The present work aims the standardization of 68 Ga, a positron emitter of short half-life used in PET (Positron Emission Tomography). The 68 Ga standardization was performed in a triple 41t�-'Y coincidence system that consists of a thin window gas-flow proportional counter (PC) in 41t geometry coupled to a NaI(TI) scintillator and a HPGe crystal, for gamma-ray detection. The data acquisition was carried out by means of a Software Coincidence System (SCS) developed at the Nuclear Metrology Laboratory (Laboratorio de Metrologia Nuclear -LMN) at the IPEN-CNEN/SP. The final results were obtained from a multiple curve fitting applying a covariance matrix methodology combining experimental results with those determined by the Monte Carlo simulation.

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