DETERMINATION OF IMPURITIES IN TITANIUM AND TITANIUM DIOXIDE BY NEUTRON ACTIVATION ANALYSIS .4. DETERMINATION OF TRACE IMPURITIES IN TITANIUM DIOXIDE SINGLE CRYSTALS

The method is based on reactor irradiation and Ge(Li) spectrometry. An anionexchange separation, followed by TBP solvent extractions, allows a rapid and accurate determination of up to 21 metallic impurities in titanium dioxide crystals. Of the elements investigated, only hafnium and protactinium, radioactive daughter of thorium, stayed with the matrix activity and hence could not be determined. Triplicate determinations were performed of three different samples. The sensitivity ranged from 10-12 g for iridium, to 10-7 g for barium, for reactor irradiation at a thermal neutron flux of 5·1012 n cm-2 sec-1 during one week. © 1969.