what is the specific activity (in Ci/g) of an isotope if 3.56 mg emits 4.26 x 10^8 beta particles per second?
Answer
3.23 Ci/g
Explanation
Activity in Becquerel = 4.26×108 Bq
1Ci = 3.7 ×1010 Bq
(One Curie approximately the activity of one gram of radium per second)
Therefore,
4.26 × 108 Bq × ( 1Curie/3.7 ×1010Bq ) = 1.1514 × 10-2 Ci
Specific activity of the isotope = 1.1514×10-2Ci/0.00356g = 3.23 Ci/g
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