Abstract
The nondestructive and destructive determinations of copper in zinc materials by neutron activation using 65Cu(n,γ) 66Cu reaction are described. Observed cross-sections of 64Zn(n,p) 64Cu and 66Zn(n,p) 66Cu reactions for fission spectrum neutrons were 28 and 0.51 mb respectively. A double irradiation technique with one sample wrapped in cadmium foil and another bare, was employed for the correction of the concurrent formation of 66Cu by (n,p) reaction. 100 p.p.m. of copper in zinc sulfide was determined nondestructively by γ-ray spectrometry using a thermal flux of 5 · 10 11 n/cm 2/sec, while 0.5 p.p.m. of copper in zinc was determined by a thermal flux of 2.5 · 10 10 n/cm 2/sec, and by a rapid chemical separation involving copper(I) thiocyanate precipitation. The proposed activation procedures were compared with the spectrophotometric dibenzyldithiocarbamate procedure.
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