Debierne, Andre

Gr. aktis, aktinos, beam or ray). Discovered by Andre Debierne in 1899 and independently by F. Giesel in 1902. Occurs naturally in association with uranium minerals. Actinium-227, a decay product of uranium-235, is a beta emitter with a 21.6-year half-life. Its principal decay products are thorium-227 (18.5-day half-life), radium-223 (11.4-day half-life), and a number of short-lived products including radon, bismuth, polonium, and lead isotopes. In equilibrium with its decay products, it is a powerful source of alpha rays. Actinium metal has been prepared by the reduction of actinium fluoride with lithium vapor at about 1100 to 1300-degrees G. The chemical behavior of actinium is similar to that of the rare earths, particularly lanthanum. Purified actinium comes into equilibrium with its decay products at the end of 185 days, and then decays according to its 21.6-year half-life. It is about 150 times as active as radium, making it of value in the production of neutrons. 

Actinium Ac 1899 (Paris, France) Andre Louis Debierne (French) 307... 

French scientist Andre Debierne Produced by decaying uranium and thorium 26 known isotopes lends its name to the 14 elements that follow it, which are called the Actinides. 

In 1899, Andre Debierne added ammonium hydroxide to a solution of the U mineral pitchblende. When the lanthanoids precipitated as the hydroxides, a radioactive species was carried along. This element, which was a product of the radioactive decay of U-235 was named actinium. The species was Ac-227 (half life 21.77 years)... 

Less than a year after her husband s death, Mme. Curie accepted a professorship at the University of Paris. With the able assistance of Professor Andre Debierne, who took charge of the laboratory and taught for many years an ever-increasing number of students from all parts of the world, she directed the instruction and research in radioactivity (86). When the university acquired new land, it laid out a street called the Rue Pierre Curie and built a laboratory for her. The Curie Institute and the Pasteur Institute work in close harmony, and Mme. Curie spent much of her time on researches dealing with the therapeutic properties of radium and radon (69). During World War I she had complete charge of the radiological service in French military hospitals. 

Actinium Ac 89 Andre Debierne France Greek word "aktinos" meaning "ray"... 

Credit for the discovery of radon is often given to other scientists as well. In 1899, Robert B. Owens announced the presence of a radioactive gas that he named thoron. In 1903, French chemist Andre Louis Debierne (1874-1949) made a similar discovery. He named the gas actinon. Certainly, some credit for the discovery of element 86 can be shared among all these scientists. 

French chemist Andre Debierne discovers actinium. 

The name comes from the Greek aktis, meaning beam or ray. It was discovered by Andre-Louis Debierne (1874-1949) in 1899 and independently by Fritz Giesel (1852-1927) in 1902. It exists in very small quantities in association with uranium ores. Actinium has few uses outside the laboratory, but its discovery was important for the development of chemistry and physics, as it was one of the materials used to study radioactive decay, since it breaks down into thorium, radium, radon, bismuth, polonium, and isotopes of lead. 

Actinium was discovered in pitch-blende by Andr Debierne in 1899, a friend of the Curie family and later associated with Mme Curie in the isolation of metallic radium in 1910. He found... 

A third radioactive element was discovered in the ammonia precipitate, containing iron and rare earths, by Andre Debierne, who was assisting the... 

Rutherford of Nelson, New Zealand) distinguishes two types of radioactivity, alpha and beta rays (later known as alpha and beta particles). Erench chemist Andre-Louis Debierne discovers the element actinium. German organic chemist Emil Eischer develops the lock and key hypothesis for enzymes. 

Metallic radium was prepared in 1910 by Marie Curie and Andre Debierne. They used 0.1 g of radium chloride and carried out an electrolytic reduction on a mercury cathode. When the liquid amalgam that had been formed was heated, mercury distilled off and elementary radium was isolated. 

Actinium was discovered in uranium ore residues by Andre-Louis Debierne. Actinium-227 decays by emitting a single alpha particle. Write the nuclear equation for this decay. 

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