Skip to main content

Alert

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.

Filter Search Results

Image

Search Results

Displaying 31 - 40 of 740

Radiation (ionizing radiation)

Radiation (ionizing radiation) … Alpha particles , beta particles , gamma rays , x-rays , neutrons , high-speed electrons , high-speed protons , and other particles capable of producing ions . Radiation, as used in 10 CFR Part 20 , does not include …

Dosimeter

Dosimeter … A small portable instrument (such as a film badge , thermoluminescent dosimeter , or pocket dosimeter ) used to measure and record the total accumulated personal dose of ionizing radiation . For additional information, see Detecting Radiation …

Byproduct material

Byproduct material … As defined by NRC regulations includes any radioactive material (except enriched uranium or plutonium ) produced by a nuclear reactor . It also includes the tailings or wastes produced by the extraction or concentration of uranium or …

Nuclear waste

Nuclear waste … A subset of radioactive waste that includes unusable byproducts produced during the various stages of the nuclear fuel cycle , including recovery (or extraction), conversion , and enrichment of uranium ; fuel fabrication ; and use of the …

Reactor core

Reactor core … The central portion of a nuclear reactor , which contains the fuel assemblies , moderator , neutron poisons , control rods , and support structures. The reactor core is where fission takes place. … Reactor …

Doppler coefficient

Doppler coefficient … Another name used for the "fuel temperature coefficient of reactivity," or the change in reactivity per degree of change in the temperature of nuclear fuel . The physical property of fuel pellet material (uranium-238) that causes the …

Isotope

Isotope … Two or more forms (or atomic configurations) of a given element that have identical atomic numbers (the same number of protons in their nuclei ) and the same or very similar chemical properties but different atomic masses (different numbers of …

Half-life (radiological)

Half-life (radiological) … The time required for half the atoms of a particular radioisotope to decay into another isotope . A specific half-life is a characteristic property of each radioisotope. Measured half-lives range from millionths of a second to …

Occupational Dose

Occupational Dose … The internal and external dose of ionizing radiation received by workers in the course of employment in such areas as fuel cycle facilities , industrial radiography , nuclear medicine , and nuclear power plants . These workers are …

Deuterium

Deuterium … An isotope of hydrogen with one proton and one neutron in the nucleus . … Deuterium …