Disintegration rate and gamma-ray emission probability per decay measurement of Cu-64

The procedure followed by the Nuclear Metrology Laboratory (LMN) at the IPEN for the standardization of activity of 64Cu is described. The measurement was carried out in a 4π (PC) β-γ coincidence system. The activity per unit mass of the solution was determined by the extrapolation technique. The events were registered using a Time to Amplitude Converter (TAC) associated with a Multi-channel Analyzer. The gamma-ray emission probability per decay of the 1345.7keV transition of 64Cu determined with a calibrated REGe gamma-ray spectrometer was (0.472 ± 0.010) %, in agreement with the literature. •The procedure for 4π(PC)β-γ primary standardization of 64Cu is described.•External absorbers of Collodion and aluminum were applied on both sides of sources.•An electronic system with a Time to Amplitude Converter (TAC) was used.•Determined 1345.7keVgamma-ray emission probability per decay.