PROMPT GAMMA-RAY ANALYSIS USING COLD AND THERMAL GUIDED NEUTRON BEAMS

A permanent and stand-alone neutron-induced prompt gamma-ray analysis (PGA) system, usable at both cold and thermal neutron beam guides of J RR-3M has been constructed. The characteristics of the system, includi ng neutron beam and gamma-ray spectrometer were measured. Owing to the absence of fast neutrons and the low gamma-ray background, analytical sensitivities and detection limits better than those in other PGA sys tems have been achieved. Analytical results of ten elements in Standar d Reference Material of Coal Ny Ash agreed well with those obtained by other methods. Isotopic analysis of Ni and its application to accurat e and precise determination of Ni by stable isotope dilution method we re performed.