Tc-98, or Technetium-98, is a radioactive isotope of the element Technetium. It has a half-life of about 4.2 million years, making it one of the longer-lived isotopes of Technetium. Tc-98 is produced through the decay of Molybdenum-98 and is primarily used in scientific research and nuclear studies. This isotope emits beta particles during its decay process, which can be detected and measured. While Tc-98 is not commonly used in medical applications like some other Technetium isotopes, its stability and properties make it valuable for understanding nuclear reactions and the behavior of radioactive materials.