A sample of 9038Sr originally had an activity of 0.500mCi(millicurie). What is the activity of the sample after 30.0 years? T30 of 9038Sr is 19.9 years?
6.51×106 dps
8.51×106 dps
7.51×106 dps
None of these
A
6.51×106 dps
B
8.51×106 dps
C
None of these
D
7.51×106 dps
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