Nuclear energy and radiation terminology · MLC-0119

Nuclear energy and radiation terms: H (20)

• Half-lifeThe time in which one half of the atoms of a particular radioactive substance disintegrate into another...
• Half-life, biologicalThe time required for the body to eliminate one half of the material taken in by natural biological means.
• Half-life, effectiveThe time required for the activity of a particular radioisotope deposited in a living organism, such as a...
• Half-life (radiological)The time required for half the atoms of a particular radioisotope to decay into another isotope. A specific...
• Half-thicknessAny given absorber that will reduce the intensity of an original beam of ionizing radiation to one-half of...
• Head, reactor vesselThe removable top section of a reactor pressure vessel. It is bolted in place during power operation and...
• Health physicsThe science concerned with recognizing and evaluating the effects of ionizing radiation on the health and...
• Heap leach recovery processA method for extracting uranium from ore. The ore is placed in piles or heaps on top of liners. The liners...
• Heat exchangerAny device that transfers heat from one fluid (liquid or gas) to another fluid or to the environment.
• Heat sinkAnything that absorbs heat. It is usually part of the environment, such as the air, a river, or a lake.
• HeatupThe rise in temperature of the reactor fuel rods resulting from an increase in the rate of fission in the...
• Heavy waterWater containing significantly more than the natural proportions (one in 6,500) of heavy hydrogen (deuterium...
• Heavy water moderated reactorA reactor that uses heavy water as its moderator. Heavy water is an excellent moderator and thus permits the...
• High radiation areaAny area with dose rates greater than 100 millirems (1 millisievert) in one hour 30 centimeters from the...
• High-enriched uraniumUranium enriched to at least 20 percent uranium-235 (a higher concentration than exists in natural uranium...
• High-level radioactive wasteThe highly radioactive materials produced as byproducts of fuel reprocessing or of the reactions that occur...
• High-level wasteThe highly radioactive materials produced as byproducts of fuel reprocessing or of the reactions that occur...
• Highly (or High-) enriched uraniumUranium enriched to at least 20 percent uranium-235 (a higher concentration than exists in natural uranium...
• HotA colloquial term meaning highly radioactive.
• Hot spotThe region in a radiation/contamination area where the level of radiation/contamination is significantly...

20 of 555 terms in Nuclear energy and radiation terminology (MLC-0119). Request the full dataset.