Characterization of filters for efficiency variation in TDCR

Abstract

This work presents developments related to the efficiency variation technique used for the standardization of radionuclides by the Triple-to-Double Coincidence Ratio (TDCR) method. We propose and develop new type of 3D printed mesh filters for detection efficiency variation, as well as a method for the quantitative characterization of the filters that allows a priori estimation of the Triple-to-Double Coincidence Ratio. A set of the developed filters is characterized using the proposed method. Experiments for efficiency variation measurements of two different liquid scintillation (LS) samples, 3H in UltimaGold cocktail and 14C in toluene-based cocktail were performed on the TDCR detector at Sofia University. The preformed experiments indicate that the proposed characteristic of the filters is a genuine characteristic of the filter and does not depend on the LS cocktail that is used. Characterized filters could be used to predict the TDCR that will be obtained when the sample with a filter is measured.