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The researches on the field of the radioactivity were a consequence of the discovery of the X-rays and theories on light and electromagnetic waves of Maxwell and Hertz, in fact, to examine these studies J.H. Poincaré (1854-1912) advised the physical Henri Becquerel (Paris 1852 - Le Croisic 1908) to determine whether there might be a connection between X-ray and phosphorescence-phluorescence. Becquerel using the salts of uranium discovered in 1896 the phenomenon of radioactivity by exposing the rays emitted from uranium to the magnetic field of an electromagnet, also found that these rays impressed the photographic plate, and for this reason were called precisely "Becquerel rays". By studying the properties of radiation experienced that some type were stopped by a sheet of aluminum, while others were more penetrating, and through further investigation it was discovered the so-called cathode rays.

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Telephone: +39 338 1809310 Date: 02/04/2011 article n°: 1544 _____________________________________________________________________________________________________