Adaptation of PTB’s analytical modelling for TDCR–Cherenkov activity measurements at LNHB

Proceedings of the 23rd International Conference on Advances in Liquid Scintillation Spectrometry (LSC), Copenhagen, DENMARK, APR 30-MAY 05, 2017. Organizer: Tech Univ Denmark; International audience; Designed for triple to double coincidence ratio measurements based on liquid scintillation, the three-photomultipliers detection system can also be applied for Cherenkov counting using aqueous solutions. For activity determination, a specific modelling of Cherenkov light emission has to be constructed. For that purpose, the analytical modelling first developed at PTB was adapted to account for the physical features of the detection system used at LNHB. The first results are presented in the case of activity measurements of two high-energy β−-emitters (90Y and 89Sr). The analytical modelling was also tested for the standardization of 68Ge in a solution of 68Ge/68Ga in equilibrium in the framework of a BIPM international comparison in 2014.