Randomized trial investigates activity localization in metallic waste, suggesting improved decontamination methods.
The Compton scattering phenomenon was investigated with the aim of characterizing metallic waste from decommissioning. The distinction and quantification of activity located on the surface or within the volume of steel samples and their concurrent determination can be achieved by using the photo-peak and the Compton-edge counts from experimental and Monte Carlo N-Particle (MCNP) simulated spectra. Two gamma-ray detectors were evaluated: a High-Purity Germanium (HPGe) and a Cerium Bromide (CeBr 3 ) scintillator detector. Simulated and experimental spectra of radioactive sources in steel were analysed. The Compton-to-photo-peak ratio (C/P) was determined for varying steel shielding thicknesses between the source and detector. Activity quantification and discrimination between surface and volume activity were demonstrated using the C/P versus the absolute photo-peak efficiency plot. The activity at the surface and within the volume in 1-mm-thick carbon steel slab arrays, with 137 Cs filter paper sources placed between the slabs and on the arrays, were validated through gamma-spectrometry measurements and simulations. Two methodologies based on photo-peak and Compton-edge analysis were employed. This study demonstrates that the localization and the concurrent quantification of both activities in metallic waste is feasible, enabling a more accurate evaluation of scaling factors and thereby an improved selection of decontamination and clearance procedures.
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Markopoulos et al. (2026) studied this question.
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