Glossary of terms used on this site
F
| Term | Definition |
|---|---|
| Fallout |
The transfer of radionuclides produced by nuclear weapons from the atmosphere to earth; the material transferred. |
| Fast neutrons |
Conventionally, neutrons with energies in excess of 0.1 MeV. Corresponding velocity of about 4 × 106 m s-1 |
| Fast reactors |
See nuclear reactor. |
| Fission |
Nuclear fission. A process in which a nucleus splits into two or more nuclei and energy is released. Frequently refers to the splitting of a nucleus of uranium-235 into two approximately equal parts by a thermal neutron with emission of other neutrons. |
| Fission products |
Nuclides or radionuclides produced as a result of fission. |
| Free radical |
A grouping of atoms that normally exists in combination with other atoms but can sometimes exist independently. Generally very reactive in a chemical sense. |
| Frequency |
The number of complete cycles of an electromagnetic wave in a second. Unit hertz, symbol Hz. 1 Hz = 1 cycle per second. |
| Fusion |
Thermonuclear fusion. A process in which two or more light nuclei are formed into a heavier nucleus and energy is released. |