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Efficiency estimation for detecting U alpha particles in solid-state nuclear track detectors.

T Uda, H Iba

    Health Physics
    |September 1, 1985
    PubMed
    Summary
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    This study evaluated solid-state nuclear track detectors (LR-115 II and CR-39) for uranium detection. CR-39 showed minimal energy dependency, enabling accurate uranium quantification in aluminum and iron with high agreement to neutron-activation analysis.

    Area of Science:

    • Nuclear Physics
    • Materials Science
    • Analytical Chemistry

    Background:

    • Solid-state nuclear track detectors (SSNTDs) are crucial for alpha particle detection.
    • Cellulose nitrate (LR-115 II) and allyl diglycol carbonate (CR-39) are common SSNTD materials.
    • Accurate efficiency determination is vital for quantitative analysis.

    Purpose of the Study:

    • To investigate and compare the detection efficiencies of LR-115 II and CR-39 SSNTDs.
    • To determine the energy dependency of detection efficiency for alpha particles.
    • To estimate and validate uranium detection efficiencies in various metal matrices.

    Main Methods:

    • Experimental measurement of detection efficiency using a surface alpha source with varying detector-source distances.

    Related Experiment Videos

  • Calculation of alpha-particle incident efficiency.
  • Estimation of uranium detection efficiency in aluminum and iron based on absorber thickness and experimental data.
  • Quantification of uranium in ingots and comparison with neutron-activation analysis (NAA).

    • Main Results:

    • The detection efficiency ratio for LR-115 II was energy-dependent, while CR-39 showed minimal energy dependency.
    • Estimated detection efficiencies for uranium in aluminum and iron were 16% for LR-115 II and 22% for CR-39.
    • Uranium amounts determined using these efficiencies agreed with NAA results within 15% deviation.

    Conclusions:

    • CR-39 is a reliable SSNTD for uranium quantification due to its low energy dependency.
    • The proposed detection efficiencies allow for accurate determination of uranium in aluminum and iron matrices.
    • SSNTDs offer a viable alternative for uranium analysis, complementing techniques like NAA.