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| As a tracer, radoisotopes are added to a system to study that system, be it a physical, chemical or biological system. |
Because radioisotopes have the same chemical properties as their stable isotopes, they can be used to characterize a compound so that the displacement of the compound can be monitored.
In medicine, radioactivity as a tracer is used to diagnose a disease suffered by a patient. For example Ti-201 which is used as a tracer of damage to the heart.