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22 June, 23:21

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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  1. 23 June, 02:49
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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.
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