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Fluence in Spectral Distributions #1045

Answered by ftessier
LEley22 asked this question in Physics
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Note that the constant 0.08716 here is to prevent a numerical divergence of $\large 1/\!\cos \theta$, when $\large \cos\theta \rightarrow 0$ (particle nearly parallel to the surface).

  • The so-called planar fluence is simply the number of particles divided by the surface area regardless of their directions.

  • The estimated real fluence includes a $\large 1/\!\cos \theta$ correction factor to take into account that a particles that crosses the surface at an oblique angle contributes to fluence at "more points" on the surface, very loosely speaking.

In more formal terms: the fluence contribution of a particle over a volume is the path length inside the volume, divided by that volume; this…

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