Dose Course 2018_Flipping book
Primary Photon beam energy balance
z
0
E =
Incident energy fluence
0
0
z
−
e
Attenuated energy fluence at depth z
0
0
z
−
e
Energy/mass ”taken away” from the direct beam, TERMA, at depth z
en
z
−
e
Energy/mass transfered into collision KERMA at z , appr. Primary Dose
0
en −
z
−
Energy/mass transfered into photon scatter, SCERMA, at depth z
e
0
TERMA, Total Energy Released per MAss KERMA, Kinetic Energy Released per MAss SCERMA, photon Scatter Energy Released per MAss Collision KERMA+SCERMA=TERMA
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