Radiation Safety — DU Skill Enhancement Courses Previous Year Question Papers

SEC-Radiation Safety B.Sc. (H)/ B.Sc. (Prog.) - UGCF-NEP (SHC) 2. Attempt FOUR questions in all. a. A teacher iises a thin sheet of paper, an aluminum sheet and a thick block of lead to identify radiation types. Which radiation is stopped by which material and why? b. c. d. What are the primary methods for reducing exposure from unsealed sources? Why are ferromagnetic materials banned in an MRI room? 3. a. A radioactive nuclide has a half life of20.0 y. What fraction of an initially pure sample of tliis nuclide will remain undecayed at the end of: b. Describe any two ways to protect radiation workers from radiation hazards. How can radiation exposure be monitored. (4) 4. a. Sketoh the operational curve of a Geiger Muller counter. Describe its working with special emphasis to quenching (4) b. What is the role of a photomultiplier tube in a scintillal.or detector? Describe its working. (4) 5. a. Elucidate the basic physical mechanism used in CT in aging OR PET scanning. (4) b. Mention and elaborate any two industrial uses of radiation. (4)