1166 / 1542
Basic Dose Calculation Principles
Simplified depth dose formalism
DD(d)
%
=D
max •
(f+d
m
/f+d)
2
•
e
-(
m
•
d)
•
K
s
D
max
max dose,ie 100% for PDD
f
distance from source to surface
d
m
or depth to
D
max
d
is depth in tissue
K
s
is the scatter
scatte
r
“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