Rare earth elements, thorium and uranium in ores of the North- Latium (Italy)

Geraldo Capannesi, Alberto Rosada, Maurizio Manigrasso, Pasquale Avino

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Abstract

In geochemistry, the distribution of the Rare Earth Elements (REEs) in earth crust and mantle allows to understand geochemical cycles and origin and age of igneous rocks. In this article REEs (Ce, Dy, Eu, La, Nd, Sm, Tb, and Yb), Th and U in ores of the North-Latium (Bracciano area, Ceriti Mt., Fate Mt., Sabatini Mt., Vulsini Mt., Acqua Rossa basin), have been investigated for evaluating the extraction feasibility for industrial applications. 107 samples were irradiated in the rotating rack of the TRIGA Mark II reactor of the R.C. Casaccia (ENEA) at neutron flux of 2.6 × 1012 n × cm-2 × s-1 for 12 h together with primary and secondary standards. The gamma spectrometry measurements were performed after 8 h, 3 and 30 days of decay by means of HPGe detector (FWHM 1.75 keV at 1332.5 keV, peak/Compton ratio 55.1, relative efficiency of 22%) connected to a multi-channel analyzer. The total REE mean content is 105 μg g-1, ranging widely between 2.23 and 410.5 μg g-1 (average coefficient of variation 112%). A similar behavior is found for Th and U: their average levels are 13.5 and 6.0 μg g-1, respectively. A quite good correlation between REEs and Th (and U) is found for Ceriti Mt. (r2>0.8) whereas for the other areas the correlation is 0.7. The results obtained evidence the low U content in the investigated locations. © Akadémiai Kiadó, Budapest, Hungary 2011.
Original languageEnglish
Pages (from-to)163 - 168
Number of pages6
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume291
Issue number1
DOIs
Publication statusPublished - Jan 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Nuclear Energy and Engineering
  • Radiology Nuclear Medicine and imaging
  • Pollution
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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