Which of the following is a source of radiation in the plant?

• A. Office equipment
• B. Ancillary safety equipment
• C. Reactor Fuel
• D. Public communications

Answer: (C)

The main concept is recognizing where radiation comes from inside a nuclear plant. Reactor fuel is the primary source because it contains radioactive materials that emit ionizing radiation, including gamma rays and beta particles, as it releases energy and as fission products decay. Even after fuel is spent, it remains highly radioactive, continuing to produce radiation. In contrast, ordinary office equipment does not emit significant ionizing radiation during normal use, ancillary safety equipment is designed to shield, monitor, and protect rather than emit radiation, and public communications have no radiation emissions. Therefore, reactor fuel is the correct source of radiation in the plant.