Molybdenum-99 (Mo-99) is a radioactive isotope used primarily in medical imaging. It decays into technetium-99m, which is a key component in various diagnostic procedures, including nuclear medicine scans. Mo-99 has a half-life of about 66 hours, making it suitable for producing technetium-99m in hospitals shortly before use. Mo-99 is typically produced in nuclear reactors through the fission of uranium-235. Its availability is crucial for healthcare, as it helps in diagnosing conditions such as cancer and heart disease. The production and supply of Mo-99 are closely monitored to ensure consistent access for medical facilities worldwide.