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The long-term behavior of Th0.87Pu0.13O2 was examined in nitric acid concentrations. The normalized dissolution rates after 3380 days, range from (1.4 ± 0.2) × 10−6 g m−2 d−1 in 5 M HNO3 down to (3.2 ± 0.4) × 10−8 g m−2 d−1 in 10−3 M HNO3, which confirms the high chemical durability of this solid solution. The amounts of plutonium measured in solution lead to 0.9% and 2.1% of dissolved solid in 1 M...
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