Chapter 1: Radiation biology: historical background, sources and complications -- Chapter 2: Algal radioprotective phytochemicals: Sources and potential applications -- Chapter 3: Bio-prospecting of photoprotective compounds in algae -- Chapter 4: Unraveling fungal radioprotectants and their applications -- Chapter 5: Recent advances in metabolomics and molecular genomics for the production of photoprotective compounds -- Chapter 6: Bioprospecting and evolutionary significance of radioprotectors in non-flowering lower plants -- Chapter 7: Radioprotective phytochemicals: diversity, efficacy, application and commercialization -- Chapter 8: Impacts of climate alterations in the biosynthesis of defensive natural products -- Chapter 9: Cancer therapeutics: mechanism of action, radiation toxicity and drug formulation -- Chapter 10: Role of nanotechnology in the development of radioprotective formulations -- Chapter 11: Radioprotective effects of nutraceuticals and food products -- Chapter 12: Bioprospecting of radioprotective compounds in bacterial community -- Chapter 13: Pharmacology of synthetic and natural radioprotactants: application and consequences in cancer therapeutics -- Chapter 14: Immunochemistry: consequences and mechanism of protection in chemotherapeutics -- Chapter 15: Radioprootective therapeutics: recent trends and future applications.