Science assessment timeline
Category: Other
Updated: 5 May 2020
Contributors
Created byMatthew Lockwood
Attachments
Events
--1894--
Wilhelm Conrad Roentgen discovers X-rays--1898--
Marie and Pierre Curie report the discovery of radium.--1904--
In his initial work with X-rays, Clarence Madison Dally
(Thomas Edison’s assistant) is believed
to be the first person to die from
a radiation-induced malignancy.--1920--
-Rutherford theorises a neutron--1925 to 1930--
400,000 bottles of Radiothor, a potion containing radium that was said to
cure various health issues, including
stomach ulcers and impotence, are sold in the United States.--1930--
UV radiation becomes
recognized as a human carcinogen (cancers)--1945--
United States drops atomic bombs on Hiroshima and Nagasaki.
The Life Span Study of 94,000 survivors reports in 1997 that of approximately 9,300
cancer deaths, an estimated 5 percent are attributable to radiation exposure.--1979--
NASA collects its first satellite
data on ozone levels.--1896--
Becquerel discovers rays
emitted spontaneously
from uranium salts--1899--
Ernst Rutherford distinguishes
alpha and beta radiation, and discovers half-life--1909--
Rutherford discovers that most mass is
concentrated in a small nucleus--1932--
Chadwick identifies nuetrons--1938--
-Hann and Strassman split uranium atoms with neutrons
-Meitner and Frisch explain what is happening and call is fission--1939--
Fermi and Szilard measure neutron multiplication and conclude that a nuclear chain reaction is possible--1954--
-USS Nautilus Launches, the first
nuclear-powered submarine--1986--
Chernobyl Reactor 4
accident releases large
amounts of radiation
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