Dunkl, István; Dani˘sík, Martin; Picotti, Vincenzo; Frisch, Wolfgang; Eynatten, Hilmar von; Castellarin, Alberto (11. Symposium "Tektonik, Struktur- und Kristallingeologie", 2006-03)
The radiogeic 4He isotope is continuously
forming in the lithosphere mainly
by the alpha-decay of U, Th and Sm.
This decay process was discovered already
at the beginning of the 20th century,
and the first U/He dating ...