1878 11 290 The age-determinations thus deduced from the marine fossils and the plant-remains..lead to results of considerable divergence.
1926 R. W. Lawson tr. G. von Hevesy & F. A. Paneth xxvi. 216 Age determination from the Helium content.
2010 C. M. Aelion in C. M. Aelion et al. xi. 353 Boltwood used the idea that lead was the end product of the decay of uranium to make age determinations on uranite using U/Pb ratios.