Dose 2016

Particle Fluence

Energy Fluence

N the expectation value of the number of particles striking a finite sphere surrounding point P

The amount of energy ‘striking’ the sphere

For a monoenergetic beam:

dR

dN

E

Φ= = =Ψ E

volume dV

d A

dA

dA

dN

[ ] 2 − m

=Φ

particle traversing sphere

dA

P

For a component of a polyenergetic beam:

d N is the number of particles incident on a infinitesimal sphere surrounding P of cross sectional area d A

d Ψ =Ψ

E

Φ=

E

E

dE

With R being the expectation value of the total energy (excluding rest mass energy) or Radiant energy carried by all particles N, energy fluence in the quotient of this energy to the cross sectional area dA