Measurement of beta-plus emitters by gamma-ray spectrometry

The activity measurement of beta-plus emitters by gamma-ray spectrometry is studied. Experimental measurements are performed with 22Na, 65Zn and 64Cu with sources included in a lead container. For these nuclides, the activity can be derived both from one photon emission peak and from the 511 keV annihilation peak, including annihilation in-flight correction and geometry correction computed by Monte Carlo simulation. The activity values obtained using the two types of peaks show satisfying agreement. The extension of the method to volume sources is discussed.