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Residual activity of Tc-generators
European Journal of Nuclear Medicine
|January 1, 1981
Summary
Disposing of old 99Mo-99mTc generators is challenging due to long-lived radio-isotope contamination. However, a 3-month storage period significantly reduces activity, allowing for safe disposal.
Area of Science:
- Nuclear Chemistry
- Radiochemistry
- Medical Isotope Production
Background:
- Radioactive waste disposal presents challenges, particularly for medical isotope generators.
- Contamination by long-lived radio-isotopes in 99Mo-99mTc generators can hinder safe disposal.
Purpose of the Study:
- To identify and quantify long-lived radio-isotope impurities in an old 99Mo-99mTc generator.
- To assess the feasibility of safe disposal after a storage period.
Main Methods:
- Energy spectrum analysis to identify nuclides.
- Half-life measurements to determine the decay characteristics of impurities.
- Radioactive contamination assessment.
Main Results:
- Identified impurities including 46Sc, 51Cr, 60Co, 92mNb, 95Nb, and 124Sb.
- Determined that only 60Co has a half-life exceeding 3 months.
- Residual activity is significantly reduced after storage.
Conclusions:
- A moderately long storage period (over 3 months) is sufficient to reduce the activity of the identified radio-isotopes.
- Safe disposal of the 99Mo-99mTc generator is achievable after appropriate storage, mitigating disposal challenges.