Biologically useful technetium nuclei (with atomic weight 99) have a half life of 6 hrs. A solution containing `10^(-12)` g of this is injected into the bladder of a patient. Find its activity in the beginning and after one hour.

Biologically useful technetium nuclei(with atomic weight 99) have half life of 6 hours.a solution conatning 10^(-12) gram of this is injected into the bladder of a patient .Find its activity at the beginning and after one hour.

A radioactive substance has a half-life of 10 hours. Calculate the activity of 10^(-10) gram of the substance after 2 hours if its atomic mass is 102.

A small quantity of solution containing Ne^(24) radio nucliode (half life = 15 hour ) of activity 1.0 microcurlar is injected into the blood of a person A sample of the blood of volume 1 cm^(3) taken a after 5 hour shown an activity of the blood in the body of the person . Assume that redicative solution mixed uniformly in the blood of the person (1 curie = 3.7 xx 10^(10) disntegrations per sound)

A small quantity of solution containing Na^(24) radio nuclide (half-life 15 hours) of activity 1.0 microcurie is injected into the blood of a person. A sample of the blood of volume 1 cm^(2) taken after 5 hours shows an activity of 296 disintegrations per minute. Determine the total volume of blood in the body of the person. (1 curie =3.7xx10^(10) disintegrations per second.)