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Scatter Factors (total vs primary)
TAR(A,z), SAR(A,z), PSF(A), NPSF(A)
‘Primary dose in water is obtained ‘in-air’ using a buildup cap on the detector (dose to small mass of
medium): this is not really ‘primary’ as it includes scattered radiation from the buildup cap.
Further
d
Dmax
detector
arguments by Burns J E in Appendix F of
BJR Supp 25 (1996)
PSF
D
D D D
total
×
=
+
=
Primary
Scatter
Primary
cap
buildup
'
cap
buildup
cap
buildup
Primary
Primary
total
−
−
−
⋅
+
=
DB
D
D
cap
buildup
total
Primary
−
≠
D D