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 )

(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 amount of ""_(92)U^(238) required to produce a-particles of 20 millicurie strength. The half-life of ""_(92)U^(238) is 4.5 xx 10^(9) years.

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

What is the amount of "^(60)CO_(27) necessary to provide a radioactive source of 8.0 m Ci strength? The half-life of ^(60)CO_(27) is 5.3 years.

Obtain the amount of ( )_(27)^(60) (Co) (in mu (g) ) necessary to provide a radioactive source of 8.0 (~m) (Ci) strength. The half life of ( )_(27)^(60) (Co) is 5.3 years. (Give answer in integer value)

The half-life of ""_(54)Po^(210) is 140 days. What amount of ""_(54)Po^(210) is required to provide source of a-particles of 10 mCi strength?

Find the activity of 1 g sample of ""_(84)Po^(210) . The half-life of ""_(84)Po^(210) is 138 days.