2298-2299 / 3107
Basic Dose Calculation Principles
Simplified depth dose formalism
DD(d)
%
=D
max •
(f+d
m
/f+d)
2 •
e
-(
µ
•
d) •
K
s
f
distance from source to surface
d
m
or depth to
D
max
d
is depth in tissue
K
s
is the scatter (K
s
= *
S
c
)
scatter
“For a given photon beam at a given SSD,
the dose rate at point P depends on the field
size A; the larger the field size, the larger the
dose. “ IAEA Handbook Chapter 6
primary component