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Related Experiment Videos

An evaluation of radiocolloid sizing techniques

A Warbick, G N Ege, R M Henkelman

    Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
    |August 1, 1977
    PubMed
    Summary

    Accurate radiocolloid sizing is crucial. Electron microscopy is the preferred method for determining particle size and chemical composition, resolving previous discrepancies.

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    Public health·2019

    Area of Science:

    • Nuclear medicine
    • Radiopharmaceutical science
    • Materials science

    Background:

    • Radiocolloids are essential in nuclear medicine imaging.
    • Accurate particle size determination is critical for efficacy and safety.
    • Existing sizing techniques have limitations due to small particle sizes and polydispersity.

    Purpose of the Study:

    • To review and compare techniques for sizing radiocolloids.
    • To establish a reliable method for determining radiocolloid particle size and chemical nature.
    • To resolve discrepancies in reported radiocolloid sizes.

    Main Methods:

    • Review of radiocolloid sizing techniques.
    • Comparative analysis using Nuclepore filtration, ultracentrifugation, and electron microscopy.
    • Characterization of Technetium-99m sulfide colloid, Technetium-99m antimony sulfide colloid, and Indium-113m hydroxide.

    Main Results:

    • Electron microscopy was identified as the optimal technique for sizing radiocolloids below 100 nm.
    • Accurate particle size and shape determination was achieved using electron microscopy.
    • X-ray fluorescence analysis confirmed the chemical nature of the examined radiocolloids.
    • Resolved size discrepancies reported in previous literature.

    Conclusions:

    • Electron microscopy is the method of choice for accurate radiocolloid sizing.
    • Characterizing the chemical nature of radiocolloids is vital for accurate size interpretation.
    • This study provides a reliable methodology for radiocolloid characterization.

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