Table 2. U-Pu/Xe ages.

Age uncertainties include uncertainties on [Nd], [U], [¹³⁶Xe], Solar System initial Pu/U and Pu/Nd ratios, ¹³⁶Xe cumulative yields, branching ratios, and ²³⁸U and ²⁴⁴Pu decay constants.

Aliquot	No Pu	Pu/U* assumed	Pu/Nd† assumed
	Age ± 2σ (Ma)	Age ± 2σ (Ma)	Age ± 2σ (Ma)
LLNL-UI-1	9111 ± 813	4274 ± 44	4319 ± 46
LLNL-UI-2	4541 ± 636	3963 ± 126	3990 ± 167
LLNL-UI-3	11944 ± 1002	4358 ± 47	4301 ± 48

*On the basis of a Solar System initial Pu/U = 0.0068 ± 0.0010 [Hudson et al. (21)].

†On the basis of a Solar System initial Pu/Nd = 0.00015 [Lugmair and Marti (22)]. No uncertainty is given in Lugmair and Marti (22). A 15% uncertainty is assumed here.