The triple comparator method is used for the analysis of impurities of high purity silicon by neutron activation. The ratios
of the specific photopeak activities of the isotopes investigated to the specific photopeak activities of the gold, indium
and cobalt comparators were determined. The triple comparator method avoids some tedious problems in the multi-element activation
analysis and it is very well suited for the determination of ‘non-expected’ elements.