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.

Neutron chain reaction

A measure of the intensity of neutron radiation, determined by the rate of flow of neutrons. The neutron flux value is calculated as the neutron density (n) multiplied by neutron velocity (v), where n is the number of neutrons per cubic centimeter (expressed as neutrons/c³) and v is the distance the neutrons travel in 1 second (expressed in centimeters per second, or c/sec). Consequently, neutron flux (nv) is measured in neutrons/cm²-sec.

Page Last Reviewed/Updated Tuesday, March 09, 2021