28 Geochronology Facilities
 

This database contains 28 Research Reactors performing Geochronology distributed over 24 Member States.
Note that this view includes Reactors of the following status:
OPERATIONAL, TEMPORARY SHUTDOWN

Two different methods of geochronology allow geologists to date small quantities of minerals:

  • The 1st one uses the radioactive decay of the natural Potassium 40, obtained from the ratio K40/K39. The reactor neutrons are utilised to transform Potassium into Argon, and then the ratio Ar40/Ar39 is measured
  • The 2nd one is convenient to date minerals that contain Uranium. The ratio U235/U238 is representative of the age and it is obtained by irradiating the mineral and counting fissions of U235, compared to the number of spontaneus fissions of U238.
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Note: Developing Countries as per definition of the IAEA's central database
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