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Due to a lapse in appropriations, the NRC has ceased normal operations. However, excepted and exempted activities necessary to maintain critical health and safety functions—as well as essential progress on designated critical activities, including those specified in Executive Order 14300—will continue, consistent with the OMB-Approved NRC Lapse Plan.

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Radiation therapy (radiotherapy)

Radiation therapy (radiotherapy) … The therapeutic use of ionizing radiation to treat disease in patients. Although most radiotherapy procedures are intended to kill cancerous tissue or reduce the size of a tumor, therapeutic doses may also be used to …

Annual limit on intake (ALI)

Annual limit on intake (ALI) … As defined in Title 10, Section 20.1003, of the Code of Federal Regulations ( 10 CFR 20.1003 ), ALI is the derived limit for the amount of radioactive material taken into the body of an adult worker by inhalation or …

Gap

Gap … The space inside a reactor fuel rod that exists between the fuel pellet and the fuel rod cladding . … Gap …

Electron

Electron … An elementary particle with a negative charge and a mass 1/1837 that of a proton . Electrons surround the positively charged nucleus of an atom , and determine its chemical properties. … …

Gauging devices

Gauging devices … Devices used to measure, monitor, and control the thickness of sheet metal, textiles, paper napkins, newspaper, plastics, photographic film, and other products as they are manufactured. Gauges mounted in fixed locations are designed for …

Flux

Flux … A term applied to the amount of some type of particle ( neutrons , alpha particles , etc.) or energy ( photons , heat, etc.) crossing a unit area per unit time. The unit of flux is the number of particles, energy, etc., per square centimeter per …

Transient

Transient … A change in the reactor coolant system temperature, pressure, or both, attributed to a change in the reactor’s power output. Transients can be caused by (1) adding or removing neutron poisons , (2) increasing or decreasing electrical load on …

Counter

Counter … A general designation applied to radiation detection instruments or survey meters that detect and measure radiation. The signal that announces an ionization event is called a count. For related information, see Detecting Radiation . … …

Drywell

Drywell … The containment structure enclosing the vessel and recirculation system of a boiling-water reacto r. The drywell provides both a pressure suppression system and a fission product barrier under accident conditions. For related information, see …

ENTOMB

ENTOMB … A method of decommissioning , in which radioactive contaminants are encased in a structurally long-lived material, such as concrete. The entombed structure is maintained and surveillance is continued until the entombed radioactive waste decays to …