Iodine xenon dating website

They can be studied in the laboratory by laser extraction noble and gas mass spectrometry to reveal the history of energetic particle exposure prior to meteorite formation 4.6 billion years age.

iodine xenon dating website-62

Grenville Turner is best known for his use of isotopes in the investigation of Solar System history.

He invented (with Craig Merrihue) the argon-40/argon-39 method of radioactive dating and pioneered its application to terrestrial and extraterrestrial samples.

With production rates monitored by radioactive krypton-81 and the integrated effects determined by the stable spallation products, surface exposure ages can be obtained without prior knowledge of specific production rates.

This method established the age of lunar craters North Ray and South Ray as 50 and 2 million years, respectively, and Tycho as 100 million years.

By this method, Grenville obtained the first precise potassium/argon ages of the Apollo rocks, on which the remarkably complete chrononology of the early events in lunar history has been based, especially the early bombardment and basin formation, and the evolution of mare basalts.

Grenville also invented the argon-38/argon-37 method of cosmic ray dating, which provided ages of young impact craters, making the photogeological age scale of lunar surface evolution quantitative.

Noble gases are natural places to study nuclear effects in nature.

Their low natural abundances mean that their isotope ratios are easily changed by even low yield nuclear reactions.

Ages of lunar craters, and other features, are most accurately determined by the Kr-Kr exposure age method.

Sub-surface lunar material is initially shielded from cosmic ray spallation reactions but, once it is brought to the surface by an impact, production of stable krypton isotopes and radioactive krypton-81 begins.

Likewise, our discovery of fission products of plutonium-244, and radiogenic iodine-129 through the measurement of xenon isotopic spectra in lunar material greatly restricts viable models for the origin of the moon.

Tags: , ,