1. Department of Physics and Biophysics, University of Warmia and Mazury, Oczapowskiego 4, 10-719 Olsztyn, Poland
2. Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland
3. Department of Oncology, Medical Physics Division, 3-12 University Terrace, 8303-112 St NW, Edmonton, Alberta T6G 2T4, Canada
4. Department of Chemistry, Chinese Culture University, 55, Hwa-Kang Road, Yang-Ming-Shan, Taipei 11114, Taiwan