Tc-97, or Technetium-97, is a radioactive isotope of the element Technetium. It has a half-life of about 2.6 million years, making it one of the longer-lived isotopes of this element. Tc-97 is produced through the decay of Molybdenum-97 and is primarily used in scientific research and nuclear medicine. In nuclear medicine, Tc-97 is not commonly used for imaging or treatment, unlike its more popular counterpart, Tc-99m. However, its long half-life makes it useful for studying geological processes and the behavior of radioactive materials in the environment.