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The half-life of radium-226 is 1600 years. How much of a 1 kg has decayed after 12,800 years? How long will it take for the sample to decay to 1/512 of the original amount? After 1 year, 80% of the initial amount of a radioactive substance remains. (A) What is the half-life of the substance? (B) How many half-lives have passed until only 3.125% of a radioactive sample is left?