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The isotope 79Au198 (atomic mass 197.968 u) of gold, which has a half-life of 2.69 days,...

The isotope 79Au198 (atomic mass 197.968 u) of gold, which has a half-life of 2.69 days, is used in cancer therapy. What mass (in grams) of this isotope is required to produce an activity of 393 Ci?

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