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  • Title: [Depth dose characteristics of photon beams released from a scanning-type racetrack microtron].
    Author: Sato T.
    Journal: Nihon Hoshasen Gijutsu Gakkai Zasshi; 2002 Jun; 58(6):809-16. PubMed ID: 12518102.
    Abstract:
    The MM50 is a racetrack microtron that can emit photon beams or electron beams up to 50 MeV. The MM22 using the scanning beam method and the MM22 using a flattening filter method both to flatten the emission field and a water phantom with particular function measurable of PDD etc. in an accelerator using the scanning beam method to make up the PDD curve of photon beams from the linear accelerator. The Clinac21EX was thus employed. The maximum depth of beam flux was shallow, the gradient of the flux decrement large, the surface dose large, and the estimated nominal energy low to the same nominal energy. From these findings, it can be said that thorough comprehension of the characteristics of beam flux properties for these units is necessary when photon beams are to be used.
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