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5. Cobalt - 60 decays with a half - life of 5.27 years to produce Nickel...

5. Cobalt - 60 decays with a half - life of 5.27 years to produce Nickel - 60. How long does it take for a sample of Cobalt - 60 to disintegrate to the extent that only 2.0% of the original amount remains?

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