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Elements that have isotopes that are useful in imaging and therapy.
Radiopharmaceuticals are basically drugs containing a radioactive atom that are used for either imaging or therapy. Ninety-five percent of radiopharmaceuticals are employed diagnostically, the rest therapeutically.
Designing radiopharmaceuticals involves combining the right radioisotope with a targeting molecule, in order to take it to the tumor. The selection of the targeting molecule depends upon the type of cancer. In the case of breast cancer, for example, a hormone molecule might be used.