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A device used in radiation therapy for cancer contains 4.70×10-1 g of cobalt 2760Co (59.9333819 u)....

A device used in radiation therapy for cancer contains 4.70×10-1 g of cobalt 2760Co (59.9333819 u). The half-life of 2760Co is 5.57 yr. Determine the activity of the radioactive material.

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Answer #1

I u = 1066x10-27 kg No.of co atoms = (N) 4.70 xlo g *10%(kg/g) 59.9333819 % (1.66810 27 kg). = 4.724 x 1021 A = 2 N en 2 x N

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