Which of the following represents the half life of I123 ?: (A) 3. 2 hours, (B) 13.2 hours, (C) 8 days, (D) 10 days
Answer is B. Half life of radioisotope I 123 is 13.2 hours. Half life of I 124 is 4.2 days and that of I 131 is 8days.