PMID: 11320753Apr 26, 2001Paper

Technetium-99m production for use in nuclear medicine

Medicinski pregled
J L Vucina

Abstract

Technetium-99m is the most important radioisotope used in nuclear medicine. Its routine application is ensured by introduction of 99Mo/99mTc generators. This paper reviews the present status and perspectives of different types of generators. Novelties in the production of either 99Mo for generators or directly 99mTc by using accelerators are also included. PRODUCTION OF 99MO IN NUCLEAR REACTORS AND 99MO/99MTC TYPES OF GENERATORS: The main source of 99Mo is a nuclear reactor. Nuclear reaction 99Mo(n, gamma)99Mo is rather simple, but the main disadvantage is a low specific activity of 99Mo. For routine production the nuclear reaction 235U(n,f)99Mo is used. It gives high yields of 99Mo of very high specific activity. However, its main disadvantages are high costs and generation of large quantities of highly radioactive waste. Depending on the separation method several types of generators were developed. The predominant is the chromatographic generator based on fission-produced 99Mo. Due to the disadvantages of (n,f)99Mo production, the alternatives based on (n, gamma)99Mo were developed. However, sublimation (except low temperature sublimation) and extraction generators at the present stage have no perspective. Only gel generators...Continue Reading

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