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Considering now uncharged particles (photons) of a given energy distribution,
then the kerma K is given according to
Kerma K
dV
dE
dm
dE
K
tr
tr
.
1
ρ
= =
dm
=ρ.dVair
∫
∫
ρ
µ
Ψ=
ρ
µ
Φ=
E
E
tr
E
E
E
tr
E
dE.
.
dE.
.E.
K
where Φ
E
and Ψ
E
are the energy distribution of fluence and energy fluence of the
photons respectively.
(µ
tr
/ρ)
E
is the mass energy transfer coefficient of the material under consideration
for photons of energy E.