332-333 / 3107
Ionometric standard
D
w
=
w
(S/
)
c,w
Dose in a point P in water:
w
water
P
measurement in water with air-filled i.c.
air
water
P
D
air
=
air
(S/
)
c,air
D
w
= D
air
(S/
)
c,w
/ (S/
)
c,air
D
w
= D
air
s
w,air
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