Radiogenic Lead with Dominant Content of ²⁰⁸Pb: New Coolant and Neutron Moderator for Innovative Nuclear Facilities

Table 8

Main deposits of uranium, thorium, and mixed uranium-thorium ores. Elemental compositions of minerals and isotope compositions of radiogenic lead.

Deposit	U/Th/Pb; (wt.%)	^204Pb/^206Pb/^207Pb/^208Pb; (at.%)	Age,; 10^9 years
Monazite (Guarapari, Brazil)	1.3/59.3/1.5	0.005/6.03/0.46/93.5	0.52–0.55
Monazite (Manitoba, Canada)	0.3/15.6/1.5	0.010/10.2/1.86/87.9	1.83–3.18
Monazite (Mt. Isa Mine, Australia)	0.0/5.73/0.3	0.038/5.44/0.97/93.6	1.00–1.19
Monazite (Las Vegas, USA)	0.1/9.39/0.4	0.025/9.07/1.13/89.8	0.77–1.73
Uraninite (Singar Mine, India)	64.3/8.1/8.9	—/89.4/6.44/4.18	0.885
Monazite (South Bug, Ukraine)	0.2/8.72/0.9	0.010/6.04/0.94/93.0	1.8–2.0