NEUTRON AND PHOTON-ACTIVATION ANALYSES OF 24 GSJ AND 6 KIER ROCK REFERENCE SAMPLES

Fifteen GSJ (Geological Survey of Japan) and sir KIER (Korean Institut e of Energy and Resources; now Korean Institute of Geology, Mining and Materials, KIGAM) ''igneous rock series'' and nine GSJ ''sedimentary rock series'' reference samples were analysed for 21-29 elements by ne utron and/or photon activation analysis (NAA and PAA); 14 MeV-NAA for Si and Al,fission track method for U, radiochemical and instrumental N AA for rare earth elements, with reactor neutrons for the latter two. Instrumental neutron and photon AA for the remaining elements were per formed with reactor neutrons and bremsstrahlung of end-point energy of 30 MeV, respectively. The reactor irradiations were performed at core sites and also a thermal column of the Kyoto University Research Reac tor. AU of the radioassays were performed by gamma-ray spectrometry wi th HPGe-detectors. The present results from the different types of irr adiation are compared and discussed in terms of elemental abundances a nd rock types.