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Thorium-229 is a highly radioactive isotope used in the treatment of certain cancers. Use the chart to determine how much thorium would remain after 7,340 years if a sample began at 20 pounds of pure Th-229.
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Thorium-229 is a highly radioactive isotope used in the treatment of certain cancers. Use the chart to determine how much thorium would remain after 7,340 years if a sample began at 20 pounds of pure Th-229.

User Callan
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10 pounds if u using usateprep

User Palmer Dabbelt
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The half-life for Th-229 is 7,340 years. This means that with 20 pounds, in 7,340 years, half would be left, or 10 pounds.

User Sungiant
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