The book of Jiri Hala and James Navratil is devoted to the basic issues of radiochemistry and nuclear chemistry - - the fundamental properties of nuclear radiation, the phenomenon of radioactivity and the kinetics of radioactive decay, nuclear reactions, the use of radionuclides and sources of ionizing radiation in science and industry, in particular the basics of nuclear energy, as well as the dosimetry of ionizing radiation and the behavior of radionuclides in the environment.