Calculate the activity of one gm sample of `._(38)^(90)Sr` whose half life period is 28.8 years.

(a) Calculate the activity of one mg sample ._(28^(Sr^(90))) whose half life period is 28 years. (b) An experiment is performed to determine the half-life of a radioactive substance which emits one beta particle for each decay process. Observation shown that an average of 8.4 beta- particles are emitted each second by 2.5 mg of the substance. the atomic weight of the substance is 230 . calculate the half0life of the substance. (c) Determine the quantity of ._(84^(Po^(210))) necessary to provide a source of alpha particle of 5mCi strength ( T_(1//2) for Po = 138 day).

(a) Calculate the activity of one mg sample ._(28^(Sr^(90))) whose half life period is 28 years. (b) An experiment is performed to determine the half-life of a radioactive substance which emits one beta particle for each decay process. Observation shown that an average of 8.4 beta- particles are emitted each second by 2.5 mg of the substance. the atomic weight of the substance is 230 . calculate the half0life of the substance. (c) Determine the quantity of ._(84^(Po^(210))) necessary to provide a source of alpha particle of 5mCi strength ( T_(1//2) for Po = 138 day).

Find the activity of 1 gm of radium (._(88)Ra^(226)) Whose half life is 1620 years.

Calculate the activity of 1 mg of a radioactive sample whose mass no. is 90 and half life is 28 years.

Calculate the average life of a radioactive substance whose half life period is 1650 years.

Calculate the average life of a radioactive substance whose half-life period is 100 years.

Calculate the average life of a radioactive substance whose half-life period is 100 years.

What is the mass of ""^(14)C isotope that will have an activity of one curie if half-life period of ""^(14)C is 5730 years ?

The radium and uranium atoms in a sample of uranium mineral are in the ratio of 12.8xx10^(6) . If half life period of radium is 1620 years , the half life period of uranium will be