| IAEA: International Atomic Energy Agency. IAEA Certificate/Certificate of Competent Authority/Special Form Certificate: A certificate that confirms the manufacture and encapsulation of radioactive material into an impervious container. See: Sealed Source. Irradiation: Exposure to radiation. Ingestion: Swallowing radionuclides by eating or drinking. Inhalation: Breathing in radionuclides. Internal exposure: An exposure received from a source of ionizing radiation inside of the body. Inverse Square Law: The relationship that states that electromagnetic radiation intensity is inversely proportional to the square of the distance from a point source. In other words, roughly speaking, as you double your distance from a radioactive source your exposure is reduced to ¼. Ion: A charged atom or particle. An atom that has fewer or more electrons than protons. Nuclear radiation can cause ionization. Ionization: A process in which an atom loses or gains one or more electrons thereby forming an ion. Ionizing radiation: Radiation that is sufficiently energetic to ionize the matter (remove electrons from the atoms thereby producing ions) through which it moves. Alpha, beta, gamma and neutron are all forms of ionizing radiation. Irradiation: Exposure to radiation. Isotope: A variation of a element with the same number of protons, but different number of neutrons. | 
