Dose Course Book

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Pencil kernel characterization

( )

( )

zr

D

drr

zrd

,

2

1

,

meas

rel,

π

=

I. Radial differentiation of relative dose on CAX (using quantities describing

broad beam dosimetric data).

Dashed line :MC

Solid line: exp

2

r

z

6 MV

25 MV

CP Ceberg, et al (1996)

Med Phys 23

, 505-11.

Ignored:

• Beam divergence

• Off-axis changes in fluence

• Off-axis softening