Uncertainty of determination of 158Tb in the RBMK nuclear reactor waste

Artūras Plukis; Vytenis Barkauskas; Rūta Druteikienė; Grigorijus Duškesas; Darius Germanas; Arūnas Gudelis; Laurynas Juodis; Elena Lagzdina; Rita Plukienė; Vidmantas Remeikis

doi:10.1016/j.apradiso.2017.08.005

Uncertainty of determination of ¹⁵⁸Tb in the RBMK nuclear reactor waste

Appl Radiat Isot. 2018 Apr:134:190-193. doi: 10.1016/j.apradiso.2017.08.005. Epub 2017 Aug 3.

Affiliations

¹ Center for Physical Sciences and Technology, Savanorių Ave. 231, LT-02300 Vilnius, Lithuania.
² Center for Physical Sciences and Technology, Savanorių Ave. 231, LT-02300 Vilnius, Lithuania. Electronic address: arunas.gudelis@ftmc.lt.

PMID: 28830727
DOI: 10.1016/j.apradiso.2017.08.005

Abstract

The activity of ¹⁵⁸Tb was measured in waste samples from the Ignalina NPP Unit I RBMK-1500 reactor using gamma-ray spectrometry. The origin of ¹⁵⁸Tb and the other observed gamma-ray emitters has been studied by using SCALE 6.1 modeling and comparing radionuclide ratios in the RBMK-1500 radioactive waste. The results of the calculation of the massic activity of gamma-ray emitters were used for interpretation of the total gamma-ray spectrum and the determination of ¹⁵⁸Tb massic activity uncertainty in the waste of RBMK-1500.

Keywords: (158)Tb; Gamma-ray spectrometry; Radioactive waste; Radionuclide ratios; Scaling factors.