REGINA BECK TICIANELLI
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Capítulo IPEN-doc 28703 Análise dos radionuclídeos encontrados na água do reator IEA-R12022 - ZAHN, GUILHERME S.; TICIANELLI, REGINA B.; SILVA, PAULO S.C. da; GENEZINI, FREDERICO A.O reator IEA-R1 é do tipo piscina aberta, construído nos anos 1950. Nos últimos anos, ele opera a 4,5MW por oito horas às segundas, terças e quartas. Em todo dia de operação, duas amostras da água do reator são retiradas, uma antes de o reator ser ligado pela manhã e outra em torno das 16h, próximo ao final as operação. Essas amostras são contadas em um detector HPGe por 1500 s para verificar possíveis problemas com os elementos combustíveis, entre outros. Neste trabalho, os resultados obtidos nessas análises ao longo de alguns meses de 2019 são discutidos em termos dos radionuclídeos encontrados, bem como da dependência da sua atividade com o tempo.Artigo IPEN-doc 28347 Multi-element contamination in soils from major mining areas in Northeastern of Brazil2021 - MONTALVAN-OLIVARES, D.M.; SANTANA, C.S.; VELASCO, F.G.; LUZARDO, F.H.M.; ANDRADE, S.F.R.; TICIANELLI, R.B.; ARMELIN, M.J.A.; GENEZINI, F.A.Mining has become one of the main factors in the global biogeochemical cycle of potentially toxic elements. Therefore, it is considered one of the anthropogenic activities with the greatest negative impact on the environment. These impacts are maximized in semiarid regions, where mining activities can lead to soil degradation and decrease in land productivity. This study aimed to assess the level of contamination in natural, urban, and agricultural soils of three important mining areas, where approximately 80,000 people live, and pollution levels have never been determined before. For this purpose, soil samples were collected around iron, uranium, and vanadium mines, as well as in the main human settlements of the region. The concentrations of 34 elements were determined by instrumental neutron analysis activation (INAA) and inductively coupled plasma optical emission spectrometry (ICP OES) techniques. Pollution indices (CF, EF, mCd, PLI, and REEP) revealed that there is a moderate to heavy level of pollution for 89% of the analyzed elements. Additionally, an extreme contamination level was observed in 78% of the samples, for at least one element. Statistical analyses were performed to identify patterns in the distribution and common sources of pollution. The results suggest that the concentrations for Al, Ba, Hf, Na, Pb, Rb, REE, Ta, Th, U, Zn, and Zr are associated with geogenic causes. However, the influence of anthropogenic sources such as agriculture and mining on the accumulation of these elements in soils should not be disregarded. In contrast, the contents of As, Br, Cd, Co, Cr, Cs, Cu, Fe, K, Mn, Ni, Sc, Ti, and V reflect the direct impact of anthropogenic sources.