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Dose from Dose-Rate
TG-43 derives the Initial Dose Rate: T >>
τ
2/1
2/1
T
4427 .1
2ln
T 1
= =
λ
=τ
k
u
:
is a units conversion factor to convert the dose rate expressed
in cGy h
-1
and considering the time unit of the value T to the
− ⋅τ⋅
θ =θ
τ
−
T
0
e1 )t, ,r(D) ,r(D
&
This is e.g. the case for permanent implants with
125
I
or
103
Pd
!
desired dose unit, Gy or cGy.