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Create a Timeline
History of Radiation Timeline
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Events
Wilhelm Konrad Roentgen discovers x‑rays.
1895
% complete
Antoine-Henri Becquerel discovers rays produced by uranium, the first observation of natural radioactivity.
1896
% complete
Concerns first raised about possible injuries from x‑ray exposures. Elihu Thomson conducts experiments on x‑ray burns.
1896
% complete
Marie and Pierre Curie discover polonium and announce the existence of another new radioactive element they name radium.
1898
% complete
Marie and Pierre Curie discover that thorium gives off "uranium rays," which Marie renames "radioactivity."
1898
% complete
Paul Ulrich Villard discovers gamma rays
1898
% complete
Ernst Rutherford discovers that radioactivity from uranium has at least two different forms, which he calls alpha and beta rays.
1899
% complete
Rutherford discovers the principle of half-life and sets forth his laws on radioactive decay.
1900
% complete
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