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Article Dans Une Revue Applied Surface Science Année : 2020

Metal decontamination by high repetition rate nanosecond fiber laser: Application to oxidized and Eu-contaminated stainless steel

Résumé

The decommissioning of metallic equipment (pipes, lane surfaces, etc.) contaminated in nuclear installations can consign large amounts of waste to storage and risk workers to radioactive exposure. Here, we study metallic-surface decontamination by laser ablation, which involves ejection and subsequent trapping of surface contamination by subjecting the surface to high-energy laser pulses. We perform laser ablation on oxidized AISI 304L stainless steel samples impregnated with non-radioactive Eu using a high repetition rate nanosecond fiber laser. The oxide layers are with a mean weight percentage of 0.1 to 2% of Eu in the volume of the oxide layer. Glow discharge mass spectrometry (GDMS) is performed to assess the cleaning-treatment efficiency and study the distribution of residual contamination with a Eu-detection limit of 100 ng/g. Our results indicate satisfactory decontamination of up to 97%. We also study the limiting factors and identify the mechanism of penetration of contaminants as induced by thermal effects. Moreover, to understand the ablation mechanism and from the perspective of industrial applications, we analyze the ablated matter to obtain the particle chemical composition and size distributions.
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Dates et versions

hal-03490748 , version 1 (22-08-2022)

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Paternité - Pas d'utilisation commerciale

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L. Carvalho, W. Pacquentin, M. Tabarant, A. Semerok, H. Maskrot. Metal decontamination by high repetition rate nanosecond fiber laser: Application to oxidized and Eu-contaminated stainless steel. Applied Surface Science, 2020, 526, pp.146654. ⟨10.1016/j.apsusc.2020.146654⟩. ⟨hal-03490748⟩
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