title: Determination of rare earths and thorium in apatites by thermal and epithermal neutron-activation analysis.
abstract: A procedure is described for the non-destructive determination of Na, Mn, La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, Lu and Th in apatites by thermal and epithermal neutron-activation of independent portions of the material. The method was applied to three apatites with different contents. The precision obtained was better than +/-5% for La, Ce, Sm, Eu, Gd, Tb and Dy and +/-20% for Yb, Nd, Ho, Er and Lu for an apatite with a total rare-earth oxide content of the order of 1%. Determination of Ce, Tb and Yb could only be carried out with thermal neutron-activation analysis, while Gd, Ho and Er could only be determined after irradiation with epithermal neutrons.
authors.affiliation: Mineralogical-Geological Museum, University of Oslo, Sargst. 1, Oslo 5, Norway.
authors.forename: A O
authors.initials: AO
authors.lastname: Brunfelt
authors.forename: I
authors.initials: I
authors.lastname: Roelandts