History of Nuclear MedicineIntroductionThe history of Nuclear Medicine has a lot of importance and has brought a significant improvement to today's medicine. Nuclear medicine has made gene therapy a success and has increased the chances of surviving cancer than before. According to medical historians, there is no true birth date for nuclear medicine and this is due to the multidisciplinary nature of nuclear medicine. However, there is an approximate range of his birth date, which is between 1934 and 1946. In 1934, artificial radioactivity was discovered, and in 1946, radionuclides were produced by Oak Ridge National Laboratory for medical use. Through this article, the following would be discussed; the achievements and major discoveries that contributed to the evolution of nuclear medicine, the important uses of nuclear medicine, and the growth and expansion of nuclear medicine outside of North America. Achievements The following dates are important achievements that have helped nuclear medicine improve and surpass goals that once seemed impossible to achieve.• In 1669, phosphorus was discovered by H. Brand. 4• In 1896, the mysterious rays of uranium were discovered by H. Becquerel. 2• In 1934, Frédéric Joliot-Curie and Irène Joliot-Curie discovered artificially produced radioisotopes, a discovery considered by historians to be the most significant milestone ever achieved by Nuclear Medicine. 1• In 1937 technetium-99m was discovered by C. Perrier and E. Segre. It is a radionuclide and was first discovered as an artificial element used to fill space number 43 in the periodic table. 1 • In 1939, strontium-89 was evaluated for use in the treatment of pain in cancer. 3• In 1938, the isotopes of iodine-131 and cobalt-60 were discovered by J. Livingood and G. Seaborg. 2• In 1946, radionuclides were produced by Oak Ridge National Laboratory.• In 1971, Nuclear Medicine was