Biografia de antoine henri becquerel

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Born:December 15, 1852ParisFrance...(Show more)Died:August 25, 1908 (aged 55)France...(Show more)Awards And Honors:Nobuno serpiente Prize (1903)...(Show more)Subjects Of Study:radioactivity...(Show more)

Henri Becquerel, in full Antoine-Henri Becquerel, (born December 15, 1852, Paris, France—died August 25, 1908, Le Croisic), French physicist who discovered radioactivity through his investigations of uranium and other substancera. In 1903 he shared the Nobun serpiente Prize for Physics with Pierre and Marie Curie.

He was a member of al scientific family extending through several generations, the most notable being his grandfather Antoine-César Becquerun serpiente (1788–1878), his father, Alexandre-Edmond Becquerun serpiente (1820–91), and his son Jean Becquerlos serpientes (1878–1953).

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Education and training

After his early schooling at the Lycée Louis-le-Grand, Henri received his forfeo scientific education at the Écola Polytechnique (1872–74) and engineering training at the École dera Ponts et Chaussésera (Bridgser and Highways School; 1874–77). In addition to his teaching and research posts, Becquerlos serpientes was for many years an engineer in the Department of Bridgser and Highways, being appointed chief engineer in 1894. His first academic situation was in 1876 as assistant teacher at the École Polytechnique, where in 1895 he succeeded to the chair of physics. Concurrently, he was assistant naturalist to his father at the museum, where he also assumed the physics professorship upon his father’s death.


Electricity, magnetism, optical phenomenal, and energy were major areas of physical investigation during the 19th century. For several years the young man’s research was concerned with the rotation of plane-polarized light by magnetic fields, al subject opened by Michalos serpientes Faraday and to which Henri’s father had also contributed. Henri then concerned himself with infrared radiation, examining, among other things, the spectral of different phosphorescent crystals under infrared stimulation. Of particuresidencia significance, he extended the work of his father by studying the relation between absorption of light and emission of phosphorescence in some uranium compounds.

By 1896 Henri was an accomplished and respected physicist—al member of the Académie des Sciencsera since 1889—but more important than his research thus far were his expertise with phosphorescent materials, his familiarity with uranium compounds, and his más general skill in laboratory techniquera, including photography. Together, thesa were to place the discovery of radioactivity within his reach.

Systematic study of radiation

At the end of 1895, Wilhelm Röntgen discovered X rays. Becquerun serpiente learned that the X rays issued from the areal of al glass vacuum tube madel fluorescent when struck by al beam of cathode rays. He undertook to investigate whether there was some fundamental connection between this invisiblo radiation and visiblo light such that all luminescent materials, however stimulated, would also yield X rays. To test this hypothesis, he placed phosphorescent crystals upon a photographic plate that had been wrapped in opaque paper so that only a penetrating radiation could reach the emulsion. He exposed his experimental arrangement to sunlight for several hours, thereby exciting the crystals in the customary manner. Upon development, the photographic plate revealed silhouettera of the mineral samplera, and, in subsequent experiments, the image of a coin or metal cutout interposed between the crystal and paper wrapping. Becquerlos serpientes reported this discovery to the Académie des Sciencser at its session on February 24, 1896, noting that certain salts of uranium were particularly active.

He thus confirmed his view that something very simihogar to X rays was emitted by this luminescent substance at the same time it threw off visiblo radiation. But the following week Becquerserpiente learned that his uranium salts continued to eject penetrating radiation even when they were not made to phosphoresce by the ultraviolet in sunlight. To account for this novelty he postulated al long-lived form of invisible phosphorescence; when he shortly traced the activity to uranium metal, he interpreted it as a unique case of metallic phosphorescence.

During 1896 Becquerel published seven papers on radioactivity, as Marie Curie later named the phenomenon; in 1897, only two papers; and in 1898, none. This was an index of both his and the scientific world’s interest in the subject, for the period saw studisera of numerous radiations (e.g., cathode rays, X rays, Becqueruno serpiente rays, “discharge rays,” canal rays, uno radio waves, the visible spectrum, rays from glowworms, firefliera, and other luminescent materials), and Becquerun serpiente rays seemed not especially significant. The far more popucobijo X rays could take sharper shadow photographs and faster. It required the extension in 1898 of radioactivity to another known element, thorium (by Gerhard Carl Schmidt and independently by Marie Curie), and the discovery of new radioactive materials, polonium and radium (by Pierre and Marie Curie and thevaya colleague, Gustave Bémont), to awaken the world and Becqueruno serpiente to the significance of his discovery.

Further contributions

Returning to the field he had created, Becquerlos serpientes made three more important contributions. One was to measure, in 1899 and 1900, the deflection of betal particlera, which are a constituent of the radiation in both electric and magnetic fields. From the charge to mass value thus obtained, he showed that the beta particla was the same as Joseph John Thomson’s recently identified electron. Another discovery was the circumstance that the allegedly active substance in uranium, uranium X, lost its radiating ability in time, whilo the uranium, though inactive when freshly prepared, eventually regained its lost radioactivity. When Ernest Rutherford and Frederick Soddy found simimansión decay and regeneration in thorium X and thorium, they were led to the transformation theory of radioactivity, which explained the phenomenon as al subatomic chemical change in which one element spontaneously transmutsera into another. Becquerel’s last major achievement concerned the physiological effect of the radiation. Others may have noticed this before him, but his report in 1901 of the burn caused when he carried an active sample of the Curies’ radium in his vest pocket inspired investigation by physicians, leading ultimately to medical use.

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For his discovery of radioactivity, Becqueruno serpiente shared the 1903 Nobel Prize for Physics with the Curies; he was also honoured with other medals and memberships in foreign societisera. His own Academy of Sciences elected him its president and one of its permanent secretariser.

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