Megavoltage bremsstrahlung end point voltage diagnostic
- Army Research Laboratory, 2800 Powder Mill Rd., Adelphi, Maryland 20873 (United States)
- Ecopulse, Inc., P.O. Box 528, Springfield, Virginia 22150 (United States)
- Youngstown State University, Youngstown, Ohio 44555 (United States)
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.
- OSTI ID:
- 21266780
- Journal Information:
- Review of Scientific Instruments, Vol. 80, Issue 3; Other Information: DOI: 10.1063/1.3098947; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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