1. Faculty of Chemical Technology and Engineering, University of Technology and Life Sciences, Seminaryjna 3, 85-326 Bydgoszcz, Poland
2. Institute of Physics, Kazimierz Wielki University, Powstańców Wielkopolskich 2, 85-090 Bydgoszcz, Poland
3. Medical Physics Department, Oncology Center, I. Romanowskiej 2, 85-796 Bydgoszcz, Poland
4. Faculty of Technical Physics, Poznań University of Technology, Piotrowo 3, 60-965 Poznań, Poland