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Rubidium - Isotopes | | Rubidium - Isotopes: Encyclopedia II - Rubidium - Isotopes | | There are 24 isotopes of rubidium known with naturally occurring rubidium being composed of just two isotopes; Rb-85 (72.2%) and the radioactive Rb-87 (27.8%). Normal mixes of rubidium are radioactive enough to expose photographic film in approximately 30 to 60 days.
Rb-87 has a half-life of 48.8×109 years. It readily substitutes for potassium in minerals, and is therefore fairly widespread. Rb has been used extensively in dating rocks; Rb-87 decays to stable strontium-87 by emission of a negative beta particle. During fra ...
See also:Rubidium, Rubidium - Notable characteristics, Rubidium - Applications, Rubidium - History, Rubidium - Occurrence, Rubidium - Isotopes, Rubidium - Precautions, Rubidium - Biological Effects | | | Rubidium, Rubidium - Applications, Rubidium - Biological Effects, Rubidium - History, Rubidium - Isotopes, Rubidium - Notable characteristics, Rubidium - Occurrence, Rubidium - Precautions | | |
| | | Rubidium: Encyclopedia II - Rubidium - Isotopes
Rubidium - Isotopes
There are 24 isotopes of rubidium known with naturally occurring rubidium being composed of just two isotopes; Rb-85 (72.2%) and the radioactive Rb-87 (27.8%). Normal mixes of rubidium are radioactive enough to expose photographic film in approximately 30 to 60 days.
Rb-87 has a half-life of 48.8×109 years. It readily substitutes for potassium in minerals, and is therefore fairly widespread. Rb has been used extensively in dating rocks; Rb-87 decays to stable strontium-87 by emission of a negative beta particle. During fractional crystallization, Sr tends to become concentrated in plagioclase, leaving Rb in the liquid phase. Hence, the Rb/Sr ratio in residual magma may increase over time, resulting in rocks with increasing Rb/Sr ratios with increasing differentiation. Highest ratios (10 or higher) occur in pegmatites. If the initial amount of Sr is known or can be extrapolated, the age can be determined by measurement of the Rb and Sr concentrations and the Sr-87/Sr-86 ratio. The dates indicate the true age of the minerals only if the rocks have not been subsequently altered. See Rubidium-Strontium dating for a more detailed discussion.
Other related archives1861, Ag, Atomic clocks, Bose-Einstein condensation, Gustav Kirchhoff, I, L, Lepidolite, Manitoba, O, Robert Bunsen, Rubidium-Strontium dating, US$, air, alkali metal, alloys, amalgams, armature, atmosphere, atomic number, batteries, beta particle, caesium, calcium, chemical element, conductivity, dating rocks, diode laser, earth, electric current, electricity, electropositive, fireworks, fractional crystallization, getter, glasses, gold, gram, half-life, hydrogen, ion engines, ionic crystal, isotope, isotopes, laser cooling, lepidolite, leucite, liquid, magma, magnetic field, magnetohydrodynamic, mercury, metal, mineral, mineral oil, minerals, oxide, pegmatites, periodic table, photocell, photographic film, plagioclase, potassium, potassium chlorides, purple, radioactive, reddish, reducing, room temperature, sodium, space vehicles, spectroscope, strontium, temperature, thermoelectric, vacuum, vacuum tubes, violet, wavelength, xenon, zinnwaldite
 Adapted from the Wikipedia article "Isotopes", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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