Rb sr dating wikipedia
However, rubidium ions have the same charge as potassium ions, and are actively taken up and treated by animal cells in similar ways.It is the second most electropositive of the non-radioactive alkali metals and melts at a temperature of 39.3 °C (102.7 °F).Hence, the Rb/Sr ratio in residual magma may increase over time, and the progressing differentiation results in rocks with elevated Rb/Sr ratios.The highest ratios (10 or more) occur in pegmatites.
With a half-life of 76 seconds, rubidium-82 decays by positron emission to stable krypton-82.
Rb, is one of the most commonly used atomic species employed for laser cooling and Bose–Einstein condensation.
Its desirable features for this application include the ready availability of inexpensive diode laser light at the relevant wavelength, and the moderate temperatures required to obtain substantial vapor pressures.
German chemists Robert Bunsen and Gustav Kirchhoff discovered rubidium in 1861 by the newly developed technique, flame spectroscopy.
Rubidium's compounds have various chemical and electronic applications.