ALLAN SANTOS
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Artigo IPEN-doc 27878 Radiological characterization of peloids obtained by maturation with Ćguas de LindĆ³ia, PoƧos de Caldas and PeruĆbe waters2021 - TORRECILHA, J.K.; MARRICHI, J.M.O.; SOUZA, E.A.P.; GOUVEA, P.F.M.; ALVES, I.C.; SANTOS, A.; SILVA, P.S.C.One of the concerns about using mineral clay for therapy treatments is its radioactivity content due to natural radionuclides, normally, associated with the clays. This work proposes to characterize the natural radionuclides of the peloids obtained by the maturation process of mixing two different clays (gray and green) with different mineral medicinal waters from Ćguas de LindĆ³ia (SP), PoƧos de Caldas (MG) and sea water from PeruĆbe (SP). The gamma spectrometry showed that the gray and green bentonite peloids, all the activity concentrations of radionuclides are higher in gray ones, except 40K. The activity concentration varied from 84 to 156 Bq kgā1 (228Ra), 25 to 156 Bq kgā1 (228Th), 9 to 161 Bq kgā1 (226Ra), 39 to 256 Bq kgā1 (210Pb) and 162 to 1070 Bq kgā1 (40K). However, by calculating the absorbed dose rate in the worst scenario, this may not be a problem for topical application. Although the waters from Ćguas de LindĆ³ia and PoƧos de Caldas are considered radioactive they have not caused a significant increase in radionuclide concentrations absorbed dose rate.Artigo IPEN-doc 23041 Radiological hazard indices and elemental composition of Brazilian and Swiss ornamental rocks2017 - HAJJ, T.M.E.; SILVA, P.S.C.; GANDOLLA, M.P.A.; DANTAS, G.A.S.A.; SANTOS, A.; DELBONI JUNIOR, H.The objective of this paper was to evaluate the radiological risk index of ornamental rocks sold both in Brazil and Europe and to correlate its radioactive content with their chemical composition. The 238U, 232Th and 40K mean values were 62 Ā± 65, 122 Ā± 111, 1126 Ā± 516 Bq kg-1 for Brazilian and 93 Ā± 59, 70 Ā± 67 and 1005 Ā± 780 Bq kg-1 for Swiss samples, respectively. The radiological index: radium equivalent, external hazard index, absorbed dose rate in air, annual gonadal equivalent dose, annual effective dose equivalent and excess lifetime cancer risk for Brazilian and Swiss samples were calculated. The main contribution for the radiological indices observed was the radionuclide 232Th, which is associated with REE, Br, Hf, Na, Rb, Sb and Zr in the rock matrix.