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    This study introduces a novel Iodine-125 radiation capsule for high dose rate brachytherapy, potentially reducing cancer treatment time. The design uses an electromagnet to control radiation release, achieving dose rates significantly higher than conventional low dose rate methods.

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    Area of Science:

    • Medical Physics
    • Radiation Oncology
    • Biomedical Engineering

    Background:

    • Conventional low dose rate (LDR) brachytherapy using Iodine-125 has a dose rate below 2 Gy/day.
    • Current LDR treatments face limitations in reducing treatment duration and radiation risk.

    Purpose of the Study:

    • To propose and evaluate a new radiation capsule design for Iodine-125.
    • To enable high dose rate (HDR) brachytherapy with a low energy radiation source.
    • To reduce cancer treatment duration and associated risks.

    Main Methods:

    • A novel capsule design utilizing an electromagnet to control radiation release was developed.
    • Monte Carlo simulations were performed using TOPAS (Geant4 toolkit).
    • MATLAB was used to analyze simulation results, comparing radiation intensity and beamwidth.

    Main Results:

    • The proposed capsule design can achieve dose rates of 10 Gy/min or higher.
    • A 150-micron gold shield effectively blocks radiation from high-activity Iodine-125 sources.
    • Simulations demonstrated varying radiation intensity and beamwidth based on capsule opening angles (15 and 120 degrees).

    Conclusions:

    • The new capsule design shows feasibility for enabling HDR brachytherapy with Iodine-125.
    • This innovation has the potential to significantly shorten cancer treatment times.
    • Controlled radiation release offers a promising approach for advanced brachytherapy techniques.