This is Book of Abstracts for the 35th IARP National Conference on "Radiation Protection for Sustainable Nuclear Energy: Adapting to Climate and Technological Changes" jointly organized by IARP, the Centre for Advanced Research in Environmental Radioactivity (CARER), and the Centre for Application of Radioisotopes and Radiation Technology (CARRT) being held during January 29-31, 2025 at Mangalore University, Mangalagangothri, Karnataka. This conference aims to address the challenges and opportunities in the field of radiation protection amidst evolving climate and technological landscapes. This includes abstracts of contributory papers presented in the conference covering a broad range of thematic areas, including• Radiation Protection in Emerging Nuclear Technologies• Radiation Safety and Protection in Nuclear Fuel Cycle Facilities• Radiation Safety and Protection in Accelerators, Medical, Industrial, and Other Sectors• Radiation Dosimetry• Nuclear Instrumentation and System Development• Environmental Monitoring and Assessment, including radioisotope applications for climate change and atmospheric studies• Radiation Protection Philosophy, Risk Estimates, Regulatory Framework, Systems of Protection, Standards, and Regulation• Existing Exposures