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In 1896, the French physicist Antoine Henri Becquerel discovered that uranium salts emit invisible radiation that blackens light-tight packaged photographic plates and discharges the charged capacitor plates. A year earlier, on December 28, 1895, Wilhelm ConradRöntgen published the manuscript "About a new kind of rays - preliminary communication", which gave a concise report on the discovery of X-rays. The work was translated into several languages within a short period of time. Further information on this topic can be found at the University of Würzburg. A little later (1898) the Curies isolated polonium and radium by processing several tons of pitchblende.
- Certain nuclides (atomic nuclei) have the property of spontaneously - without external influence - changing into other nuclei. Radiation is emitted (α-, β-radiation or γ-rays). This property is called radioactivity. The nuclei of such atoms are called radionuclides.
- Radionuclides are atoms whose nucleus decays. A distinction is made between natural and artificial radionuclides. Naturally occurring radionuclides are referred to as natural radioactivity, and both radionuclides generated by nuclear reactions are referred to as artificial radioactivity.
LiteratureWurm, T. ( December 2012):Chemistry for beginners and climbers. 1st edition Wiley-VCH Verlag GmbH & Co. KGaA, 357, ISBN: 978-3-527-33206-9