• Monazite contains radioactive isotopes. (coinandbullionpages.com)
  • Because of the specificity of its uptake by the human body, radioactive isotopes of iodine can also be used to treat thyroid cancer . (wikipedia.org)
  • In any case, sufficient space for placing a variety of control keys scroll down and up, Radioactive isotope, also called radioisotope, radionuclide, or radioactive nuclide, any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays. (phuongngoccaibe.com)
  • Promethium-145 is the most stable promethium isotope, but the only isotope with practical applications is promethium-147, chemical compounds of which are used in luminous paint, atomic batteries and thickness-measurement devices. (wikipedia.org)
  • 153 Eu is a stable isotope, however 151 Eu decays very slowly, giving off alpha particles. (coinandbullionpages.com)
  • Sodium is a pure element whose only stable isotope 23 is Na. (zxc.wiki)
  • Cerium, lanthanum, neodymium, and praseodymium, commonly in the form of a mixed oxide known as mischmetal, are used in steel making to remove impurities and in the production of special alloys. (knowinsiders.com)
  • Hoffman chose to look for plutonium in these ores since she expected that the geochemistry of plutonium dioxide would be very similar to the geochemistry of thorium dioxide and cerium dioxide minerals, both of which are significant constituents of most lanthanide ores. (atomicinsights.com)
  • Another fissile isotope, uranium-233 , can be produced from natural thorium and is studied for future industrial use in nuclear technology. (wikimili.com)
  • The two sources of natural promethium are rare alpha decays of natural europium-151 (producing promethium-147) and spontaneous fission of uranium (various isotopes). (wikipedia.org)
  • The most common isotopes in natural uranium are uranium-238 (which has 146 neutrons and accounts for over 99% of uranium on Earth) and uranium-235 (which has 143 neutrons). (wikimili.com)
  • It occurs naturally in low concentrations of a few parts per million in soil, rock and water, and is commercially extracted from uranium-bearing minerals such as uraninite . (wikimili.com)
  • Uranium-235 is the only naturally occurring fissile isotope , which makes it widely used in nuclear power plants and nuclear weapons . (wikimili.com)
  • However, because of the extreme scarcity of concentrations of uranium-235 in naturally occurring uranium (which is, overwhelmingly, mostly uranium-238), uranium needs to undergo enrichment so that enough uranium-235 is present. (wikimili.com)
  • only approximately 25 grams occur naturally on the planet at any given time. (knowinsiders.com)
  • it is extremely rare, with only about 500-600 grams naturally occurring in Earth's crust at any given time. (wikipedia.org)
  • The point of this article is to discuss the psychological and practical relationship of plutonium's existence to the probability of nuclear war. (atomicinsights.com)
  • In sufficient concentration, these isotopes maintain a sustained nuclear chain reaction . (wikimili.com)
  • It has an atomic number of 38, an atomic mass of 88, one oxidation state (+2) and four naturally occurring isotopes ( 84 Sr, 86 Sr, 87 Sr, 88 Sr), of which 88 Sr is the most abundant at 82.6% of the total mass. (byjus.com)
  • sixth highest of the naturally occurring elements, only tantalum , osmium , rhenium , tungsten , and carbon have higher melting points. (knowpia.com)
  • The half-life of this decay varies between 159,200 and 4.5 billion years for different isotopes , making them useful for dating the age of the Earth . (wikimili.com)
  • This low-temperature alpha form converts into a beta, body-centered cubic (bcc) phase upon heating to 890 °C. Promethium belongs to the cerium group of lanthanides and is chemically very similar to the neighboring elements. (wikipedia.org)
  • The sulfate is slightly soluble, like the other cerium group sulfates. (wikipedia.org)
  • Despite always occurring in combination with the other rare-earth elements in minerals such as those of the monazite and bastnäsite groups, cerium is easy to extract from its ores, as it can be distinguished among the lanthanides by its unique ability to be oxidized to the +4 state in aqueous solution. (wikizero.com)
  • Today, cerium and its compounds have a variety of uses: for example, cerium(IV) oxide is used to polish glass and is an important part of catalytic converters . (wikizero.com)
  • This low-temperature alpha form converts into a beta, body-centered cubic (bcc) phase upon heating to 890 °C. Promethium belongs to the cerium group of lanthanides and is chemically very similar to the neighboring elements. (wikipedia.org)
  • Of important economic and practical interest are rare earth elements (REEs), which include the lanthanides, scandium and yttrium. (nature.com)
  • Cerium was the first of the lanthanides to be discovered, in Bastnäs , Sweden. (wikizero.com)
  • Cerium has no known biological role in humans but is not particularly toxic, except with intense or continued exposure. (wikizero.com)
  • For practical reasons, we will limit the abundance of these finds, which Dr Peter Plichta was allowed to bring to light , to a handful of excellent examples, e.g. the chemical periodic system. (submission.org)
  • All chemical elements have two or more isotopes. (gw-project.org)
  • Aluminium isotopes have found practical application in dating marine sediments, manganese nodules, glacial ice, quartz in rock exposures, and meteorites. (scientificlib.com)
  • Cerium is the second element of the lanthanide series. (wikizero.com)