Ionizing or non-ionizing radiation

  Choose any biological, chemical or physical agent (physical agent being a source of ionizing or non-ionizing radiation) which presents an environmental hazard, directly or indirectly, to humans. You must describe what the Page 5 of 6 agent is, the nature of the risk (e.g., exposure effects), how it moves through the environment before reaching a target host (e.g., soil, groundwater, food chain, human), and how it moves (and possibly changes) within the body following entry. Include hazard source(s) and recommendations for control measures.