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The specific activity of a preparation c...

The specific activity of a preparation consisting of radioactive `Co^(58)` and non-radioactive `Co^(59)` is equal to `2.2xx10^(12)` disintegration per sec gram. The half-life of `Co^(58)` is `71.3` days. The ratio of the mass of radioactive cobalt in that preparation to the total mass of the preparation in percentage is

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