WAGNER STIPP DE SOUZA
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Artigo IPEN-doc 29897 Surface contaminants’ incorporation after nanosecond laser ablation2023 - STIPP, WAGNER; MORAIS, NATHANAEL W.S.; MARTINS, JOSÉ V.; MATOS, PRISCILA; ROSSI, JESUALDO L.; ROSSI, WAGNER de; RAELLE, MARCUS P.Decontamination and cleaning of surface-contaminated radioactive waste using laser ablation is a promising new technique being researched. One advantage is the potential to recycle waste and reduce the demand for repository storage. However, prior studies have shown that residual radioactivity can persist after laser decontamination indicating the incorporation of contaminants beneath the surface of metal samples. In this study, a q-switched laser was used to measure the depth of the recast zone at various fluences and simulate a decontamination process using a gold-coated sample. The results showed that surface material was found in the recast zone for fluences ranging from 1 to 10 J/cm2. This suggests that incorporation of surface contaminants after laser ablation is an important issue that must be considered before using this technique for radioactive waste treatment.Artigo IPEN-doc 29363 Study on the potential of laser ablation to decontaminate radioactive waste2022 - COSTA, PRISCILA; STIPP, WAGNER; VICENTE, ROBERTO; MACHADO, NOE G.P.; RAELE, MARCUS P.Laser is a promising tool to decontaminate radioactive waste that is impregnated with radionuclides on its surface, the decontamination process has no chemical inputs, and the pollutants can be fixed in HEPA filters. The current study aimed to test a wide range of samples using 10 different materials and fluences ranging from 1 to 10 J/cm2.