Soil is the main source of continuous radiation exposure to humans. It also acts as a medium of migration for transfer of radionuclides to the biological systems and hence, it is the basic indicator of radiological contamination in the environment. In this new book, the authors present current research in the study of the sources, impacts and reduction strategies to radiation exposure. Topics discussed include radiation exposure and protection in conventional pediatric radiology of the thorax; natural and man-made radionuclides in the soil; the current state of terrestrial ecosystems in the Eastern Ural radioactive trace; pharmaceuticals photochemical reactions and radiation exposure in pregnancy and in medical imaging.