Half-life and Decay — Tech Evolutions

Entry	Year	Description	Impact
Discovery of Artificial Radioactivity (Joliot-Curie)	1934	Irène and Frédéric Joliot-Curie discovered that stable elements could be made radioactive by bombarding them with alpha particles, leading to the creation of new, unstable isotopes that then decayed. This 'artificial radioactivity' expanded the scope of nuclear physics beyond naturally occurring isotopes.	Opened the door for the production of a vast array of radioisotopes in laboratories and reactors, revolutionizing medicine, industry, and research. This led directly to the development of medical isotopes and tracers.
Development of Carbon-14 Dating (Willard Libby)	1949	Willard Libby developed the technique of radiocarbon dating, utilizing the known half-life of Carbon-14 to determine the age of organic materials. His method provided a revolutionary tool for archaeology, anthropology, and geology.	Provided a precise chronological framework for prehistoric periods, transforming our understanding of human history and environmental changes. Earned Libby the Nobel Prize in Chemistry in 1960.
Understanding of Nuclear Fission (Hahn, Strassmann, Meitner, Frisch)	1938-1939	The discovery of nuclear fission by Otto Hahn and Fritz Strassmann, and its theoretical explanation by Lise Meitner and Otto Frisch, revealed that heavy nuclei could split into lighter ones, releasing enormous amounts of energy. This process involves the decay of unstable heavy nuclei.	Led directly to the development of nuclear weapons and nuclear power, fundamentally altering global geopolitics and energy production. The half-lives of fission products became critical for reactor safety and waste management.