Technetium

Uses

Technetium’s overwhelming real-world importance is in medicine. The isotope technetium-99m emits a form of radiation that’s easy to detect externally, decays away quickly, and can be attached to different carrier molecules that target specific organs or tissues. Injected in small, carefully calculated doses, it’s used in a huge share of nuclear medicine imaging scans worldwide, helping doctors examine bone health, heart function, and other conditions without invasive procedures.

Outside medicine, technetium has essentially no practical use. Because every isotope is radioactive, it’s produced only in the small quantities needed for research and healthcare, and it plays no role in construction, manufacturing or everyday products the way many other transition metals do.

History

Technetium’s existence was actually predicted decades before it was found, since Mendeleev’s periodic table left a gap for an undiscovered element between molybdenum and ruthenium. Several premature discovery claims were made and later disproven, until 1937, when Italian physicists Carlo Perrier and Emilio Segrè examined a sample of molybdenum that had been bombarded with deuterons in Ernest Lawrence’s cyclotron at Berkeley. They identified a new element that hadn’t been extracted from any natural source but had instead been created directly through nuclear reactions. They named it technetium, from the Greek word technetos, meaning artificial, marking it as the first element in history to be made by humans before ever being found in nature.