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Transmutation products may influence radiotracer diffusion rates in an ionic solid.

G C Wei, B J Wuensch

    Science (New York, N.Y.)
    |July 8, 1977
    PubMed
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    Radiotracer diffusion measurements can be inaccurate due to ionization changes from alpha, beta(+), or beta(-) emissions. These emissions alter vacancy concentrations or create space charge, potentially causing errors of up to tenfold in diffusion rates.

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    Area of Science:

    • Radiochemistry
    • Materials Science
    • Nuclear Physics

    Background:

    • Radiotracer diffusion is crucial for understanding material transport.
    • Radioactive decay of tracers (alpha, beta(+), beta(-)) results in daughter elements with altered ionization states.
    • These ionization changes can impact local defect concentrations and charge distributions within materials.

    Purpose of the Study:

    • To investigate the impact of radiotracer decay-induced ionization changes on diffusion measurements.
    • To quantify the potential errors introduced in apparent tracer diffusion rates.
    • To model the kinetic processes affecting diffusion measurements under these conditions.

    Main Methods:

    • Development of a kinetic model using four coupled equations.
    • Numerical methods were employed to solve the coupled equations.
    • Analysis of the influence of ionization state changes on vacancy concentrations and space charge.

    Main Results:

    • The study predicts significant deviations in apparent tracer diffusion rates.
    • Errors can range from factors of 2-3 under typical conditions.
    • Under specific circumstances, errors can escalate to an order of magnitude.

    Conclusions:

    • Radiotracer diffusion measurements require careful consideration of ionization effects from radioactive decay.
    • The inherent nature of radiotracer emission can lead to substantial inaccuracies in measured diffusion coefficients.
    • Accurate modeling of these kinetic effects is essential for reliable diffusion studies.