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    Area of Science:

    • Medical Physics
    • Radiation Oncology
    • Radiological Physics

    Background:

    • External-beam radiotherapy aims for precise dose delivery to tumors while sparing surrounding normal tissues.
    • Ion beams (protons, carbon ions) offer superior dose distributions due to their finite range, reducing normal tissue exposure compared to photons.
    • Accurate treatment planning is essential for maximizing therapeutic efficiency and minimizing dose to healthy tissues.

    Framework:

    • Radiation exposure in out-of-field regions results from secondary neutrons, photons, particle fragments, and activated materials.
    • These unavoidable doses necessitate careful consideration for patient radiological protection.
    • Radiological protection for medical staff in ion beam facilities requires specific attention due to potential activation of equipment and air.

    Implementation:

    • Ion beam radiotherapy systems are more complex than conventional photon radiotherapy.
    • Management and control of therapeutic equipment and treatment room air are necessary due to particle beam activation.
    • Adherence to regulatory requirements for radiological protection and safety management is mandatory.

    Implications:

    • Existing regulations for occupational exposure in photon radiotherapy can be adapted for ion beam radiotherapy.
    • Comprehensive staff training and robust quality assurance programs are recommended.
    • These measures are vital to prevent accidental patient exposure, minimize unnecessary doses to normal tissues, and reduce staff radiation exposure.