[en] Summaries of 46 joint studies made at the Research Reactor Institute, Kyoto University, are presented. The reports cover measurement of mineral age by fission track methods; redistribution of arsenic atoms double implanted into silicon during annealing; chemical behavior of trace elements in river water; Neutron diffraction by NdCo₂Si₂ single crystal; concentration of trace elements in grass; high pressure neutron diffraction by magnetic structure of Er; photo-excited quasiequilibrium state in radiation defects; radiation damage effect in alkali silver halide crystals; ductility loss in neutron-irradiated copper alloys; organs and subcellular distribution of transition elements in animals; neutron diffraction by BaTiO₃; new structural behavior of SrTiO₃ at low temperature; neutron diffraction by CeZn₂ single crystal; γ - γ perturbed angular correlation study of Kondo effect; behavior of low-cycle fatigue for neutron-irradiated metal; chemical form and mobility of trace elements in trees; trace characterization of paddy-soil by rice husk analysis; fission fragment damage in magnetic uranium compounds; study on short-lived fission products with KUR-ISOL; study of film sensitivity using autoradiography techniques; neutron transmutation doping on compound semiconductor; geographical study by neutron activation analysis on precipitates in atmosphere and hydrosphere; etc. (Nogami, K.)