Uranium radioactivity

Chemists of the early twentieth century tried to find the existence of element 85, which was given the name eka-iodine by Mendeleev in order to fill the space for the missing element in the periodic table. Astatine is the rarest of all elements on Earth and is found in only trace amounts. Less than one ounce of natural astatine exists on the Earth at any one time. There would be no astatine on Earth if it were not for the small amounts that are replenished by the radioactive decay process of uranium ore. Astatine produced by this uranium radioactive decay process soon decays, so there is no long-term build up of astatine on Earth. The isotopes of astatine have very short half-lives, and less than a gram has ever been produced for laboratory study. 

Intake duration Effect Highly eniched uranium radioactivity concentration Natural uranium mass equivalent Depleted uranium mass equivalent Threshold Limit Value S... 

Barton L. L., Choudhury K, Thompson B., Steenhoudt K., and Groffman A. R. (1996) Bacterial reduction of soluble uranium the first step of in situ immobilization of uranium. Radioact. Waste Manage. Environ. Restor. 20, 141-151. 

Radon is continually produced in small amounts in the uranium radioactive decay sequence (Section 26-11). Radon gas is so unreactive that it eventually escapes from the soil. Measurable concentrations of radon, a radioactive gas, have been observed in basements of many dweUings. 

After the discovery of uranium radioactivity by Henri Becquerel in 1896, uranium ores were used primarily as a source of radioactive decay products such as Ra. With the discovery of nuclear fission by Otto Hahn and Fritz Strassman in 1938, uranium became extremely important as a source of nuclear energy. Hahn and Strassman made the experimental discovery Lise Meitner and Otto Frisch provided the theoretical explanation. Enrichment of the spontaneous fissioning isotope U in uranium targets led to the development of the atomic bomb, and subsequently to the production of nuclear-generated electrical power. There are considerable amounts of uranium in nuclear waste throughout the world, see also Actinium Berkelium Einsteinium Fermium Lawrencium Mendelevium Neptunium Nobelium Plutonium Protactinium Rutherfordium Thorium. 

Becqnerel discovers radiation from uranium (radioactivity). The intensity of the radiation is measured either through its ionization of air or through the scintillations observed when the radiation hits a fluorescent screen. 

Uranium Radioactive metallic substance, and one of the most abundant elements found in nature, used to produce the fissile isotope uranium-235 (U-235), the principal fuel of nuclear reactors. 

In addition to the normal radioactivity of radium, thorium, polonium, and uranium, radioactivity may be induced in these elements. The cyclotron has made it possible to obtain high-energy particles in considerable concentrations, and so it may be anticipated that artificial radio elements will become increasingly accessible to research workers. It is for this reason... 

When uranium-238 decays it undergoes a series of 14 alpha and beta decays. This series of steps is known as the uranium radioactive decay series. Helium gas is released (due to the eight beta decays) and the final product is stable lead-206. For every uranium-238 atom that decays, one atom of lead-206 is produced at the end of the decay series. 

Polonium occurs three times in the course of the uranium radioactive decay series. Polonium-210 decays via alpha emission with a half-life of 138.4 days. Write an equation for its decay. 

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