Combined procedure using radiochemical separation of plutonium, americium and uranium radionuclides for alpha-spectrometry

Radiochemical Separation of Nickel for 59Ni and 63Ni Activity Determination in Nuclear Waste Samples

“…In this work was developed a sensitive method for sequential analyses of the radionuclides in samples of radioactive waste. The samples analyzed were evaporator concentrate, resin and filter originated from Brazilian Nuclear Power Plants located at Angra dos Reis city (Reis et al, 2011).…”

“…Thus we established the procedure for sequential separation of Pu, Am, Sr (Reis et al, 2011) in which we also included one step that is the hydroxide precipitation to separate U and Fe from Ni because Ni remains in solution in the co-precipitation of U and Fe.…”

“…Between them is the 59 Ni and 63 Ni determination in low and intermediate level wastes from Brazilian Nuclear Power PlantsEletrobrás Termonuclear according to an analytical protocol developed based on sequential separation of different radionuclides presents in the waste matrices (Reis et al, 2011). Sources for 59 Ni are austenitic steel in the reactor and activation of nickel dissolved in the coolant and in corrosion particles deposited on the core.…”

Comparative study of different analytical methods for the determination of 238U, 234U, 235U, 230Th and 232Th in NORM samples (Southern Catalonia)

“…More recently, alternative procedures that simplify the digestion processes have been introduced, such as the use of microwave digestion (MW) or fusion digestion (Mihai, 2005;Michel et al, 2008;Singhal et al, 2010). After the sample digestion, there are different alternatives for the radiochemical separation of the different radioisotopes (Eikenberg et al, 2009;Palomo et al, 2010;Reis et al, 2011). The most widely used methodologies are based on the use of liquideliquid extraction (LLE) and, in the case of uranium and thorium separation, one of the most commonly used strategies is performing the extraction with tri-n-butyl phosphate (TBP) and xylene and then a purification process by using an ionexchange material (Kiliari and Pashalidis, 2010;Lozano et al, 2010;Palomo et al, 2010).…”

Utilização de métodos radioanalíticos para a determinação de isótopos de urânio, netúnio, plutônio, amerício e cúrio em rejeitos radioativos

“…A literatura apresenta diversos estudos sobre métodos de separação radioquímicos sequenciais para determinação dos isótopos de U, Np, Pu, Am e Cm, em matrizes como, solo, água, sedimento, vegetação, resíduo sólido analítico, material biológico e rejeito radioativo (Gascón et al, 1994;Moreno et al, 1997;Michel et al, 1999;Mellado et al, 2001;Tolgyesi et al, 2002;Chen et al, 2002;Ageyev et al, 2005;Lee et al, 2005;Tavcar e Benedik, 2005;Tavcar et al, 2007;Lee et al, 2007;Payne et al, 2008;Maxwell, 2008;Salminen, 2009;Vajda e Kim, 2010;Kastner et al, 2010;Reis Jr. et al, 2010;Pulhani et al, 2011;Murali et al, 2011;Adya et al, 2012;Maxwell et al, 2012;Grahek e Nodilo, 2012;Dulanská et al, 2012ae Dulanská et al, 2012b …”