The document discusses the internal and external hazards of radiation. It explains that internal exposure occurs when radionuclides enter the body through inhalation, ingestion, or wounds. External contamination can occur when radioactive material deposits on the skin or clothes. Radiation damage depends on the absorbed dose and type of radiation. External exposure happens when the body is exposed to radiation from an external source. Internal exposure results from incorporation of radioactive materials into the body. The document provides details on internal and external radiation hazards and how exposure can be limited through distance, shielding, and containment.