Beam spoiler
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A beam spoiler is a piece of material, placed into the path of the photon beam in radiotherapy. The purpose of the spoiler is to reduce the depth of the maximum radiation dosage.[1]
Composition
[edit]The beam spoiler is composed of a sheet of material which has a low atomic number,[2] typically lucite, the thickness of which is varied according to the beam energy and the distance by which the radiation dose must be shifted.[1]
Action
[edit]As the primary photon beam passes through the plate, secondary electrons are generated. The beam exiting the spoiler is a combination of the spoiler-attenuated photons and the spoiler-generated electrons. The electron component alters the depth dose in the buildup region in a way that depends on the photon beam energy, the field size, and the distance of the spoiler from the treatment surface.
References
[edit]- ^ a b Bentel, G.C. (1996) Radiation therapy planning p.103. McGraw-Hill Professional ISBN 0-07-005115-1 Retrieved September 2011.
- ^ Specht, L., Yahalom, J. (2010) Radiotherapy for Hodgkin Lymphoma p.125. Springer. ISBN 3-540-78455-1 Retrieved September 2011
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