Answer:
The scientist most essential to the use of radioactive isotopes in medicine is George de Hevesy. George de Hevesy was a Hungarian chemist who won the Nobel Prize in Chemistry in 1943 for his work on the use of isotopes as tracers in the study of chemical processes. He developed the technique of using radioactive isotopes, such as radioactive forms of elements like iodine and phosphorus, to track and visualize biological processes within the body.
De Hevesy's work laid the foundation for the field of nuclear medicine, where radioactive isotopes are widely used for diagnostic imaging, cancer treatments, and other medical applications. By incorporating radioactive isotopes into various compounds, it became possible to trace their movement within the body, helping physicians and researchers better understand physiological processes and diagnose diseases.