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)

One microgram of radioactie sodium Na^(24) with a half life of 15 h was injected fin to a living system for a bio assay .How long will iot take for the radioactivity to fall to 25% of the initial value?

A radioactive isotope has a life of T years. How long will it take the activity to reduce to (a) 1% of its original activity?

A radioactive isotope has a life of T years. How long will it take the activity to reduce to (a) 3.125% (b) 1% of its original activity?

A radioactive isotope has h half-life of 2 yr. how long will itt take the activity to reduce to 3% of its original value

The half-life of iodine-131 is 8.02 days. How long will it take for 80% of the sample to decay?

The first-order disappearance of a substance has a half-life of 34.0 s. How long does it take for the concentration of that substance to fall to 12.5% of its initial value?

One microgram of phosphorus-32 was injected into a live syetm for biological studies. The half life ""_(15)P""^(32) is 14.3 days, calculate the time it will take the radioactivity to fall to 10% of the initial value

If half life period for a first order reaction in A is 2 minutes, how long will it take [A] to reach (i) 25% of its initial concentration ii) 10% of its initial concentration?

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)