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The Nuclear Metrology Laboratory (LMN) at the Nuclear and Energy Research Institute (IPEN – São Paulo, Brazil) has recently developed the Software Coincidence System (SCS), for the digitalization and recording of signals from its 4πβ−γ detection systems. SCS features up four independent analog inputs, enabling the simultaneous recording of up four detectors (β and γ). The analysis task is performed a posteriori, by means of specialized software, including the setting up of energy discrimination levels, dead-time and coincidence resolution time. The software initially installed was able to perform a basic analysis, for the standardization of simple decay radionuclides, such as Co. The present work improves the SCS analysis methodology, in order to enable the use of high resolution detectors (HPGe), for standardization of complex decay radionuclides, including metastable transitions or different decay branches. A program called Coincidence Analyzing Task (CAT) was implemented for the data processing. The work also includes an application section, where the standardization results of Eu (different decay branches) and Ga (with a metastable level) are presented. The Eu standardization was considered for the methodology validation, since it was accomplished by the measurement of a sample previously standardized in an international comparison sponsored by the BIPM (Bureau International des Poids et Mesures). The activity value obtained in this work, as well as its accuracy, could be compared to those obtained by important laboratories in the world. The Ga standardization includes the measurement of five samples, with activity values normalized by Monte Carlo simulation. The 93 keV metastable level half-life and the gamma emission probabilities per decay for nine transition of Ga are also presented. The metastable half-life was obtained by three different methods: βprompt-γdelayed-HPGe, βprompt-γdelayed-NaI and βprompt-βdelayed.

Metodologia de aquisição de dados e análise por software, para sistemas de coincidências 4πβ-γ e sua aplicação na padronização de radionuclídeos, com ênfase em transições metaestáveis