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Radiation Protection Glossary

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Fluence Rate
Fluence can be defined as the total number of particles (typically Gamma Ray Photons ) crossing over a sphere of unit cross section which surrounds a Point Source of Ionising Radiation . The Fluence rate is the number of particles crossing per unit time (which is numerically equal to the product of number of particles and their average speed). This is a useful quantity in Radiation Protection when calculating Dose Rates from point sources or other geometries (e.g. Line Sources, plane source or Volume Sources). The dose delivered by a fluence at a point in space will be related to the energy of the photons.