Radioactivity measurements of 177Lu, 111In and 123I by different absolute methods

The activities of 177Lu, 111In and 123I solutions have been absolutely determined using three different measurement methods. 177Lu solution was standardized using the 4πβ(PC)–γ(NaI) coincidence and 4πβ(LS)–γ(NaI) live-timed anticoincidence methods. For the 111In and 123I solutions, besides these two mentioned methods, the coincidence sum-peak method was also applied. The measured activities results using these different methods are consistent within the evaluated experimental uncertainties demonstrating the equivalence of these methods. As an additional contribution to nuclear data, the half-lives have been determined using a well type IG12 ionization chamber.

► Lu-177, I-123 and In-111 have been absolutely standardized by different methods.
► Results between methods agreed within evaluated uncertainties.
► 3-Half-lives were also measured and compared with recent published results.