Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Electron contamination in 60Co gamma-ray beams.

F H Attix, F Lopez, S Owolabi

    Medical Physics
    |May 1, 1983
    PubMed
    Summary

    Secondary electrons in radiotherapy photon beams, known as electron contamination, affect dose buildup and skin sparing. This study quantifies their impact using a 60Co source and various filters, revealing a 12% minimum relative dose in a clear beam.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    Multi-scale datasets for monitoring Mediterranean oak forests from optical remote sensing during the SENTHYMED/MEDOAK experiment in the north of Montpellier (France).

    Data in brief·2024
    Same author

    Kinetic and hydrogen production analysis in the sequential valorization of a Populus clone by cold alkaline extraction and pyrolysis.

    Scientific reports·2024
    Same author

    Results of salvage neck dissection after chemoradiation in locally advanced head and neck squamous cell carcinoma.

    European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery·2023
    Same author

    Loss of p16 expression is a risk factor for recurrence in sinonasal inverted papilloma.

    Rhinology·2022
    Same author

    Simplified risk-prediction for benchmarking and quality improvement in emergency general surgery. Prospective, multicenter, observational cohort study.

    International journal of surgery (London, England)·2021
    Same author

    Follow-up with Telemedicine in Early Discharge for COPD Exacerbations: Randomized Clinical Trial (TELEMEDCOPD-Trial).

    COPD·2020

    Area of Science:

    • Medical Physics
    • Radiation Oncology
    • Radiotherapy Physics

    Background:

    • Radiotherapy photon beams contain secondary electrons (electron contamination) from interactions with beamline components and air.
    • Electron contamination influences critical dosimetric parameters such as skin sparing, dose buildup curves, and depth of dose maximum.
    • Understanding and quantifying electron contamination is crucial for accurate radiotherapy dose delivery.

    Purpose of the Study:

    • To investigate and quantify the impact of electron contamination on dose buildup curves in radiotherapy.
    • To evaluate the effectiveness of different filters in reducing electron contamination from a 60Co source.
    • To determine the minimum achievable relative dose in a 'clear' 60Co gamma-ray beam.

    Main Methods:

    • Used a 60Co source and a flat ion chamber to measure dose buildup curves in a polystyrene phantom.
    • Varied source distances (72-200 cm) and beam sizes (5x5 to 35x35 cm2 at 80 cm SSD).
    • Employed filters (Lucite, Cu, Pb-loaded acrylic, Ba/Pb-loaded glass) and a He-gas-filled bag to study electron generation and contamination.

    Main Results:

    • Different filters significantly altered dose buildup curves by affecting electron contamination.
    • Electron generation in air was studied using a He-gas-filled plastic bag.
    • An estimated 12% relative dose was determined for the lowest achievable dose in a clear 60Co gamma-ray beam.

    Conclusions:

    • Electron contamination from radiotherapy sources and air significantly impacts dose distribution.
    • Filters can be used to modify and potentially reduce electron contamination.
    • Accurate characterization of electron contamination is essential for precise radiotherapy planning and treatment.

    Related Experiment Videos