2014
DOI: 10.1016/j.jenvrad.2014.01.019
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The influence of particle size on radionuclide activity concentrations in Tejo River sediments

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Cited by 29 publications
(18 citation statements)
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“…The radionuclide content depends on mineralogical features and the chemistry of the sediment. In beach sediments, U and Th may be found incorporated into the existing minerals or they may be adsorbed directly onto clay minerals or organic debris (Madruga et al, 2014). According to Carvalho et al (2011), light minerals such as quartz and feldspar may contain relatively high concentrations of 40 K.…”
Section: Introductionmentioning
confidence: 99%
“…The radionuclide content depends on mineralogical features and the chemistry of the sediment. In beach sediments, U and Th may be found incorporated into the existing minerals or they may be adsorbed directly onto clay minerals or organic debris (Madruga et al, 2014). According to Carvalho et al (2011), light minerals such as quartz and feldspar may contain relatively high concentrations of 40 K.…”
Section: Introductionmentioning
confidence: 99%
“…New challenges have arisen due to global development, especially in the field of environmental protection and conservation (Bennett et al 2003). The mobilization of radionuclides through mining, accidents, spills, explosions, weapon fabrication, testing (Madruga et al 2014), dumping of wastes (Richter 2013) and radioisotopes used in medicines (Frédéric and Yves 2014) has led to the discharge of these elements into the ecosystem. The problem of heavy metal including radionuclide pollution is becoming more and more serious with increasing anthropogenic activities such as industrialization and disturbances of natural biogeochemical cycles (Č erne et al 2010;Fulekar et al 2010;Wuana and Okieimen 2011;Ali et al 2013).…”
Section: Introductionmentioning
confidence: 99%
“…Os radionuclídeos naturais entram na cadeia alimentar pela erosão das margens e leito dos rios, diluindo, assim, os mesmos presentes no solo. Se o rio é usado para captação da água e posterior consumo, então os radionuclídeos diluídos no mesmo acabam sendo ingeridos pelo ser humano (MADRUGA et al, 2014).…”
Section: Introductionunclassified
“…(1) As fontes de radiação terrestre que possuem maior relevância são as de 40 K (T 1/2 = 1,26 x 10 9 anos), de 87 Rb (T 1/2 = 4,8 x 10 10 anos) e de radionuclídeos presentes nas séries de decaimento do 238 (HENRY et al, 1998, COPE, 2008, MADRUGA et al, 2014COELHO, 2008;CHEN et al, 2014).…”
Section: Introductionunclassified
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