Dose Course 2018_Flipping book

concepts:

Dimensions of a pencil kernel

Basic dose equation

p

(

)

(

) ( 

)

 

, x x y y z x y − − , d d   



, , D x y z

, x y

=







Field

Dimensional analysis

deposited energy

Energy

Energy incident energy

=





area



mass

area mass

integration element

Field

dose

energy fluence

pencil kernel

Hence, the dimension is energy fraction per mass, or mass -1 (since energy fraction is dimensionless).