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When we use tools like uranium dating and carbon dating to identify the ages of objects, how are we sure of the starting concentration of those materials such that we can date the objects by measuring the concentration of those materials remaining in the objects?

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When we use tools like uranium dating and carbon dating to identify the ages of objects, how are we sure of the starting concentration of those materials such that we can date the objects by measuring the concentration of those materials remaining in the objects?	4691