The decay chain 139 Cs → 138 Ba→ 139 La is observed from an initially pure sample 55 56 57 of 1 mCi of 139 Cs. The half-lives are 138 Cs: 9.5 min.; 138 Ba: 82.9 min; 1939 La: 55 stable. What is the maximum 139 Ba activity and when does it occur? 56 The nucleus of 90 Sr (T1/2 = 28.8 years) undergoes ẞ decay to produce 90Y (T1/2 = 2.67 days). If a pure sample of 90 Sr of with an initial activity of 2 MBq had been isolated 14.4 years ago, approximately what mass of 90Y would be present today?
The decay chain 139 Cs → 138 Ba→ 139 La is observed from an initially pure sample 55 56 57 of 1 mCi of 139 Cs. The half-lives are 138 Cs: 9.5 min.; 138 Ba: 82.9 min; 1939 La: 55 stable. What is the maximum 139 Ba activity and when does it occur? 56 The nucleus of 90 Sr (T1/2 = 28.8 years) undergoes ẞ decay to produce 90Y (T1/2 = 2.67 days). If a pure sample of 90 Sr of with an initial activity of 2 MBq had been isolated 14.4 years ago, approximately what mass of 90Y would be present today?
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Transcribed Image Text:The decay chain 139 Cs → 138 Ba→ 139 La is observed from an initially pure sample
55
56
57
of 1 mCi of 139 Cs. The half-lives are 138 Cs: 9.5 min.; 138 Ba: 82.9 min; 1939 La:
55
stable. What is the maximum 139 Ba activity and when does it occur?
56
The nucleus of 90 Sr (T1/2 = 28.8 years) undergoes ẞ decay to produce 90Y (T1/2 =
2.67 days). If a pure sample of 90 Sr of with an initial activity of 2 MBq had been
isolated 14.4 years ago, approximately what mass of 90Y would be present today?
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