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The standard source for radiation therapy was radioactive 60Co which decays with a halflife of 5.27y, into an excited nuclear state of 60Ni.

Please help me with this problem. The standard source for radiation therapy was radioactive 60Co which decays with a halflife of 5.27y, into an excited nuclear state of 60Ni. That nickel isotope then immediately emits two gamma ray photos wach with energy of 1.2 MeV. How many radioactive 60Co nuckei are present in a 6000 Ci source?

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