This course introduces students to the knowledge required in the field of science and technology. The topics discussed are Radioactivity: Structural of Nucleus, Natural radioactivity, Types of radiation, Decay process, Transformation Kinetics. Radiation Matter Interaction: Nature of matter, Nuclear radiations, Nuclear reactions, Transformation mechanism. Dosimetry Radiation: Exposure, Radiation effects, Basic internal biological dosimetry, Unit of radiation dose Biological Effects Against Radiation: Dose Response feature, Radiation effects, Basic internal biological dosimetry, Unit of radiation dose. Radiation Safety Guide: Basic principal of radiation protection, principles for reducing radiation exposure, Aspects of shielding in diagnostic radiology, The regulatory bodies. Health Physics Instrumentation: Radiation detectors, Dose measurement instrumentation, Newer radiation detection devices. Radiation Protection: External radiation protector, Internal radiation protector, Critical radiation protector.