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Start Over Author "Carroll, J. J." Journal review of scientific instruments
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6. Megavoltage bremsstrahlung end point voltage diagnostic.

Author

Feroli, T., Litz, M. S., Merkel, G., Smith, T., Pereira, N. R., and Carroll, J. J.

Subjects
BREMSSTRAHLUNG, COMPTON electrons, RADIOCHROMATOGRAPHY, MONTE Carlo method software, SCIENTIFIC apparatus & instruments
Abstract

In a material, a beam of x rays is accompanied by various kinds of secondary radiation, including Compton electrons from collisions between the x rays and the material’s electrons. For megavoltage bremsstrahlung in air, many of these Compton electrons are forward-directed and fast enough to be deflected outside the beam’s edge by a magnetic field perpendicular to the beam. At the beam’s edge, the dose from the deflected Compton electrons has a pattern that depends on the radiation’s end point energy. Dose patterns measured with radiochromic film on a nominally 1 and 2 MV linear accelerator agree reasonably well with the corresponding Monte Carlo computations. With further development, the dose pattern produced outside the beam by such a sweeper magnet could become a noninvasive way to monitor megavoltage bremsstrahlung, when the end point energies are difficult to determine with other methods. [ABSTRACT FROM AUTHOR]

Published
2009
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