1 bragg curve protons and carbon. 2 application of range the localized energy deposition of heavy...
Post on 21-Dec-2015
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Bragg CurveProtons and
Carbon
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Application of RangeThe localized energy deposition of
heavy charged particles can be useful therapeutically = proton radiation therapy
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Proton Therapy
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Proton Therapy
Energy range of interest from 50 (eye) – 250 (prostate) MeV
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Proton Therapy
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Proton Therapy
Modulator, aperture, and compensator
Modulator
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Proton Therapy
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Proton Therapy
Lung cancer treatment Intensity modulated radiation therapy
vs proton therapy
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CyclotronThe first circular accelerator was the
cyclotron Developed by Lawrence in 1931 (for $25)
Grad student Livingston built it for his thesis About 4 inches in diameter
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CyclotronPrinciple of operation
Particle acceleration is achieved using an RF field between “dees” with a constant magnetic field to guide the particles
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CyclotronPrinciple of operation
c approaches vas cancelt won'
momentum and velocity in vsince relativityby Limited
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daccelerate is particle the
asconstant remainsfrequency that theNote
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eB
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CyclotronWhy don’t the particles hit the pole
pieces? The fringe field (gradient) provides vertical
and (less obviously) horizontal focusing
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CyclotronTRIUMF in Canada has the world’s largest
cyclotron
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CyclotronTRIUMF
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CyclotronNSCL cyclotron at Michigan State
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Cyclotron
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