Dosimetric Characteristics of Clinical Photon Beams
Dosimetric Characteristics of Clinical Photon Beams
Dosimetric Characteristics of Clinical Photon Beams
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KLEIN- NISHINA CROSS SECTION<br />
FOR THE COMPTON INTERACTION<br />
d e�<br />
d�<br />
Ψ<br />
�<br />
2 2<br />
0 2<br />
sin<br />
r ��<br />
h�<br />
' ��<br />
��<br />
h�<br />
h�<br />
'<br />
� � � � �<br />
2 � h�<br />
� � h�<br />
' h�<br />
PHOTONS SCATTERED AT AN ANGLE, Ψ<br />
��<br />
� �<br />
�<br />
PHOTONS SCATTERED INTO A UNIT<br />
SOLID ANGLE, Ω<br />
SOLID ANGLE AVAILABLE PER<br />
UNIT ANGLE<br />
d�<br />
d d��<br />
� 2� sin �<br />
Based on the kinematics <strong>of</strong> Compton interaction, the average<br />
p g<br />
energy <strong>of</strong> scattered photons is less than 1Mev and is independent<br />
<strong>of</strong> the incident energy.
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