Nuclear energy and radiation terminology · MLC-0119
Nuclear energy and radiation terms: D (34)
- Daughter productsIsotopes that are formed by the radioactive decay of some other isotope. In the case of radium-226, for...
- Decay heatThe heat produced by the decay of radioactive fission products after a reactor has been shut down.
- Decay, radioactiveThe spontaneous transformation of one radioisotope into one or more different isotopes (known as “decay...
- Declared pregnant womanA woman who is an occupational radiation worker and has voluntarily informed her employer, in writing, of her...
- DecommissioningThe process of safely closing a nuclear power plant (or other facility where nuclear materials are handled)...
- DECONA phase of reactor decommissioning in which structures, systems, and components that contain radioactive...
- DecontaminationA process used to reduce, remove, or neutralize radiological or chemical contamination to reduce the risk of...
- Deep-Dose EquivalentThe external whole-body exposuredose equivalent at a tissue depth of 1 cm (1000 mg/cm^2). For further...
- Defense in depthAn approach to designing and operating nuclear facilities that prevents and mitigates accidents that release...
- Departure from nucleate boilingThe point at which the heat transfer from a fuel rod rapidly decreases due to the insulating effect of a...
- Departure from nucleate boiling ratioThe ratio of the heat flux needed to cause departure from nucleate boiling to the actual local heat flux of a...
- Depleted uraniumUranium with a percentage of uranium-235 lower than the 0.7 percent (by mass) contained in natural uranium...
- Derived air concentrationThe concentration of a given radionuclide in air which, if breathed by the reference man for a working year...
- Derived Air Concentration-HourThe product of the concentration of radioactive material in air (expressed as a fraction or multiple of the...
- Design certificationCertification and approval by the NRC of a standard nuclear power plant design independent of a specific site...
- Design-basis accidentA postulated accident that a nuclear facility must be designed and built to withstand without loss to the...
- Design-basis phenomenaEarthquakes, tornadoes, hurricanes, floods, etc., that a nuclear facility must be designed and built to...
- Design-basis threatA description of the type, composition, and capabilities of an adversary, against which a security system is...
- DetectorA material or device that is sensitive to ionizing radiation and can display its characteristics and/or...
- Deterministic effectThe health effects of radiation, the severity of which varies with the dose and for which a threshold is...
- Deterministic (probabilistic)Consistent with the principles of "determinism," which hold that specific causes completely and certainly...
- DeuteriumAn isotope of hydrogen with one proton and one neutron in the nucleus.
- DeuteronThe nucleus of deuterium. It contains one proton and one neutron. See also Heavy water (D2O).
- Differential pressure (dp or dP)The difference in pressure between two points of a system, such as between the inlet and outlet of a pump.
- Doppler coefficientAnother name used for the "fuel temperature coefficient of reactivity," or the change in reactivity per...
- Dose, absorbedThe amount of energy absorbed by an object or person per unit mass. Known as the “absorbed dose,” this...
- Dose equivalentA measure of the biological damage to living tissue as a result of radiation exposure. Also known as the "...
- Dose (radiation)The National Council on Radiation Protection and Measurements estimates that an average person in the United...
- Dose rateThe dose of ionizing radiation delivered per unit time. For example, rems or sieverts (Sv) per hour.
- DosimeterA small portable instrument (such as a film badge, thermoluminescent dosimeter, or pocket dosimeter) used to...
- DosimetryThe theory and application of the principles and techniques involved in measuring and recording doses of...
- Drop-In MeetingsNon-public meetings with NRC senior managers, requested by external stakeholders for general exchanges of...
- Dry cask storageA method for storing spent nuclear fuel in special containers known as casks. After fuel has been cooled in a...
- DrywellThe containment structure enclosing the vessel and recirculation system of a boiling-water reactor. The...
34 of 555 terms in Nuclear energy and radiation terminology (MLC-0119). Request the full dataset.