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Phantom correction
) (
) (
,
,
Q D
QD
p
phant
w
ww
phant
•
Phantom material MUST be checked for density variation and composition (Ca or
th hi h Z t t
i ti
th t
b
t 30%) t
i i i
t
B
o er g con en var a on a can e up o
o m n m ze ype
uncertainty.
Hi h
it
l ti
(PMMA
•
g pur y p as cs
,
polystyrene) might be preferable since
p
phant
deviation from unity is greater
1
for LE source dosimetry BUT type B
uncertainty of the correction will be
lower.
phant
p
Figure from: Luxton, Med. Phys. 21(5), 631 (1994)