Dosimetric Characteristics of Clinical Photon Beams

Photon Beam Delivery Systems
S band Linear Accelerators
X band Linear Accelerators
Medical Linear
Accelerators:
�� Accelerate electrons in ppulses lses
to kinetic energies from 4 to 25
MeV.
�Use �Use non-conservative
microwave RF fields in the
frequency range from 103 MHz (L
band) to 104 band) to 10 MHz (X band), with
the vast majority running at 2856
MHz (S band).
� Some provide beams only in
the low megavoltage range (4-6
MV), while others provide both
photons and electrons at various
megavoltage l energies. i A typical i l
modern high-energy linac can
provide 2-3 photon energies.