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- Q4789695 subject Q8621270.
- Q4789695 abstract "Argon–argon (or 40Ar/39Ar) dating is a radiometric dating method invented to supersede potassium-argon (K/Ar) dating in accuracy. The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes. 40Ar/39Ar dating relies on neutron irradiation from a nuclear reactor to convert a stable form of potassium (39K) into the radioactive 39Ar. As long as a standard of known age is co-irradiated with unknown samples, it is possible to use a single measurement of argon isotopes to calculate the 40K/40Ar* ratio, and thus to calculate the age of the unknown sample. 40Ar* refers to the radiogenic 40Ar, i.e. the 40Ar produced from radioactive decay of 40K. 40Ar* does not include atmospheric argon adsorbed to the surface or inherited through diffusion and its calculated value is derived from measuring the 36Ar (which is assumed to be of atmospheric origin) and assuming that 40Ar is found in a constant ratio to 36Ar in atmospheric gases.".
- Q4789695 wikiPageExternalLink argon.anu.edu.au.
- Q4789695 wikiPageExternalLink argon_lab.html.
- Q4789695 wikiPageExternalLink geochronology.geoscience.wisc.edu.
- Q4789695 wikiPageExternalLink pompeii.html.
- Q4789695 wikiPageExternalLink NMGRL_homepage.html.
- Q4789695 wikiPageExternalLink argonisotopefacility.
- Q4789695 wikiPageExternalLink argon-noble-gas-research.
- Q4789695 wikiPageWikiLink Q1057300.
- Q4789695 wikiPageWikiLink Q105794.
- Q4789695 wikiPageWikiLink Q106532.
- Q4789695 wikiPageWikiLink Q1068405.
- Q4789695 wikiPageWikiLink Q141118.
- Q4789695 wikiPageWikiLink Q1418023.
- Q4789695 wikiPageWikiLink Q168756.
- Q4789695 wikiPageWikiLink Q180809.
- Q4789695 wikiPageWikiLink Q214753.
- Q4789695 wikiPageWikiLink Q41177.
- Q4789695 wikiPageWikiLink Q47089.
- Q4789695 wikiPageWikiLink Q4892021.
- Q4789695 wikiPageWikiLink Q5135533.
- Q4789695 wikiPageWikiLink Q55811.
- Q4789695 wikiPageWikiLink Q5607539.
- Q4789695 wikiPageWikiLink Q574576.
- Q4789695 wikiPageWikiLink Q58808.
- Q4789695 wikiPageWikiLink Q696.
- Q4789695 wikiPageWikiLink Q703.
- Q4789695 wikiPageWikiLink Q7100099.
- Q4789695 wikiPageWikiLink Q8621270.
- Q4789695 comment "Argon–argon (or 40Ar/39Ar) dating is a radiometric dating method invented to supersede potassium-argon (K/Ar) dating in accuracy. The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes. 40Ar/39Ar dating relies on neutron irradiation from a nuclear reactor to convert a stable form of potassium (39K) into the radioactive 39Ar.".
- Q4789695 label "Argon–argon dating".