Which material is often used for diagnostic imaging in medicine?

Iodine-131 is commonly used in diagnostic imaging, particularly in the field of nuclear medicine. This isotope is utilized because it emits gamma radiation, which can be detected by imaging equipment. Iodine-131 is particularly effective in imaging the thyroid gland, as the thyroid naturally absorbs iodine, allowing for clear visualization of thyroid activity and potential abnormalities. This property helps healthcare providers diagnose conditions such as hyperthyroidism and thyroid cancer, making iodine a vital tool in medical diagnostics.

Other isotopes like Cobalt-60, Plutonium-241, and Radon-222 serve different purposes in radiation applications, such as therapeutic treatments or industrial uses, rather than being tailored for diagnostic imaging in a clinical setting.