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Rubidium-82 generators for imaging studies

Y Yano, P Chu, T F Budinger

    Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
    |January 1, 1977
    PubMed
    Summary
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    Bio-Rex 70 resin demonstrated superior performance for strontium-82 (Sr-82) adsorption and rubidium-82 (Rb-82) elution in a compact generator. This resin achieved significantly higher separation factors compared to Chelex-100, crucial for efficient radioisotope production.

    Area of Science:

    • Radiochemistry
    • Nuclear Medicine
    • Materials Science

    Background:

    • Rubidium-82 (Rb-82) is a short-lived positron-emitting isotope vital for Positron Emission Tomography (PET) imaging.
    • Compact generators are essential for on-demand production of Rb-82 for clinical use.
    • Strontium-82 (Sr-82) is the parent isotope for Rb-82 generation.

    Purpose of the Study:

    • To evaluate the efficacy of Bio-Rex 70 and Chelex-100 ion-exchange resins for a compact Sr-82/Rb-82 generator.
    • To determine optimal conditions for Sr-82 adsorption and Rb-82 elution.
    • To assess the long-term performance and separation capabilities of the resins.

    Main Methods:

    • Strontium-82 (Sr-82) was produced via spallation reactions.
    • Adsorption of Sr-82 onto Bio-Rex 70 and Chelex-100 ion-exchange resins was measured.

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  • Rubidium-82 (Rb-82) elution yields and strontium breakthrough were quantified.
  • Rb-82/Sr-82 separation factors were determined using 2% NaCl elutions under various conditions.

    • Main Results:

    • Bio-Rex 70 resin exhibited high Sr-82 adsorption and efficient Rb-82 elution.
    • Separation factors ranging from 10^7 to 10^8 were achieved with Bio-Rex 70.
    • Chelex-100 resin yielded lower separation factors, approximately 5 x 10^4.
    • Both resins were evaluated under initial and long-term elution conditions.

    Conclusions:

    • Bio-Rex 70 is a highly effective ion-exchange resin for developing compact Sr-82/Rb-82 generators.
    • The high separation factors obtained with Bio-Rex 70 are critical for producing high-purity Rb-82 for PET imaging.
    • Further optimization may enhance the performance of Chelex-100, but Bio-Rex 70 shows superior potential.