131I is a Beta - emitter used as a tracer for radioimmunoassay in biological systems. (a) Write the equation for the beta emission of 131I (b) The half life of 131I is 8.040 days. Determine: (i) The decay constant in s-1.  (ii) The activity of a 2.05 mg sample of 131I.  (iii) The percentage of 131I remaining after 16 days.  (iv) The rate of betaemission after 16 days

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