Technetium-99m

Infobox isotope

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The first technetium-99m generator, 1958

General	|- | Symbol | Tc |- | Atomic Number | |- | Atomic Mass | |- | Neutrons | |- | Protons | |- | Nuclide Data |- | Half-life | 6.01 hours |- | Decay mode | |- | Daughter isotopes | |- | Spin | |- | Excess energy | |- | Binding energy |

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Technetium-99m (Tc-99m) is a metastable nuclear isomer of technetium-99 (Tc-99), which is used in a wide variety of nuclear medicine diagnostic procedures. It is one of the most commonly used radioisotopes in the field due to its ideal physical and chemical properties.

Properties

Technetium-99m has a half-life of approximately 6.01 hours, which is long enough to conduct diagnostic tests but short enough to minimize radiation exposure to the patient. It decays by isomeric transition to Tc-99, emitting a gamma ray with an energy of 140 keV, which is ideal for detection by gamma cameras.

Production

Tc-99m is produced from the decay of molybdenum-99 (Mo-99), which is typically generated in nuclear reactors. Mo-99 decays to Tc-99m with a half-life of about 66 hours. The Tc-99m is then extracted from a technetium-99m generator, which is a device that allows for the separation of Tc-99m from Mo-99.

Injection of Tc-99m for a diagnostic procedure

Applications in Medicine

Tc-99m is used in a variety of diagnostic tests, including:

• Bone Scans: Tc-99m is used to detect bone metastases and other bone abnormalities.
• Cardiac Imaging: It is used in myocardial perfusion imaging to assess blood flow to the heart muscle.
• Renal Imaging: Tc-99m is used to evaluate kidney function and structure.
• Thyroid Scans: It helps in assessing thyroid gland function and detecting abnormalities.

Thyroid scan using Tc-99m before and after radioiodine therapy

Safety and Handling

While Tc-99m is generally considered safe due to its short half-life and the low energy of its gamma emissions, proper precautions must be taken to minimize radiation exposure to both patients and healthcare workers. This includes using the smallest effective dose and employing shielding and distance techniques.

Also see

• Nuclear medicine
• Radioisotope
• Gamma camera
• Molybdenum-99
• Radiopharmaceutical