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Scatter Factor (SF)
The concept of buildup or (scatter) factor
alone
radiation
primary
to due
quantity
radiation
scattered
primary
to due
quantity
+
=
B
In narrow beam geometry (only primary radiation): B=1
In broad beam geometry: B>1
Total energy fluence at point of measurement
z
total
e
B
µ
−
Ψ
Ψ
≈
o
Unattenuated primary energy fluence
Narrow beam attenuation coefficient
depth
Attix (1986)