This book discusses conventional and emerging applications of radiations, which include radio waves and ultraviolet and gamma radiations. It contains 10 chapters arranged into two parts: new techniques in radiation therapy and effects of ionizing radiations on biological systems. The applications of radiations in the synthesis and use of nanoparticles along with combined effects with hypergravity provide an added dimension. The book offers a concise account of the latest studies carried out so far and shows the new initiatives to be undertaken in the field of medicine and biology. The medical use of radiations includes FBX dosimetry, Co-60 tomotherapy, radio-electro-chemotherapy, and fractional radiotherapy. Radiobiological effects include effects of cell phone radiations on human health parameters and combined effects of radiations and hypergravity on plants. These aspects are covered in the book.