Problem 6.226

The specific activity of a preparation consisting of radioactive \(\mathrm{Co}^{58}\) and nonradioactive \(\mathrm{Co}^{59}\) is equal to \(2.2 \cdot 10^{12} \mathrm{dis} /(\mathrm{s} \cdot \mathrm{g})\). The half-life of \(\mathrm{Co}^{58}\) is 71.3 days. Find the ratio of the mass of radioactive cobalt in that preparation to the total mass of the preparation (in per cent).