Radioactive iodine is used to investigate tumours of the thyroid gland. Iodine-131 has a half life of 8 days. It is used

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Radioactive iodine is used to investigate tumours of the thyroidgland. Iodine-131 has a half life of 8 days. It is used as a tracerin the human body to investigate if the thyroid gland is workingproperly. After it is administered to a patient, it is monitored bya doctor for several days. Another isotope iodine-128 has ahalf-life of 25 minutes.a. Explain why iodine-128 is unsuitable to be used here.b. Calculate the decay constant in s−1 and the activity of 1mgsample of iodine-131.