Dorn, Friedrich Ernst

Dorn, Friedrich Ernst (1848-1916) German chemist who discovered the chemically almost inert, but medically dangerous, radioactive gaseous element radon, a noble gas, and showed that it arose as a decay product of radium. 

In 1861, Georg Hermann Quincke described a phenomenon that is the converse of electroosmosis When an electrolyte solution is forced through a porous diaphragm by means of an external hydrostatic pressure P (Fig. 31.1ft), a potential difference called the streaming potential arises between indicator electrodes placed on different sides of the diaphragm. Exactly in the same sense, in 1880, Friedrich Ernst Dorn described a phenomenon that is the converse of electrophoresis During... 

While studying radium, Friedrich Ernst Dorn (1848—1916) found that it gave off a radioactive gas that, when studied in more detail, proved to be the sixth noble gas. Dorn was given credit for its discovery in 1900. He called it radon, a variation of the word radium. Sir Wdham Ramsay and R. W. Whytlaw-Gray, who also investigated the properties of radon, called it niton from the Latin word nitens, which means shining. Several other scientists who worked with radon named it thoron because of the transmutation of radon-220 from the decay of thorium. However, since 1923, the gas has been known as radon because it is the radioactive decay gas of the element radium. The name is derived from the Latin word radius, which means ray. ... 

German physicist Friedrich Ernst Dorn Heavy, radioactive noble gas widely present results from uranium decay even present in soil highly toxic but valuable as a cancer treatment. 

Over the next decade, many scientists worked to find out more about radioactive materials. Curie and her husband, Pierre Curie (1859-1906), isolated two new radioactive elements, polonium and radium. In 1900, German physicist Friedrich Ernst Dorn (1848-1916) found a third radioactive element radon. 

German physicist Friedrich Ernst Dorn discovers radon. 

The reverse of electrophoresis occurs when small particles are allowed to fall through a liquid under the influence of gravity. A difference of potential is observed between two electrodes placed at different levels, and its magnitude again depends on the magnitude of the zeta potential. This phenomenon is known as the sedimentation potential or as the Dorn effect, after the German physicist Friedrich Ernst Dorn (1848-1916), who discovered it in 1880. 

Radon, named after the element radium, was discovered in 1900 by Friedrich Ernst Dorn in Germany. Radon is a radioactive gas found in high concentrations where soil and rocks contain uranium, graphite, shale, or phosphate or where soils may have been contaminated with by-products of uranium or phosphate mining. Some homes were built using sand-like uranium pulverized rock as construction material. 

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