RAFAELLA MENEZES AYLLON

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    Artigo IPEN-doc 29849
    Th-232 radiological aspects of carbonate niobium mining waste use as agricultural amendment
    2023 - AYLLON, R.M.; FURLAN, M.R.; EL HAJJ, T.M.; SILVA, P.S.C.
    The use of mining residues in agriculture may be possible, as long as there be previous studies in different areas, one of them being the analysis of the involved radionuclides behavior. This study determined the concentrations of 232Th activity in soil, soil treated with lime, soil with carbonate residue from niobium mining, soil with the mixture of lime and carbonate, in two moments. The transfer factor of 232Th from the soil to the plant was analyzed, in this case, lettuce (n=20), in the different types of treatment and in two moments. The addition of carbonate to the soils did not significantly alter the levels of radioactivity for 232Th radionuclide in lettuce. The effective dose resulting from the lettuce ingestion varied from 0.09 to 0.3 µSv y-1.
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    Artigo IPEN-doc 26214
    External gamma exposure due to the application of carbonate niobium tailing as soil amendment
    2019 - AYLLON, RAFAELLA M.; TORRECILHA, JEFFERSON K.; SAUEIA, CATIA H.R.; NISTI, MARCELO B.; TORQUATO, HENRIQUE; EL HAJJ, THAMMIRIS M.; ZAHN, GUILHERME S.; SILVA, PAULO S.C. da
    The storage of tailing from anthropic activities like mining, which may contain radionuclides, is a problematic situation consequent from NORM industries and for which alternatives should be sought. This paper presents the preliminary results for the use of a carbonate tailing derived from niobium extraction as soil amendment from the point of view of the radiological indices, since this material is a NORM residue. The activity concentration of radionuclides 226Ra, 228Ra and 40K were determined in six samples of carbonate by gamma spectrometry and the radiological hazard indices were calculated for the carbonate itself and simulated for soil application. The results indicated that the dilution of the carbonate in the soil do not increase the radiological hazard indices.