A radioisotope of technetium which decays by isomeric transition, emitting an essentially monoenergetic gamma ray of 142 keV with a half-life of 6.01 hr. It is usually obtained from a radionuclide generator of molybdenum-99 and is used to prepare radiopharmaceuticals for scanning the brain, parotid, thyroid, lungs, blood pool, liver, heart, spleen, kidney, lacrimal drainage apparatus, bone, and bone marrow.
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... '50s, '60s, '70s, and '80s. Uranium extracted from spent nuclear fuels included low levels of transuranics (americium, neptunium, and plutonium), technetium-99, and uranium-236. The gaseous diffusion process concentrates these contaminants in the enriched uranium and decreases the levels in the ...
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