Radiation protection

Radiation protection comprises principles and practices for limiting harmful exposure to ionizing radiation. It balances exposure reduction against the benefits of activities that use radiation.

Ionizing radiation: Radiation energetic enough to remove electrons from atoms or molecules. Protection principles address radiation capable of producing ionization in tissue.
Radiation dosimetry: The measurement and calculation of radiation dose in matter and living tissue. Protection depends on quantifying exposure and dose.
Radiation worker: A person whose work involves potential occupational exposure to ionizing radiation. Workplace protection applies dose monitoring and exposure controls to this group.
Radiation safety: The broader practice of controlling hazards from radiation sources, including exposure, contamination, and operational risks. It overlaps with protection but also covers hazards beyond limiting dose.
International Commission on Radiological Protection: An independent organization that develops recommendations on radiological protection. Its recommendations have shaped many national protection systems.
Absorbed dose: The energy deposited by ionizing radiation per unit mass, measured in grays. It quantifies energy transferred to exposed material.
Linear energy transfer: The energy an ionizing particle transfers to a material per unit distance traveled. Energy deposition patterns help explain why radiation types differ biologically.
Medical radiation protection: Practices that limit unnecessary exposure during diagnostic imaging and radiation therapy while preserving clinical benefit. Medical use requires balancing patient benefit against avoidable exposure.
Radiation contamination: The unwanted presence of radioactive material on or within people, objects, or places. Contamination is a hazard requiring controls distinct from external irradiation.
X-ray: A form of electromagnetic radiation capable of penetrating matter and ionizing atoms. Its discovery initiated widespread medical and industrial radiation use—and the need for protection.

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