If the amount of radioactive iodine-123 in a sample decreases from 0.4 mg to 0.1 mg in
Chapter 0, Problem 5.64(choose chapter or problem)
If the amount of radioactive iodine-123 in a sample decreases from 0.4 mg to 0.1 mg in 26.4 h, what is the half-life of iodine-123? (5.4)
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