Physics Athens 2016

Ionometric standard



water P

D w  (S/  ) c,w Dose in a point P in water: =  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