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In 1988 LMRI from IFIN-HH carried out the first measurements of Cd-109 standardization within an international comparison organized by BIPM. The measurements were performed using the 4π(PC)ce-NaI(Tl)X coincidence counting and Ge(Li) γ-ray spectrometer.
This paper presents the results obtained by LMRI, IFIN-HH of Cd-109 standardization using two methods within the scope of an international comparison, CCRI(II)-K2.Cd-109, 2021-2022. The 4π(LS)ce and HPGe γ-ray spectrometer counting methods were used to determine the activity of the Cd-109. The spectra containing the Auger electrons and conversion electrons was measured using a liquid scintillation analyzer, TRICARB 4910TR type. The measured spectrum was fitted by Gaussian peaks using ORIGIN in order to set a threshold between the Auger electron peak and the conversion electron peak. The transfer of the HPGe detection efficiency was performed by MC simulations using Gespecor software. The activities of Cd-109 determined by the two methods are in good agreement with a relative difference less than 1.5%.
