017 - KOSKINAS, MARINA F.; MARQUES, CAIO P.; MOREIRA, DENISE S.; RAJPUT, MUHAMMAD U.; YAMAZAKI, IONE M.; DIAS, MAURO S.
    In the present work, the procedure developed by the Nuclear Metrology Laboratory (LMN) at IPEN, for the primary standardization of 90Sr-90Y, is presented. The method applied has been the efficiency tracing technique using a  coincidence system. That consists in the measurement of a beta pure emitter along with a beta-gamma emitter, previously standardized, which will provide the beta efficiency. In this work, the beta-gamma emitter used was 60Co. The beta efficiency has varied using external absorbers, and the specific activity was determined using the extrapolation curve. ESQUEMA Code, which predicts the extrapolation curve by means of Monte Carlo technique, was applied, and the specific activity obtained from Monte Carlo simulation was compared with the experimental, showing good agreement within the experimental uncertainties.
  • Artigo IPEN-doc 20990
    Standardization of C-14 by tracing method
    2015 - KOSKINAS, MARINA F.; KUZNETSOVA, MARIA; YAMAZAKI, IONE; BRANCACCIO, FRANCO; DIAS, MAURO S.
  • Artigo IPEN-doc 10639
    Optimization of sample preparation for 4PiBeta-gamma coincidence measurements
    2005 - DIAS, M.S.; KOSKINAS, M.F.; YAMAZAKI, I.M.
  • Artigo IPEN-doc 10748
    Monte Carlo simulation of a digital coincidence system applied to sup(60)Co standardization
    2005 - BRANCACCIO, F.; DIAS, M.S.; KOSKINAS, M.F.
  • Artigo IPEN-doc 10918
    Desenvolvimento de fontes radioativas solidas em resina acrilamida
    2004 - YAMAZAKI, I.M.; KOSKINAS, M.F.; DIAS, M.S.; ANDRADE e SILVA, L.G.; VIEIRA, J.M.
  • Artigo IPEN-doc 07101
    Primary standardization of sup(242)Am radioactive sources
    2001 - MAIDANA, N.L.; DIAS, M.S.; KOSKINAS, M.F.
  • Artigo IPEN-doc 07102
  • Artigo IPEN-doc 12015
    Optimization of the method for preparing water-equivalent solid sources
    2007 - KOSKINAS, MARINA F.; YAMAZAKI, IONE M.; SILVA, PAULO R.; ANDRADE e SILVA, LEONARDO G.; VIEIRA, JOSE M.; DIAS, MAURO S.