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5.2
Required quantities:
Alternative definition of fluence
The fluence can also be defined by the
track-length density (= track-length per volume)
of particles at a point in space within a small volume:
dV
)r(dL
)r(
= Φ
14
The fluence at a point P is numerically equal to the expectation
value of the sum of the particle track lengths (assumed to be straight)
that occur in an infinitesimal volume dV at P divided by dV
Chilton 1978, Health Physics
34
, 715