Dose 2016

Derivation of formalism to convert ionisation in plastic to dose to water Converting ionisation measurement in plastic to dose in water

Phantoms irradiated with the same MV photon beam

In water at a reference depth

In solid plastic at an equivalent depth

z

z

eq

ref

( )

( ) ref

k k N z M z D

=

Qw,

eq Qs,

Qw, D, o

QQ,

Qw, s,

o

How does one determine:

equivalent depths and phantom dose conversion factors?