Fluorescence correction for activity measurement of ^93mNb in niobium dosimeters: Calculation and experimental validation

¹ Université Paris-Saclay, CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), 91120 Palaiseau, France
² CEA, DES/IRESNE/DER/SPESI, Laboratoire de Dosimétrie, Capteurs et Instrumentation (LDCI), Cadarache, 13108 Saint Paul-lez-Durance, France
³ Université Paris-Saclay, CEA, ISAS/DM2S, Service d’études des réacteurs et de mathématiques appliquées, 91191 Gif-sur-Yvette cedex, France

^* Corresponding author: marie-christine.lepy@cea.fr

Published online: 2 March 2023

Abstract

Niobium is a dosimeter used to characterize fast-neutron reaction rates to monitor nuclear reactor vessels. Its characterization is based on the activity of ^93mNb resulting from the ⁹³Nb(n,n’) activation reaction. The decay of ^93mNb results mainly in the emission of niobium K X-rays which are used to determine the activity of ^93mNb. Direct measurement using X-ray spectrometry does not require any sample preparation, but fluorescence effects, due to impurities which are activated during irradiation, must be taken into account. Indeed, some of these radioactive impurities, in particular ¹⁸²Ta, and other niobium isotopes remain present during the measurements and disturb the X-ray spectra. The fluorescence effect induces additional niobium X-ray emission to that due to the ^93mNb decay alone, which leads to an overestimation of the dosimeter activity, especially if the results are expected shortly after the end of the irradiation. It is therefore necessary to assess the contribution of fluorescence effects to provide accurate values of ^93mNb activity. Fluorescence correction factors were established by Monte Carlo simulation. The calculated fluorescence correction factors were validated by an experimental approach, using activated niobium dosimeters with different tantalum concentrations.