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A human body excretes ( removes by waste discharge sweating etc.) certain materials by a law similar to radioactivity. if technitium is injected in some form in a human body.the body exerts half - the amount in 24hours . A patient is given an injection containing $$ ^{99}tc $$ this isotope is radioactive with a half-life of 6 hours.the activity frim the body just after the injection is $$ 6 \mu Ci $$ How much time will elapse before the activity falls to $$ 3 \mu Ci $$?

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131I is an isotope of Iodine that β decays to an isotope of Xenon with a half-life of 8 days. A small amount of a serum labelled with 131I is injected into the blood of a person. The activity of the amount of 131I injected was 2.4×105 Becquerel (Bq). It is known that the injected serum will get distributed uniformly in the blood stream in less than half an hour. After 11.5 hours, 2.5 ml of blood is drawn from the person's body, and gives an activity of 115 Bq. The total volume of blood in the person's body, in liters is approximately _______.


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A human body excretes (removes by waste discharge, sweating etc) certain materials by a law similar to radioactivity. If technetium is injected in some form in a human body, the body excretes half the amount in 24 hours. A patient is given an injection containing 99Tc. This isotope is radioactive with a half-life of 6 hours. The activity from the body just after the injection is 6 μ Ci. How much time will elapse before the activity falls to 3 μ Ci ?

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