“…The ejection effect can be significant and its quantification is of primary importance not only for noble gas thermochronology for various mineral phases (Farley et al, 1996;Tagami et al, 2003;Gautheron et al, 2006), but also nuclear waste, U-Th disequilibrium, etc. (Adloff and Rö ssler, 1991;Bourdon et al, 2003). In the case of (U-Th-Sm)/He thermochronology, the fraction of 4 He retained after loss due to this mechanism is termed F T , and, to first order, the (U-Th-Sm)/He age can be corrected by dividing it by F T (Farley et al, 1996).…”