Eiliv Steinnes J.J. Rowe 1977 <p>Epithermal neutron-activation analyses results of the 8 new USGS standard rocks are compared with results by spectrographic, X-ray fluorimetric, atomic absorption, radiochemical neutron-activation, instrumental neutron-activation (thermal neutrons), isotope-dilution mass spectrometric, spectrofluorimetric, radioisotopic dilution and delayed-neutron techniques for 22 elements. Results indicate the technique to be useful and dependable especially for Ni, Se, Rb, Sr, Mo, Ba, Tm, Ta, Th and U.</p> application/pdf en U. S. Geological Survey Determination of 22 minor and trace elements in 8 new USGS standard rocks by instrumental activation analysis with epithermal neutrons article