In situ cosmogenic 10Be and 21Ne in sanidine and in situ cosmogenic 3He in Fe-Ti-oxide minerals

Fe-Ti-oxide minerals retain 3He quantitatively. Experimentally derived production rates are in excellent agreement with new values derived from physical modelling. The mean experimental 3He production rate for five Fe-Ti-oxide minerals samples is 120 ± 11 atoms g− 1 yr− 1 (120 ± 12 atoms g− 1 yr− 1 including the uncertainties of P21Neqtz), compared to a mean modelled value of 124 atoms g− 1 yr− 1, which has an estimated uncertainty of 20%. The variable chemical and structural composition of the solid solution lines of Fe-Ti-oxide minerals has little effect on the total 3He production rate. Cosmogenic 21Ne is not produced in significant quantities in Fe-Ti-oxide minerals due to the absence of suitable target elements.