Fluence

The quotient of $dN$ by $da$, where $dN$ is the number of particles incident on a sphere of cross-sectional area $da$, thus:

$\Phi = \frac{dN}{da}$

The unit of fluence is ^m-2.

(Adapted from ICRP Publication 116, 2010)

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from ICRP Publication 103, 2007; ICRP Publication 110, 2008; ICRP Publication 119, 2012

The quotient of $dN$ by $da$, where $dN$ is the number of particles incident on a small sphere of cross-sectional area $da$, thus:

$\Phi = \frac{dN}{da}$