A radiotracer is a small amount of radioactive material used in medical imaging and research to track biological processes in the body. By emitting radiation, it allows doctors to visualize organs and tissues, helping diagnose conditions such as cancer or heart disease. Common radiotracers include fluorodeoxyglucose (FDG) and technetium-99m. In addition to medical applications, radiotracers are also used in environmental studies and industrial processes. They can help trace the movement of substances in ecosystems or monitor the flow of materials in manufacturing. This versatility makes radiotracers valuable tools in both healthcare and scientific research.