Chronology of Milestone Events in Particle Physics - BECQUEREL 1896B
Chronology of Milestone Events in Particle Physics

  Nobel prize to H. Becquerel awarded in 1903 "for his discovery of spontaneous radioactivity''. Co-winners M. Curie and P. Curie "for their joint researches on the radiation phenomena discovered by Becquerel''  


Becquerel, H.;
Sur les Radiations Invisibles Emises par les Corps Phosphorescents / On the Invisible Radiation Emitted by Phosphorescent Substances
Compt. Ren. 122 (1896) 501;

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Reprinted in
(translation into English) A. Romer, The discovery of radioactivity and transmutation, Dover, New York 1964.
(translation into English, excerpt) The WORLD of the ATOM, editors H. A. Boorse and L. Motz, Basic Books, New York - London, V.I (1966) 405.

At the last session I sketched briefly the experiments I had been led to perform in order to demonstrate the invisible radiations emitted by certain phosphorescent substances, radiations which penetrate various substances which are opaque to light.
I have been able to extend these observations, and, although I propose to continue and develop the study of these phenomena, their present interest leads me to set forth as early as today the first results I have obtained.
The experiments I shall report were made with the radiations emitted by crystalline lamellas of the double sulfate of potassium and uranium [K(UO)SO4 + H2O], a substance whose phosphorescence is very lively and whose persistence of luminosity is less than 1/100 of a second.

Accelerator SOURCE Detectors EMUL

Related references
More (earlier) information appears in
H. Becquerel, Compt. Ren. 122 (1896) 420;

  U unspec X

Particles studied
  unspec ex

Record comments
Evidence for spontaneous radioactivity effect.
  New Comments List of Comments NY