60Co is produced by neutron activation of 59Co placed in a nuclear reactor where the neutron flux is 1.0 × 1018 neutrons/m2 . s. The cross section is 20 b, and the sample of 59Co has mass 40 mg. (a) If the 59Co is left in the reactor for one week, how many 60Co nuclei are produced? (b) What would be the activity of the 60Co? (density of cobalt = 8.9 g/cm3) (c) Describe a procedure for producing 1.0 × 1014 Bq of 60Co for medical use.
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