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Neutron beams from protons on beryllium.

D K Bewley, J P Meulders, M Octave-Prignot

    Physics in Medicine and Biology
    |September 1, 1980
    PubMed
    Summary
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    Proton beams on beryllium (p/Be) with polyethylene filters create neutron beams suitable for medical applications. This method is more economical than deuterium-beryllium (d/Be) reactions for generating comparable photon beams.

    Area of Science:

    • Medical physics
    • Radiation oncology
    • Nuclear physics

    Background:

    • Neutron beams are utilized in radiation therapy.
    • Proton-beryllium (p/Be) reactions offer an alternative neutron source.
    • Polyethylene filters can modify neutron beam characteristics.

    Purpose of the Study:

    • To measure dose rate and penetration of p/Be neutron beams.
    • To investigate the effect of polyethylene filters on these beams.
    • To compare p/Be neutron beams with medical linear accelerator photon beams.

    Main Methods:

    • Irradiation of beryllium targets with 30-75 MeV protons.
    • Measurement of neutron dose rate and penetration in water.
    • Addition of polyethylene filters to the collimator.

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  • Comparison of beam characteristics with 4-8 MeV linear accelerator photon beams.

    • Main Results:

    • p/Be neutrons with 5 cm polyethylene filtration produced beams comparable to 4-8 MeV medical linear accelerator photon beams.
    • Proton energies between 50-75 MeV were optimal for this comparison.
    • Dose rate and penetration characteristics were quantified.

    Conclusions:

    • Proton-beryllium reactions with polyethylene filtration provide a viable and economical method for generating neutron beams.
    • This technique offers a cost-effective alternative to deuterium-beryllium reactions for producing comparable photon beam qualities.