Standardization of 64Cu using an improved decay scheme

A 64Cu solution was standardized by means of liquid scintillation counting. The activity of the solution was also determined with an ionization chamber whose response was simulated by using a Monte Carlo code. The photon emission intensities including K X-rays were determined to be I511=35.1 (3)%; I1346=0.472 (12)%, IKα=14.41 (15)%, IKβ=2.01 (3)%, respectively. 64Cu half-life was also determined as 12.718 (23) h. The new decay scheme used in the present work was established following the EURAMET 1085 exercise where a good agreement between activity measurement techniques was found.