Radioactive tracers are widely used in various fields such as medicine, environmental sciences, and engineering. These tracers help to trace the movement of certain substances or materials in a given system or organism. However, there are many synonyms that can be used for radioactive tracer, depending on the context. Some of these synonyms include radioactive marker, radioactive label, radiolabel, radiotracer, isotope tracer, and radioisotope tracer, among others. Regardless of the name used, these tracers play a crucial role in many fields, enabling scientists to study various processes and systems in a safe and effective manner.