A sample of `{:(131),( 53):}` I, as iodine ion, was administered to a patient in a carrier consisting of `0.10` mg of stable iodide ion. After `4.00` days, `67.7%` of the initial radioactivity was detected in the thyroid gland of the patient. What mass of the stable iodide ion had migrated to the thyroid gland ? (`t_(1 //2 = 8` days.)

A sample of ._(53)I^(131) , as iodide ion, was administered to a patient in a carrier consisting of 0.10 mg of stable iodide ion. After 4.00 days 67.7% of the initial radiactivity was detected in the thyroid gland of the patient. What mass of the stable iodide ion had migrated to the thyroid gland? Of what diagnostic value of is such an experiment? (t_(1//2) = 8 days)

A sample of ._(53)I^(131) , as I^(ɵ) ion, was administered to a patient in a carrier conissting 1.0 mg of stable I^(ɵ) ion. After 4.0 days, 60% of the initial radioactivity was detected in the thyroid gland of the patient. What mass of the stable I^(ɵ) ion had migrated to the thyroid gland? (Given: t_(1//2) of I^(131) = 8 days)

A sample of ._(53)I^(131) , as I^(ɵ) ion, was administered to a patient in a carrier conissting 1.0 mg of stable I^(ɵ) ion. After 4.0 days, 60% of the initial radioactivity was detected in the thyroid gland of the patient. What mass of the stable I^(ɵ) ion had migrated to the thyroid gland? (Given: t_(1//2) of I^(131) = 8 days)

One mu g of a radioactive iodine contained in thyroxine is injected into the blood of a patient. How long will it take for radioactivity to fall to 50%, 25% and 10% of the initial value? ( t_(1//2) for ._(53)^(131)I = 8.052 days)

(a) A radioactive sample has 6.0 xx 10^(18) active nuclei at a certain instant. How many of these nuclei will still be the same active state after two half-lives? (b) Radioactive phosphours -32 has a half-life of 14 days. A source containing this isotope has an initial activity of 10muCi . (i) What is the activity of the source after 42 days? (ii) What time elapse before the activity of the source falls at 2.5muCi ? (c) 1g of a radioactive substance disintergrates at the rate of 3.7 xx 10^(10) dps . The atomis mass of the substance is 226 . Calculate its mean life.