His research field is environmental radioactivity relevant to radiation protection. His interests are environmental monitoring, radiation measurement techniques especially extremely-low radioactivity counting and radiation shielding. Now, he is trying to do research on quantitative procedure of activity of activated concrete which was used for shielding material at nuclear/radiation facility. Accurate estimation of such activated material is very important and is of advantage in the stage of dismantling of nuclear/radiation facility in order to examine amount of radioactive waste carefully.