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Convenient 77Kr production method for medical use

R Iwata, M Monma, K Tamate

    Radioisotopes
    |November 1, 1982
    PubMed
    Summary

    A new method efficiently produces Krypton-77 (77Kr) for medical imaging. This process uses a bromine-79 (79Br) target and yields high-purity 77Kr suitable for routine cerebral blood flow measurements.

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    Area of Science:

    • Nuclear Medicine
    • Radiochemistry
    • Medical Imaging

    Background:

    • Cerebral blood flow (CBF) measurement is crucial for diagnosing neurological disorders.
    • Efficient production of medical radioisotopes like Krypton-77 (77Kr) is essential for routine clinical application.
    • Current methods for 77Kr production may lack convenience or scalability for widespread medical use.

    Purpose of the Study:

    • To develop a convenient and routine method for producing 77Kr for medical applications.
    • To optimize the production parameters for maximizing yield and radionuclidic purity of 77Kr.
    • To validate the suitability of the developed method for clinical use in CBF measurement.

    Main Methods:

    • Utilized an aqueous sodium bromide (NaBr) solution (40 wt%) as the target material.
    • Produced 77Kr via the 79Br(p, 3n)77Kr nuclear reaction.
    • Employed a rapid recovery method using a helium (He) gas stream to isolate 77Kr from the target.
    • Investigated optimal target thickness (approx. 5-6 mm) by analyzing radionuclidic purity and proton current effects on yield.

    Main Results:

    • Achieved approximately 740 MBq (20 mCi) of 77Kr.
    • Obtained a high radionuclidic purity of 92% for the produced 77Kr.
    • Production was rapid, yielding the desired quantity within 5 minutes after a 20-minute irradiation with a 5 microA proton beam.
    • Optimal target thickness was determined to enhance yield and purity.

    Conclusions:

    • The developed method provides a convenient and efficient route for routine 77Kr production.
    • The high yield and purity of 77Kr make it suitable for medical applications, particularly in cerebral blood flow studies.
    • This method demonstrates significant potential for supporting widespread clinical use of 77Kr.

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