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Concerning Tc-99m: a. It is the daughter nucleus of Mo-99 and is produced following the emission of gamma rays b. Tc-99m and Tc-99 differ in their half-lives c. It emits gamma rays with 140 keV d. Pertechnetate (TcO4-) is used in imaging to localize Meckel’s diverticulum e. It emits beta particles |
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Answer» a. False. The parent compound of Tc-99m is Mo-99, but it is produced following the emission of a negative beta particle. Tc-99m subsequently emits gamma rays to form its isomer Tc-99. b. True. Tc-99m and Tc-99 are isomers and differ in their half-lives and energy states. They have the same atomic and mass numbers. c. True. Tc-99m emits gamma rays with 140 keV, which are suitable for imaging. d. True. TcO4- is trapped in the thyroid gland and the salivary glands, but is also taken up by the gastric mucosa or by ectopic gastric mucosa (Meckel’s diverticulum). e. False. Tc-99m results in the emission of pure gamma rays. |
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