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Conducts experiments that led to the discovery of radioactivity.
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Of Britain discovers the electron while studying the cathode rays.
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Observes spontaneous denigration of radioactive elements into variants, became known as isotopes.
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Publish their theory of radioactive decay.
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Rutherford discovers that alpha rays are heavy and positive particles. Thomson proposes the "plum-pudding" model of the atom.
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Publishes the special theory of relativity regarding convertibility of matter and energy. E=mc2
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Conducts experiments that help discover the nucleus of the atom and disproving the 'plum-pudding' theory.
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Published first study on the injection of radium for therapy of various diseases.
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Bombard nitrogen gas with alpha particles and obtains atoms of an oxygen isotope and protons, being the first artificially induced nuclear reaction.
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Discovers neutrons.
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Concept of nuclear chain reaction discovered and idea of the atomic bomb was invented.
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Discover artificial radioactivity.
Enrico Fermi irridates uranium with neutrons and unknowingly achieve the first nuclear fission. -
Published his theory of mesons which explained the interaction between protons and neutrons, new field theory of nuclear forces
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Made the first clinical therapeutic application of an artificial radionuclide.
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President launches the Manhattan Project, a project for the secret creation of the atomic bomb.
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Produces first controlled and sustained nuclear fission reaction
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The United States explodes its first atomic bomb and drops the bomb, Little Boy, a uranium bomb, on Hirsoshima.
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began distribution of radioisotopes.
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Achieves its first nuclear chain reaction and detonates its first atomic bomb.
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Invented a photoreading system for radionuclide scanning.