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Authors: 1. Christian Balpardo (LMR-CNEA, Argentina), 2. Eliana Depaoli (LMR-CNEA, Argentina), 3. Mario Rossi (LMR-CNEA, Argentina), 4. Pablo Arenillas (LMR-CNEA, Argentina), 5. Clara Ferrari (LMR-CNEA, Argentina).
Several absolute methods were employed for standardization the 65Zn solution received within the context of the CCRI(II)-K2.Zn-65 comparison: a 4 Pi gamma integral counting system with a NaI(Tl) well-type detector and a digital interface, a digital KX-gamma coincidence with two NaI(Tl) scintillation crystals of different characteristics and a sum-peak method using a HPGe planar detector with extended energy range. Five punctual sources was prepared with this nuclide that decays by electron capture to the 1115 keV excited level and by electron capture and beta plus emission to the ground state level of 65Cu. Activity standards of 65Zn are frequently used for ionization chambers calibration.
