| Natural background radiation: Radiation that exists naturally in the environment. It includes cosmic and solar radiation, radiation radioactive materials present in rocks and soil, and radioactivity that is inhaled or ingested. Neutron: Neutral sub-atomic particle located in the nucleus of an atom/element. Non-Agreement State: A state under the direct rules and regulations of the NRC. Nondestructive testing: Testing that does not destroy the object under examination. Non-ionizing radiation: Having lower energy and longer wavelengths than ionizing radiation it is not strong enough to affect the structure of atoms, but it is strong enough to heat tissue and cause harmful biological effects. Examples are radio waves, microwaves, visible light and infrared. Notice to Employees Poster: A required information poster that must be available/posted for all employees of a company using gauges. This poster can be obtained from the licensing agency. NRC: Nuclear Regulatory Commission. Federal licensing and regulatory body that oversees the use of radioactive materials in the United States. Nuclear energy: The heat energy produced by the process of nuclear fission within a nuclear reactor or by radioactive decay. Nuclear reactor: A device in which a controlled , self-sustaining nuclear chain reaction can be maintained with the use of cooling to remove generated heat. Nucleus: The central part of an atom that contains the neutrons and protons. The nucleus is the heaviest part of the atom. | 
