Dose 2016

Note on TPS dose reporting (MV beams)

Ψ

approx. equations: :

0

Reference dosimetry: dose to a small water element w embedded at depth z in a large water phantom:

µ

wen,

w µ−

z

≅

Ψ

D

e

Ww,

o

ρ

w

Assuming that cell nuclei is water (ICRU 83) i.e. dose to a small water element w embedded in a phantom of medium M:

  

  

S

µ

m Ψ ≅ − µ e z

men,

D

Mw,

o

ρ

ρ

m

µ

men,

m µ−

z

≅

Ψ

D

e

Dose to the medium in the medium:

Mm,

o

ρ

w

  

  

S D D

=

⇒ conversion of dose to medium to dose to water

Mw,

Mm,

ρ

m

from Anders Ahnesjö