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  • 1 Sophia University Department of Chemistry 7-1 Kioicho, Chiyodaku 102 Tokyo Japan
  • | 2 Musashi Institute of Technology Atomic Energy Research Laboratory 971 Ozenji, Asaoku 215 Kawasakishi, Kanagawa Japan
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Abstract  

Determination of the lanthanoids, thorium and uranium in silicate rocks has been investigated by neutron activation analysis (NAA). Seven or eight lanthanoids and thorium and uranium were determined by non-destructive instrumental NAA. The numbers of the lanthanoids determined were increased and errors on the final values were reduced by pre-irradiation treatments, which included a coprecipitation process with aluminium as collector to remove the alkali metals and halogens and a solvent extraction process to eliminate iron. The necessity of scandium removal was indicated.