Encyclopedia/1. The Cosmos & The Natural World/2. Physics & Chemistry/06. Nuclear Physics & Radioactivity • Curated by Admin Timeline.sg
From the discovery of radioactivity to modern fusion research, this timeline traces the key milestones in nuclear physics, including the understanding of atomic nuclei, fission, fusion, and isotopes.
Chronological Storyline (41 Milestones)
Nov 8, 1895 CE
Röntgen Discovers X-Rays
Wilhelm Röntgen discovers X-rays while experimenting with cathode rays, leading to the first Nobel Prize in Physics in 1901. This discovery spurred research into radioactivity. #nuclearphysics #science
Röntgen Discovers X-Rays By Erwin Hanfstaengl - https://global.museum-digital.org/singleimage?imagenr=2399678, Public domain, https://commons.wikimedia.org/w/index.php?curid=182243188
Mar 1, 1896 CE
Becquerel Discovers Radioactivity
Henri Becquerel discovers spontaneous radioactivity in uranium salts while investigating phosphorescence. This laid the foundation for nuclear physics. #radioactivity #physics
Becquerel Discovers Radioactivity By Paul Nadar / Adam Cuerden - This file comes from Gallica Digital Library and is available under the digital ID btv1b532297273/f1, Public domain, https://commons.wikimedia.org/w/index.php?curid=120421283
Jul 1, 1898 CE
Curie Discover Polonium and Radium
Marie and Pierre Curie isolate polonium and radium from pitchblende, discovering two new radioactive elements. Their work earned Marie Curie two Nobel Prizes. #radioactivity #chemistry
Curie Discover Polonium and Radium By Henri Manuel - cdn-images-1.medium.com, Public domain, https://commons.wikimedia.org/w/index.php?curid=61396200
Jan 1, 1899 CE
Rutherford Identifies Alpha and Beta Rays
Ernest Rutherford distinguishes two types of radiation from uranium: alpha and beta rays. This classification was crucial for understanding atomic structure. #nuclearphysics
Rutherford Identifies Alpha and Beta Rays By Bain News Service, publisher Restored by: Bammesk - Library of Congress Catalog: https://lccn.loc.gov/2014716719 Image download: https://cdn.loc.gov/service/pnp/ggbain/36500/36570v.jpg Original url: https://www.loc.gov/pictures/item/2014716719/, Public domain, https://commons.wikimedia.org/w/index.php?curid=112190894
Jan 1, 1900 CE
Villard Discovers Gamma Rays
Paul Villard discovers gamma rays while studying radium radiation. Gamma rays are highly energetic electromagnetic waves emitted from the nucleus. #radioactivity #physics
Villard Discovers Gamma Rays By Unknown author - https://data.bnf.fr/fr/13011462/paul_villard/, Public domain, https://commons.wikimedia.org/w/index.php?curid=4024296
Jan 1, 1903 CE
Rutherford and Soddy Propose Decay Theory
Ernest Rutherford and Frederick Soddy formulate the theory of radioactive decay, explaining that atoms naturally transmute into other elements. #nuclearphysics
Rutherford and Soddy Propose Decay Theory By Unknown author - http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1921/soddy.html, Public domain, https://commons.wikimedia.org/w/index.php?curid=18253606
Sep 27, 1905 CE
Einstein Publishes E=mc²
Albert Einstein derives mass-energy equivalence in his special relativity paper. This equation later explains the immense energy released in nuclear reactions. #physics #relativity
Einstein Publishes E=mc² By NASA and The Hubble Heritage Team (STScI/AURA) - HubbleSite: gallery, release., Public domain, https://commons.wikimedia.org/w/index.php?curid=102873
Mar 7, 1911 CE
Rutherford Discovers Atomic Nucleus
Through the gold foil experiment, Ernest Rutherford discovers the atomic nucleus, a dense positively charged core. This revolutionized atomic theory. #nuclearphysics
Jul 1, 1913 CE
Soddy Coins the Term 'Isotope'
Frederick Soddy introduces the concept of isotopes to explain variations in radioactive decay. This idea was crucial for understanding nuclear structure. #chemistry #nuclearphysics
Soddy Coins the Term 'Isotope' By Kjerish - This image has been extracted from another file, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=54378478
Jun 1, 1919 CE
Rutherford Achieves First Artificial Transmutation
Rutherford bombards nitrogen with alpha particles, converting it into oxygen. This marks the first artificial nuclear reaction. #nuclearphysics
Jan 1, 1920 CE
Rutherford Postulates the Neutron
Rutherford hypothesizes the existence of a neutral particle in the nucleus, later discovered as the neutron. #nuclearphysics
Rutherford Postulates the Neutron By No machine-readable author provided. Harp assumed (based on copyright claims). - No machine-readable source provided. Own work assumed (based on copyright claims)., CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=637381
Jan 1, 1928 CE
Gamow Explains Alpha Decay via Tunneling
George Gamow uses quantum tunneling to explain alpha decay, providing a theoretical foundation for nuclear physics. #quantumphysics #nuclearphysics
Gamow Explains Alpha Decay via Tunneling By NASA / WMAP Science Team - http://map.gsfc.nasa.gov/media/121238/ilc_9yr_moll4096.png, Public domain, https://commons.wikimedia.org/w/index.php?curid=23285693
Feb 27, 1932 CE
Chadwick Discovers the Neutron
James Chadwick discovers the neutron, a key component of atomic nuclei. This led to new possibilities for nuclear reactions. #nuclearphysics
Chadwick Discovers the Neutron By Los Alamos National Laboratory, Attribution, https://commons.wikimedia.org/w/index.php?curid=36283260
Apr 14, 1932 CE
Cockcroft-Walton Split the Atom
John Cockcroft and Ernest Walton use a proton accelerator to split lithium atoms, confirming Einstein's E=mc². #nuclearphysics
Cockcroft-Walton Split the Atom By Kestrel - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=62252362
Jan 1, 1934 CE
Joliot-Curie Discover Artificial Radioactivity
Irène and Frédéric Joliot-Curie create artificial radioactive isotopes by bombarding aluminum with alpha particles. #radioactivity #physics
Joliot-Curie Discover Artificial Radioactivity By Nobel Foundation - https://nobelprize.org/nobel_prizes/chemistry/laureates/1935/joliot-fred-bio.html, Public domain, https://commons.wikimedia.org/w/index.php?curid=6224428
Mar 22, 1934 CE
Fermi Induces Radioactivity with Neutrons
Enrico Fermi bombards uranium with neutrons, initially believing he has created transuranic elements. This work set the stage for fission. #nuclearphysics
Fermi Induces Radioactivity with Neutrons By Department of Energy-Office of Public Affairs, restored by Yann - This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing., Public domain, https://commons.wikimedia.org/w/index.php?curid=156854
Nov 1, 1935 CE
Yukawa Proposes the Pion
Hideki Yukawa predicts the existence of the pion (pi meson) to explain the strong nuclear force binding protons and neutrons. #nuclearphysics #physics
Yukawa Proposes the Pion By Nobel Foundation archive - nobelprize.org [1], Public domain, https://commons.wikimedia.org/w/index.php?curid=6182205
Dec 17, 1938 CE
Hahn and Strassmann Discover Nuclear Fission
Otto Hahn and Fritz Strassmann identify barium as a product of neutron bombardment of uranium, proving nuclear fission. #fission #nuclearphysics
Hahn and Strassmann Discover Nuclear Fission By Created by Fastfission in Illustrator. The SVG code is valid. This vector image was created with a text editor. Please do not replace the simplified code of this file with a version created with Inkscape or any other graphical vector graphics editor - Own work, Public domain, https://commons.wikimedia.org/w/index.php?curid=486924
Jan 6, 1939 CE
Meitner and Frisch Explain Fission
Lise Meitner and Otto Frisch explain fission as the splitting of the uranium nucleus, coining the term 'fission' and calculating energy release. #nuclearphysics
Meitner and Frisch Explain Fission By Harris & Ewing - https://www.nationalgeographic.com/science/article/nobel-prize-winners-laureates-charts-graphics-science, Public domain, https://commons.wikimedia.org/w/index.php?curid=159322196
Dec 2, 1942 CE
Chicago Pile-1 Achieves First Criticality
Enrico Fermi's team builds Chicago Pile-1, the first artificial nuclear reactor, achieving a self-sustaining chain reaction. #reactor #nuclearphysics
Chicago Pile-1 Achieves First Criticality By Melvin A. Miller of the Argonne National Laboratory - http://narademo.umiacs.umd.edu/cgi-bin/isadg/viewobject.pl?object=95120, Public domain, https://commons.wikimedia.org/w/index.php?curid=8147703
Jul 16, 1945 CE
Trinity Test: First Atomic Bomb
The Manhattan Project detonates the first atomic bomb in New Mexico, marking the dawn of the nuclear age. #atomicbomb #history )
Trinity Test: First Atomic Bomb By Jack W. Aeby, July 16, 1945, Civilian worker at Los Alamos laboratory, working under the aegis of the Manhattan Project. - This image comes from the Google-hosted LIFE Photo Archive where it is available under the filename 96ad5a9a5c94664e. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See the copyright section in the template documentation for more information., Public domain, https://commons.wikimedia.org/w/index.php?curid=140895
Aug 6, 1945 CE
Hiroshima Atomic Bombing
The United States drops 'Little Boy' on Hiroshima, killing tens of thousands and hastening the end of World War II. #atomicbomb #war
Hiroshima Atomic Bombing By George R. Caron / Charles Levy - Nagasakibomb.jpg Atomic_cloud_over_Hiroshima.jpg, Public domain, https://commons.wikimedia.org/w/index.php?curid=12204929
Aug 29, 1949 CE
Soviet Union Tests First Atomic Bomb
The USSR detonates its first atomic bomb (Joe-1), escalating the nuclear arms race. #coldwar #nuclearweapons
Dec 20, 1951 CE
EBR-I Generates First Nuclear Electricity
The Experimental Breeder Reactor I in Idaho produces the first electricity from nuclear power, lighting four light bulbs. #nuclearpower
EBR-I Generates First Nuclear Electricity By Orange Suede Sofa - Own work by the original uploader, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=52391609
Nov 1, 1952 CE
First Hydrogen Bomb: Ivy Mike
The US tests the first thermonuclear weapon (hydrogen bomb) on Enewetak Atoll, achieving multi-megaton yield. #fusion #weapons
First Hydrogen Bomb: Ivy Mike By USDE - Trinity and Beyond: The Atomic Bomb Movie, Public domain, https://commons.wikimedia.org/w/index.php?curid=129318165
Jun 27, 1954 CE
First Nuclear Power Plant (Obninsk) Goes Online
The Obninsk Nuclear Power Plant in the USSR becomes the first grid-connected nuclear power station, generating about 5 MW. #nuclearpower
First Nuclear Power Plant (Obninsk) Goes Online By Pavel Bykov / Павел Быков - RIA Novosti archive, image #409173, http://visualrian.ru/ru/site/gallery/#409173 Digital / Цифра, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=16787574
Aug 27, 1956 CE
Calder Hall: First Commercial Nuclear Station
Calder Hall in the UK opens as the first commercial nuclear power station, producing electricity for the national grid. #nuclearpower
Calder Hall: First Commercial Nuclear Station By UK government agencies - https://nda.blog.gov.uk/wp-content/uploads/sites/165/2019/09/Calder-Request-002.jpgDesc: https://nda.blog.gov.uk/tag/sellafield-ltd/, OGL 3, https://commons.wikimedia.org/w/index.php?curid=82153599
Jan 15, 1957 CE
Wu Observes Parity Violation in Beta Decay
Chien-Shiung Wu's experiment confirms that parity is violated in weak interactions, revolutionizing particle physics. #physics #nuclearphysics
Wu Observes Parity Violation in Beta Decay By Smithsonian Institution - Flickr: Chien-shiung Wu (1912-1997), No restrictions, https://commons.wikimedia.org/w/index.php?curid=18759827
Jul 29, 1957 CE
IAEA Founded
The International Atomic Energy Agency is established to promote peaceful use of nuclear energy and prevent proliferation. #nuclearpolicy
IAEA Founded By International Atomic Energy Agency: IAEA emblem Derivative Work: Jesuiseduardo - Documents and Website of the IAEA, Public domain, https://commons.wikimedia.org/w/index.php?curid=74753124
Jan 1, 1958 CE
First Tokamak (T-1) Built in USSR
Soviet scientists develop the first tokamak, a magnetic confinement fusion device, laying the groundwork for controlled fusion research. #fusion
First Tokamak (T-1) Built in USSR By Chen, S., Villone, F., Xiao, B. et al. - Chen, S., Villone, F., Xiao, B. et al. 3D passive stabilization of n = 0 MHD modes in EAST tokamak. Sci Rep 6, 32440 (2016). Figure 1, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=102602593
Oct 16, 1964 CE
China Tests First Atomic Bomb
China detonates its first nuclear weapon (Project 596), becoming the fifth nuclear-armed state. #nuclearweapons )
China Tests First Atomic Bomb By 《人民画报》 - 《人民画报》1965年第1期, Public domain, https://commons.wikimedia.org/w/index.php?curid=65155282
Jun 17, 1967 CE
China Tests First Hydrogen Bomb
China successfully tests a thermonuclear weapon (Test No. 6), demonstrating advanced nuclear capability. #fusion
China Tests First Hydrogen Bomb By Unknown author - https://www.ctbto.org/uploads/pics/China_H-bomb_1967.jpg, Public domain, https://commons.wikimedia.org/w/index.php?curid=97713003
Jan 1, 1968 CE
T-3 Tokamak Achieves High Temperatures
The Soviet T-3 tokamak reaches electron temperatures of around 1 keV, prompting global interest in magnetic fusion. #fusion
May 18, 1974 CE
India Tests First Nuclear Device (Smiling Buddha)
India conducts its first nuclear test ('Smiling Buddha'), becoming the sixth nuclear weapon state. #nuclearweapons
Apr 26, 1986 CE
Chernobyl Nuclear Disaster
A catastrophic explosion at the Chernobyl Nuclear Power Plant in Ukraine releases massive radioactive contamination, the worst nuclear accident in history. #disaster #nuclearpower
Chernobyl Nuclear Disaster By IAEA Imagebank - 02790015, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=63251598
Nov 9, 1991 CE
JET Achieves First Controlled Fusion Power
The Joint European Torus (JET) produces 16 MW of fusion power in a deuterium-tritium plasma, a major milestone for fusion energy. #fusion
Jan 1, 1998 CE
ITER Agreement Reached
International partners agree to build ITER, the world's largest tokamak, to demonstrate sustained fusion power. #fusion
ITER Agreement Reached By Rfassbind - Own work., Public domain, https://commons.wikimedia.org/w/index.php?curid=32503440
Jan 1, 2002 CE
National Ignition Facility Construction Begins
Construction starts on the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory, using lasers for inertial confinement fusion. #fusion
National Ignition Facility Construction Begins By Lawrence Livermore National Security - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=19898650
Mar 11, 2011 CE
Fukushima Daiichi Nuclear Disaster
A massive earthquake and tsunami cause meltdowns at Japan's Fukushima Daiichi plant, leading to widespread radioactive release and a rethinking of nuclear safety. #disaster #nuclearpower
Fukushima Daiichi Nuclear Disaster By Digital Globe - Earthquake and Tsunami damage-Dai Ichi Power Plant, Japan, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=14630274
Dec 5, 2022 CE
NIF Achieves Net Energy Gain in Fusion
The National Ignition Facility achieves a fusion reaction producing more energy than the laser input, a historic breakthrough toward fusion energy. #fusion #energy
Jan 1, 2023 CE
ITER Construction Continues
ITER in France progresses toward first plasma, aiming to demonstrate sustained fusion as a viable energy source. #fusion
