Standardization of 169Yb and γ-ray emission probability data

Within the framework of EUROMET project No. 410, standardization of a 169Yb solution has been carried out and the gamma-ray emission probabilities at its decay have been measured. 169Yb activity was measured by the 4πβ–γ-coincidence extrapolation method. Special attention was paid to the measurement conditions associated with the existence of 316 keV metastable level of 169Tm (T≈0.66 μs). The 169Yb gamma-ray emission probabilities have been determined from the results of absolute activity measurements and data obtained using a coaxial Ge(Li) spectrometer.