Neutron flux
Total distance traveled by neutrons within a volume over a time period / From Wikipedia, the free encyclopedia
The neutron flux is a scalar quantity used in nuclear physics and nuclear reactor physics. It is the total distance travelled by all free neutrons per unit time and volume.[1] Equivalently, it can be defined as the number of neutrons travelling through a small sphere of radius in a time interval, divided by a maximal cross section of the sphere (the great disk area, ) and by the duration of the time interval.[2]: 82-83 The dimension of neutron flux is and the usual unit is cm−2s−1 (reciprocal square centimetre times reciprocal second).
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The neutron fluence is defined as the neutron flux integrated over a certain time period. So its dimension is and its usual unit is cm−2 (reciprocal square centimetre). An older term used instead of cm−2 was "n.v.t." (neutrons, velocity, time).[3]