NEUTRON-ACTIVATION ANALYSIS INVESTIGATIONS IN UPDATING REE COMPOSITION OF GABBRO GOG-1 REFERENCE SAMPLE - A COMPARISON WITH SIMS AND ICP-AES DATA

An updated REE measurement of gabbro GOG-1 was carried out by means of neutron activation analyis (NAA). The availability of high amount so frock powder allowed the sample to be well ground and homogenized before analysis. Homogeneity tests, carried out on different aliquots, show that GOG-1 samples can be considered homogeneous when over 50 mg aliquots of rock powder are employed for analytical work. Results from ICP-AES and SIMS investigations of REE in gabbro GOG- 1 are in quite good agreement with NAA data and support the possibility of employing GOG-1 rock samples as reference material for geoanalysis.