Dose 2016

Derivation of formalism to convert ionisation in plastic to dose to water Distance scaling in a clinical beam

 

PWDT    

Example: distance scaling for Plastic Water DT (PWDT)

µ

ρ

z

z

=

refw, = ⇒ ≈

w

c

z

PWDT

,

 

   

eqs

µ

z

c

PWDT

PWDT

ρ

w

At the depth of 5cm:

983 .0

c

=

PWDT

and NOT :

963 .0

ρ

=

PWDT e,

The water equivalent distance of 5cm PWDT is 4.92cm