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Constants and Conversion Factors 1 Bq - 1 decay/s 1 Ci 3.7 x 101°Bq Avogadros number Number of atoms per mole 6.023 x 1023 4) If you have 2 x 1012 atoms of 131Cs, what will the activity be after 50 years? Half life of 137Cs is about 30 years. 6.205E-9 Bq Submit Help Your submissions: 6.205E-9 x Computed value: 6.205E-9Submitted: Sunday, July 8 at 6:49 PM Feedback: 5) How much activity will there be in 137Cs after 50 years if you instead started with a 1g sample? Bq Submit

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