Physics Bucharest 2017
Ionometric standard
water P
Dose in a point P in water:
w
=
(S/ ) c,w
D w
w
measurement in water with air-filled i.c.
air
=
(S/ ) c,air
D air
P
air
water
Bragg-Gray cavity theory: air
=
w
valid if: - dimensions of air are small enough to not disturb charged particle fluence w - charged particles are only generated in w
(S/ ) c,w
/ (S/ ) c,air
D w
= D air
s w,air
D w
= D air
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