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MgO:Fe as an absolute radiation dosimeter.

T E Schultheiss

    Medical Physics
    |May 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Iron impurities in magnesium oxide (MgO) become iron 3+ after irradiation, showing a distinct ultraviolet absorption. This property enables MgO:Fe to function as a solid-state radiation dosimeter.

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    Area of Science:

    • Solid-state physics
    • Materials science
    • Radiation detection

    Background:

    • Iron impurities in magnesium oxide (MgO) can exist in multiple valence states (Fe1+, Fe2+, Fe3+).
    • Annealing in reducing atmospheres significantly reduces the Fe3+ concentration in MgO.
    • Radiation, such as X-rays or electrons, can alter the valence state of iron impurities.

    Purpose of the Study:

    • To investigate the valence state changes of iron impurities in MgO upon irradiation.
    • To explore the potential of iron-doped MgO as a solid-state radiation dosimeter.

    Main Methods:

    • Annealing of MgO:Fe samples in a reducing atmosphere.
    • Irradiation of MgO:Fe samples using X-rays and electrons.
    • Monitoring the optical absorption spectrum, specifically the 285 nm band associated with Fe3+.

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    Main Results:

    • Annealing in a reducing atmosphere minimizes Fe3+ presence.
    • Irradiation induces hole trapping at Fe2+ sites, converting them to Fe3+.
    • The Fe3+ ion exhibits a characteristic ultraviolet absorption at 285 nm, which grows with irradiation dose.

    Conclusions:

    • The radiation-induced formation of Fe3+ and its associated optical absorption band in MgO:Fe can be monitored.
    • This phenomenon forms the basis for using MgO:Fe as a solid-state dosimeter, similar to chemical dosimeters like ferrous sulfate.