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  2. Varian Medical Systems - Wikipedia

    en.wikipedia.org/wiki/Varian_Medical_Systems

    On April 2, 1999, these divisions split to become Varian Semiconductor, Varian, Inc., and Varian Medical Systems. [12] [13] In August 2020, Siemens Healthineers announced plans to acquire Varian Medical Systems in an all-stock deal valued at $16.4 billion. [14] [15] The deal was approved and completed on 15 April 2021. [16]

  3. Linear particle accelerator - Wikipedia

    en.wikipedia.org/wiki/Linear_particle_accelerator

    A linear particle accelerator (often shortened to linac) is a type of particle accelerator that accelerates charged subatomic particles or ions to a high speed by subjecting them to a series of oscillating electric potentials along a linear beamline.

  4. Klystron - Wikipedia

    en.wikipedia.org/wiki/Klystron

    The Varians went on to found Varian Associates to commercialize the technology (for example, to make small linear accelerators to generate photons for external beam radiation therapy). Their work was preceded by the description of velocity modulation by A. Arsenjewa-Heil and Oskar Heil (wife and husband) in 1935, though the Varians were ...

  5. External beam radiotherapy - Wikipedia

    en.wikipedia.org/wiki/External_beam_radiotherapy

    The role of the cobalt unit has largely been replaced by the linear accelerator, which can generate higher energy radiation. [ 4 ] [ 5 ] Nonetheless, cobalt treatment still retains some applications, such as the Gamma Knife , since the machinery is relatively reliable and simple to maintain compared to the modern linear accelerator.

  6. Proton therapy - Wikipedia

    en.wikipedia.org/wiki/Proton_therapy

    In medicine, proton therapy, or proton radiotherapy, is a type of particle therapy that uses a beam of protons to irradiate diseased tissue, most often to treat cancer.The chief advantage of proton therapy over other types of external beam radiotherapy is that the dose of protons is deposited over a narrow range of depth; hence in minimal entry, exit, or scattered radiation dose to healthy ...

  7. Varian Associates - Wikipedia

    en.wikipedia.org/wiki/Varian_Associates

    Varian Associates was one of the first high-tech companies in Silicon Valley.It was founded in 1948 by Russell H. and Sigurd F. Varian, William Webster Hansen, and Edward Ginzton to sell the klystron, the first vacuum tube which could amplify electromagnetic waves at microwave frequencies, and other electromagnetic equipment.

  8. List of accelerators in particle physics - Wikipedia

    en.wikipedia.org/wiki/List_of_accelerators_in...

    Fermitron was an accelerator sketched by Enrico Fermi on a notepad in the 1940s proposing an accelerator in stable orbit around the Earth. The undulator radiation collider [7] is a design for an accelerator with a center-of-mass energy around the GUT scale. It would be light-weeks across and require the construction of a Dyson swarm around the Sun.

  9. Monitor unit - Wikipedia

    en.wikipedia.org/wiki/Monitor_unit

    A monitor unit (MU) is a measure of machine output from a clinical accelerator for radiation therapy such as a linear accelerator or an orthovoltage unit. Monitor units are measured by monitor chambers, which are ionization chambers that measure the dose delivered by a beam and are built into the treatment head of radiotherapy linear accelerators.

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