Radium also is a dangerous material prolonged exposure to even small amounts may cause cancer, anemia, or other disorders. The small amount of the element present in any ore and the difficulty of extraction make it expensive.
It is recovered as the bromide by an involved chemical process.
Radium is usually obtained (with barium impurities) in residues from the production of uranium. Radium is present in all uranium minerals and is widely distributed in small amounts. Although some radium is obtained from carnotite from Colorado, the chief sources are carnotite from Congo (Kinshasa) and pitchblende from W Canada. Its compounds are found in uranium ores there is usually about 1 part of radium to 3 million parts of uranium in these ores. Radium decreases in radioactivity about 1% in 25 years. The curie is a unit of radioactivity defined as that amount of any radioactive substance that has the same disintegration rate as 1 gram of radium-226, i.e., 3.7×10 10 disintegrations per sec. In its radioactive decay radium emits alpha, beta, and gamma rays and also produces heat (about 1,000 calories per gram per year).
#Isolated radium in 1910 series
It is a product in the radioactive decay series of uranium-238 it is immediately preceded in this series by thorium-230 and followed by radon-222 (a gas formerly called radium emanation). Sixteen isotopes of radium are known, but only radium-226 (half-life 1,599 years), the most stable of the isotopes, is used commercially. Radium is also used as a neutron source (mixed with beryllium) and as a gamma-ray source. Mixed with a phosphor such as zinc sulfide, radium compounds are used in luminous paints. The most important property of radium and its compounds is their radioactivity radiotherapy is used in medicine in the treatment of cancer. It reacts with acids to form the commercially important chloride and bromide. It combines directly with water to form the hydroxide. When radium is exposed to air, a black coating of nitride rapidly forms. It is an alkaline-earth metal in its chemical properties it closely resembles barium, the element above it in Group 2 of the periodic table. Radium is a lustrous white radioactive metal. 88 mass number of most stable isotope 226 m.p. Radium rā´dēəm, radioactive metallic chemical element symbol Ra at.
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