What advantage does Tc-99m have over other isotopes used in imaging?

• A. Longer half-life
• B. Higher energy emissions
• C. Better imaging resolution
• D. Shorter half-life and lower radiation dose

Answer: (D)

Technetium-99m (Tc-99m) is widely used in nuclear medicine and has distinct advantages that make it favorable compared to other isotopes. One of the most significant benefits is its shorter half-life, which is about 6 hours. This relatively short half-life means that the isotope decays quickly, leading to a lower radiation dose for the patient compared to isotopes with longer half-lives.

In imaging applications, this shorter duration helps to minimize the radiation exposure while still allowing adequate time for imaging procedures. As a result, patients receive less radiation, balancing diagnostic efficacy with safety. Additionally, Tc-99m's rapid decay means that the radiopharmaceuticals made from it can be produced fresh and used effectively within a short period of time, further enhancing patient safety.

These characteristics of Tc-99m are particularly advantageous in medical imaging, where minimizing radiation exposure is essential while still achieving high-quality diagnostics. Therefore, the shorter half-life combined with a lower radiation dose is pivotal in making Tc-99m a widely used and preferred choice in nuclear medicine.