Dose 2016

Formalism to convert ionisation in plastic to dose to water

Dose at a point in water from an MV photon beam

Photon energy fluence: Ψ

  

 

µ

( ) ref Ψ= z z D

( ) ref

w β 

Dose:

en

Qw,

ρ

w

collision kerma (K c )

Formalism in Dosimetry Code of Practice for dose to water from a measurement in plastic

z eq ( ) N

w , s Q

z ref ( ) =

D

M

k

k

w , Q

s , Q

D,w,Q

Q,Q

o

o

CPE =1 TCPE scaling factor for high x-ray energies

from dose to water formalism

β

w