Standardization of 110mAg by liquid scintillation and 4πβ–γ coincidence counting

The nuclide 110mAg is a β–γ emitter with a very complex decay scheme, including more than 50 γ-rays. It has been standardized by two methods: liquid scintillation counting (LSC) and 4πβ(pc)-γ coincidence measurements. In the LSC measurements the CIEMAT/NIST method was used, with 3H being used as a tracer for efficiency calculations. In the 4πβ(pc)-γ standardization, Monte Carlo calculations have been made to determine the optimal measurement conditions. Results obtained with both methods for the activity concentration of the solution are in good agreement.