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X-ray spectrum
Fluence differential in energy
or
particle fluence spectrum
dE
d
dA
dN
dE
d
Φ
=
=Φ
E
Differential energy fluence
or
energy fluence spectrum
E
E
E
dE
d
E
dE
d
Φ=
Φ
=
Ψ
=Ψ
keV
E
7.60
≈
Φ
keV
E
8.64
≈
Ψ