Abstract
In the framework of maintenance activities in particle accelerators, such as upgrades and dismantling, a large number of activated equipment are removed from the accelerator complex and require characterization in view of their disposal as radioactive waste. In particular, cables can be of different types. This feature induces variations of the efficiency calibration curves due to the variation of the material composition, source distribution and density. Hence, quantifying the activities of the gamma-emitting radionuclides can be quite challenging for mixed cables. In this article, we propose a new qualification methodology, based on gamma spectrometry, in order to assess the activity results uncertainties of gamma-emitting radionuclides. This new methodology is developed to define the envelop efficiency calibration curves and allows for the establishment of more accurate activity values with their corresponding uncertainties.
Highlights
Introduction and contextThe purpose of the project “ELICA” (ELImination of very low-level waste (VLLW) CAbles) is to establish the elimination pathway of VLLW cables towards the French repository
It details the influence of the geometry parameters on the values of the efficiency calibration uncertainties related to the ELICA project
We developed a Data Analyzer framework named “GURU” (Frosio et al, n.d.), which compares the output of ISOCS Uncertainty Estimator (IUE) for a set of gamma spectrometry measure ments performed in different positions on the same object
Summary
The purpose of the project “ELICA” (ELImination of very low-level waste (VLLW) CAbles) is to establish the elimination pathway of VLLW cables towards the French repository. The aim of the present document is to update and qualify new gamma spectrometry efficiency calibration curves for packages filled with mixed cables. It details the influence of the geometry parameters (such as the material composition, density and hotspots) on the values of the efficiency calibration uncertainties related to the ELICA project. This methodology is applicable to other waste elimination campaigns projects.
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