| TSC | technetium sulfur colloid; thiosemicarbazide; transverse spinal sclerosis; tuberous sclerosis |
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| sodium pertechnetate | Na 99mTcO4;a radiopharmaceutical used for brain, thyroid, and salivary gland scanning. (05 Mar 2000) |
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| technetium | <radiology> Tc-99m, half-life: 6.03 hr, decay: isomeric transition, radiation: gamma, 140 keV (98%) (12 Dec 1998) |
| technetium-99 | A radioisotope of technetium which is the decay product of technetium-99m and has a weak beta emission and a physical half-life of 213,000 years. (05 Mar 2000) |
| technetium compounds | Inorganic compounds that contain technetium as an integral part of the molecule. (12 Dec 1998) |