Calibration of the Alpha-Spectrometry System for Radiological Evaluation of Systems and Equipment Subject to Decommissioning at Units 1-4 of Kozloduy NPP – E. Stoyanova, G. Neshovska, Tz. Nonova

During the radiological inventory evaluation of systems and equipment subject to decommissioning at units 1-4 of Kozloduy NPP, and for the purpose of radioactive waste characterization, it is necessary to determine the activity of a number of difficult-to-measure alpha-emitting radio nuclides (isotopes of uranium, plutonium, americium and curium). Their determination requires destructive analysis involving radiochemical separation of alpha-nuclides and alpha-spectrometric measurement of sources prepared via electrodeposition.

This work discuses approaches to develop and validate a calibration method of the alpha-spectrometry system used for determination of the activity of alpha-emitting radio nuclides (241Am, 238;239=240Pu, 234;235;238U).

Keywords: alpha-spectrometry, calibration, uncertainty, decommissioning.