Natural Gamma Emitters after a SelectiveChemical Separation of a TENORM residue:Preliminary Results

摘要

An analytical procedure was established in order to obtain selective fractions containing radiumisotopes (~(228)Ra),thorium(~(232)Th),and rare earths from RETOTER (REsiduo de TOrio e TErrasRaras), a solid residue rich in rare earth elements, thorium isotopes and small amount of naturaluranium generated from the operation of a thorium pilot plant for purification and production ofpure thorium nitrate at IPEN –CNEN/SP. The paper presents preliminary results of ~(228)Ra, ~(226)Ra,~(238)U,~(210)Pb, and ~(40)Kconcentrations in the selective fractions and total residue determined by high-resolution gamma spectroscopy, considering radioactive equilibrium of the samples.