Dose Course 2018_Flipping book

TRS-483 formalism for reference dosimetry in small fields

derivation of beam quality correction factors

f

f

ref D D

msr

N

ref detector

Qw,

Qw,

(

)

Qw, D,

f

f

,

pcsr msr

=

k

=

msr

msr

ref

Q

Q,

f

f

ref M M

N

msr

msr

Q

Q

Qw, D,

field instrument

msr

Determined through:

•Experiment: by a primary standard •Experiment: using dosimeters that can measure reference dose traceable to a primary standard and which have sufficiently low uncertainty (alanine, radiochromic film, diamond, liquid ion-chambers ...) •Calculation: Monte Carlo simulations (MC)