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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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Teletherapy

Teletherapy … Treatment in which the source of the therapeutic radiation is at a distance from the body. Because teletherapy is often used to treat malignant tumors deep within the body by bombarding them with a high-energy beam of gamma rays (from a …

Categories of radiation sources

Categories of radiation sources …   The International Atomic Energy Agency 's Code of Conduct on the Safety and Security of Radioactive Sources defines the five categories for radiation sources to help ensure that sufficient controls are being used to …

Atomic number

Atomic number … The number of positively charged protons in the nucleus of an atom . … Atomic number …

Fuel reprocessing (recycling)

Fuel reprocessing (recycling) … The processing of reactor fuel to separate the unused fissionable material from waste material . Reprocessing extracts isotopes from spent nuclear fuel so they can be used again as reactor fuel. Commercial reprocessing is …

External radiation

External radiation … Exposure to ionizing radiation when the radiation source is located outside the body. … External radiation …

Fast neutron

Fast neutron … A neutron with kinetic energy greater than its surroundings when released during fission . … Fast neutron …

Decay heat

Decay heat … The heat produced by the decay of radioactive fission products after a reactor has been shut down. … Decay heat …

Biological shield

Biological shield … A mass of absorbing material placed around a reactor or radioactive source to reduce the radiation to a level safe for humans. … Biological …

Fission gases

Fission gases … Those fission products that exist in the gaseous state. In nuclear power reactors , this includes primarily the noble gases , such as krypton and xenon. … Fission …

Derived Air Concentration-Hour (DAC-hour)

Derived Air Concentration-Hour (DAC-hour) … The product of the concentration of radioactive material in air (expressed as a fraction or multiple of the derived air concentration for each radionuclide ) and the time of exposure to that radionuclide, in …