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Related Experiment Videos

Transfer dosemeters for fast neutron sources.

K Becker, J S Jun

    Physics in Medicine and Biology
    |January 1, 1976
    PubMed
    Summary

    Fission fragment track etching offers a reliable method for mail dosimetry intercomparisons using fast neutron detectors. This technique accurately measures doses between 50-500 rad, crucial for radiobiology and radiotherapy applications.

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    Area of Science:

    • Nuclear physics
    • Radiation detection
    • Dosimetry

    Background:

    • Fast neutron sources are increasingly used in radiobiology and radiotherapy.
    • Dosimetry intercomparisons via mail are desirable for these applications.
    • Existing neutron detectors have limitations for mail-based intercalibrations.

    Purpose of the Study:

    • To evaluate and select an appropriate integrating fast neutron detector for mail dosimetry intercomparisons.
    • To develop and validate fission fragment track etching techniques for accurate neutron dosimetry.

    Main Methods:

    • Comparative analysis of various integrating fast neutron detectors.
    • Selection of fission fragment track etching due to detector properties (small, rugged, fading resistant, inexpensive, accurate).
    • Utilizing combinations of 232Th or 237Np with organic and inorganic track detectors.
    • Employing automatic spark counting and visual track counting for dose assessment.

    Main Results:

    • Fission fragment track etching is suitable for mail dosimetry intercomparisons.
    • Developed techniques cover the 50-500 rad dose range with high accuracy (sigma <= 5%).
    • Identified potential errors from overlapping fission fragment and recoil particle tracks at high neutron energies.

    Conclusions:

    • Fission fragment track etching is a viable and accurate method for fast neutron dosimetry intercomparisons.
    • The developed techniques meet the requirements for radiobiology and radiotherapy applications.
    • Strategies to mitigate errors in track counting at high neutron energies require further investigation.

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