The radioactive decay of rubidium-87 (87Rb) to strontium-87 (87Sr) was the first widely used dating system that utilized the isochron method. Rubidium is a relatively abundant trace element in Earths crust and can be found in many common rock-forming minerals in which it substitutes for the major element potassium.
What is rubidium strontium dating used for?
Rubidium-strontium dating, method of estimating the age of rocks, minerals, and meteorites from measurements of the amount of the stable isotope strontium-87 formed by the decay of the unstable isotope rubidium-87 that was present in the rock at the time of its formation.
What is strontium-87 used for?
Strontium isotopic ratios are widely used as tracers in geological processes and as indicators of provenance in an archaeological context. A significant fraction of the Earths 87Sr is not primordial, but is produced by the decay of 87Rb.
What are the uses for Rubidium-87?
Rubidium-87 is a radioactive isotope is used to determine the age of old rocks. It has a half-life of 49 billion years. It is also used as a frequency standard in high-accuracy timing equipment such as GPS receivers. It is also used to produce Bose-Einstein condensates and in laser cooling.
What is the half-life of strontium 87?
Periodic Table--Strontium. The alkali earth metal strontium has four stable, naturally occurring isotopes: 84Sr (0.56%), 86Sr (9.86%), 81Sr (7.0%) and 88Sr (82.58%). Only 87Sr is radiogenic; it is produced by decay from the radioactive alkali metal 87Rb, which has a half-life of 48,800,000 years.
How many p/n e are in SR 84 how many are in the average Sr?
The alkaline earth metal strontium (38Sr) has four stable, naturally occurring isotopes: 84Sr (0.56%), 86Sr (9.86%), 87Sr (7.0%) and 88Sr (82.58%). Its standard atomic weight is 87.62(1) .List of isotopes.EC:Electron capturep:Proton emission2 more rows
Which is the oldest mineral on Earth?
zircon mineral Oldest terrestrial material The oldest material of terrestrial origin that has been dated is a zircon mineral of 4.404 ±0.008 Ga enclosed in a metamorphosed sandstone conglomerate in the Jack Hills of the Narryer Gneiss Terrane of Western Australia.
What percentage of rubidium-87 will remain after 5 half lives?
The original substance is callled the parent isotope and the decay product is the daughter isotope. Since 25% of the Rubidium-87 remains, approximately two half-lives have passed. After one half-life about 50% remains, and after a second half-life 50% of that 50% which is 25% remains.
What is the half-life of rubidium-87 is about 48.8 billion years?
RADIOMETRIC TIME SCALEParent IsotopeStable Daughter ProductCurrently Accepted Half-Life ValuesThorium-232Lead-20814.0 billion yearsRubidium-87Strontium-8748.8 billion yearsPotassium-40Argon-401.25 billion yearsSamarium-147Neodymium-143106 billion years2 more rows•13 Jun 2001