Herstellung von >99,9997% 38Argon für die 40K-40Ar-Geochronologie
Earle E. Schumacher · CHIMIA International Journal for Chemistry · 1975
For the conventional 40K-40Ar-dating method a very pure 38Ar-spike is used as an internal standard for the mass spectrometric determination of the radiogenic 40Ar content of the sample. By means of a 54 m long thermal diffusion column and a carrier gas of 37Cl enriched HCl 38Ar has been produced with 99,99 % Argon. Spike corrections will no longer be necessary with this preparation and younger rocks can be dated which is essential for geologic problems of the Alps and contemporary mountain systems.