1. Institute of Physics, Jan Kochanowski University, Kielce, Poland;
2. Holy Cross Cancer Center, Kielce, Poland;
3. National Centre for Nuclear Research, Otwock, Poland;
4. Department of Molecular Bioscience, Centre for Radiation Protection Research, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden;
5. Institute of Biology, Jan Kochanowski University, Kielce, Poland