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A sample of material contains 40 ug of 1-131. I-131 has a half-life of 8.0207 days. What is the number of I-131 atoms present

A sample of material contains 40 ug of 1-131. I-131 has a half-life of 8.0207 days. What is the number of I-131 atoms present 4 days from now?

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