1Department of Chemical and Biological Engineering, Hachinohe National College of Technology, Hachinohe, Aomori 039-1192, 2Takasaki Advanced Radiation Research Institute, Japan Atomic Energy Agency, Takasaki, Gunma 370-1292, 3Hachinohe Technical Laboratory, Aomori Industrial Research Center, Hachinohe, Aomori 039-2245, Japan