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d

d

max

d

MV/3 [cm]

The effective measurement depth in the mini-phantom/build-up cap must be large enough to stop

contaminating electrons.

6 MV

d=0.9 cm

d=5 cm

24 MV

d=4 cm

d=10 cm

d=2.3 cm

Frye DM, et al (1995) Med Phys 22, 249-53

Two rules of thumb

used to eliminate

e

-

contamination:

Factor-based dose calculations: basic dosimetric quantities

S

c

: mini-phantom/buildup cap design – depth considerations