A human body excreates (removes by waste discharge, sweating, etc,) certain materials by a law similar to radioactivity.If technitium is injected in some form 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 mu Ci`. How much time will elapse before the activity falls to `3 mu Ci`?

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

The half-life of Tc^(99) is 6 h. The activity of Tc^(99) in a patient , 60 h after receiving an injection conataining this radiosotope is at least 0.125 mu Ci. What was the minimum activity (in mu ci) of the sample injected?

(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.

A human body required 0.01M activity of a radioactive substance after 24 hours. Half life of the radioactive substance is 6 hours. The injection of maximum activity of the radioactive substance that can be injected is :

A human body required the 0.01 M activity of radioactive substance after 24 h. Half life of radioactive substance is 6h. Then injection of maximum activity of radioactie substance that can be injected will be

A human body required the 0.01 M activity of radioactive substance after 24 h. Half life of radioactive substance is 6h. Then injection of maximum activity of radioactie substance that can be injected will be