Radiochemical Neutron Activation Analysis (RNAA) for gold determination in sulfide ores was studied. The sample was ignited in a porcelain for one hour at 600o C and dissolved then with aqua regia. The gold was absorbed on an ion exchange resin AG 1 × 8 in medium 1N HCl. The resin sample was then irradiation in Da Lat nuclear reactor with neutron flux about × 1012 n/cm2 s. The radioactivity of gold was measured by Au-198 isotope on a detector GeHP connected Multichannel analyser (MCA) and PC pentum 586.
