| fluence | A measure of the quantity of x-radiation in a beam in diagnostic radiology, either particle fluence, the number of photons entering a sphere of unit cross-sectional area, or energy fluence, the sum of the energies of the photons passing through a unit area. Compare: flux. Origin: L. Fluentia, a flowing, fr. Fluo, to flow (05 Mar 2000) |
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| particle fluence | <chemistry, radiobiology> at a given point in space, the sum of energies, the number of particles or photons incident during a given time interval on a small sphere centreed at that point, divided by the cross-sectional area of that sphere. It is identical with the time integral of the particle flux density. (16 Dec 1997) |
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