Determine the amount of `._84Po^(210)` necessary to provide a source of `alpha` particles of 5 millicurie strength. The half life of Po is 138 days.

Determine the amount of ""_(84)Po^(210) (polonium ) necessary to provide a source of alpha -particles of 5 millicurice strength , if life of polonium is 138 days (given ,1 curie =3.7xx10^(10) disintegrations /s )

Determine the amount of ""_(84)Po^(210) (polonium ) necessary to provide a source of alpha -particles of 5 millicurice strength , if life of polonium is 138 days (given ,1 curie =3.7xx10^(10) disintegrations /s )

(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).

Obtain the amount of ._(27)^(60)Co necessary to provide a radioactive source of 8.0 mCi strength. The half-life of ._(27)^(60)Co is 5.3 years.

Obtain the amount of "_27^60Co necessary to provide a radioactive source of 8.0 mCi strength. The half-life of "_27^60Co is 5.3 years.

Obtain the amount of ""_(27)^(60)Co necessary to provide a radioactive source of 8.0 mCi strength. The half-life of ""_(27)^(60)Co is 5.3 years.