Which isotopes are commonly used for imaging in nuclear medicine?

The choice of Technetium-99m and Iodine-123 for imaging in nuclear medicine is based on their favorable physical and chemical properties.

Technetium-99m is the most widely used isotope in the field of nuclear medicine due to its ideal half-life of approximately 6 hours, which allows it to be used for imaging without posing a prolonged radiation risk to the patient. Its gamma emissions are in the optimal energy range for detection by gamma cameras, making it excellent for various diagnostic imaging procedures, including those of the heart, bones, and various organs. Additionally, Technetium-99m can be easily chelated to different molecules to image different pathological conditions.

Iodine-123 is another isotope utilized for imaging, particularly in thyroid studies. It has a half-life of about 13 hours, which is also conducive for imaging, and emits gamma radiation that is ideal for capturing high-resolution images. Its biological behavior closely mimics that of stable iodine, which allows for effective imaging of thyroid function.

In contrast, the other isotopes listed in the incorrect choices are not typically used for imaging in nuclear medicine. Carbon-14, Strontium-90, Cobalt-60, Sodium-24, and Cesium-