International Journal of Nuclear Energy / 2014 / Article / Tab 5

Research Article

Improving Nuclear Safety of Fast Reactors by Slowing Down Fission Chain Reaction

Table 5

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

DepositU/Th/Pb (wt.%) 204Pb/206Pb/207Pb/208Pb (at.%)Age (×109 yr)

Monazite, Guarapari, Brazil1.3/59.3/1.50.005/6.03/0.46/93.50.52 to 0.55
Monazite, Manitoba, Canada0.3/15.6/1.50.01/10.2/1.86/87.91.83 to 3.18
Monazite, Mt. Isa Mine, Australia0.0/5.73/0.30.038/5.44/0.97/93.61.00 to 1.19
Monazite, Las Vegas, Nevada0.1/9.39/0.40.025/9.07/1.13/89.80.77 to 1.73
Uraninite, Singar Mine, India64.3/8.1/8.9—/89.4/6.44/4.180.885
Monazite, South Bug, Ukraine0.2/8.72/0.90.01/6.04/0.94/93.01.8 to 2.0

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