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Related Experiment Videos

Radiation damage to mouse testis cells from [99mTc] pertechnetate

T A Mian, N Suzuki, H J Glenn

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

    Intravenously administered technetium-99m (99mTc) pertechnetate caused significant biologic damage to mouse testes. This internal radiation exposure resulted in sperm count reduction comparable to external gamma irradiation.

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    Area of Science:

    • Nuclear medicine
    • Radiobiology
    • Toxicology

    Background:

    • Technetium-99m (99mTc) pertechnetate is a common radiopharmaceutical.
    • Understanding its potential toxicity is crucial for patient safety.

    Purpose of the Study:

    • To quantify the radiation dose to mouse testes from intravenously administered 99mTc pertechnetate.
    • To assess the biologic damage to mouse testes caused by this internal radiation exposure.

    Main Methods:

    • Radiation dose determined using thermoluminescent dosimeters and nuclide uptake calculations.
    • Biologic damage assessed by sperm head counts (hemacytometer and Coulter counter).
    • Comparison with external gamma irradiation from Cesium-137 (Cs-137).

    Main Results:

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    • Radiation dose measured at 4.9 rads per millicurie (mCi) of 99mTc.
    • A dose of 28 rads (from 5.8 mCi 99mTc) reduced sperm heads to 70% of control levels.
    • This biologic effect is comparable to 40 rads of external Cs-137 gamma radiation.

    Conclusions:

    • Internal 99mTc pertechnetate administration causes significant testicular damage in mice.
    • The biologic impact of internal 99mTc is at least as significant as external gamma irradiation.