Constants and Conversion Factors 1 Ci = 3.7 x 10¹⁰Bq Number of atoms per mole = Avogadro's number, Aw = 6.023 x 10²3 mol

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Constants And Conversion Factors 1 Ci 3 7 X 10 Bq Number Of Atoms Per Mole Avogadro S Number Aw 6 023 X 10 3 Mol 1 (55.23 KiB) Viewed 9 times

Constants and Conversion Factors 1 Ci = 3.7 x 10¹⁰Bq Number of atoms per mole = Avogadro's number, Aw = 6.023 x 10²3 mol-¹ Number of grams of Cs per mol. = 137g mol™¹ 1) If a sample has 2 x 105 decays in 3 seconds, what is the activity in Ci? Ci Submit 2) How many atoms of 131 I are in a sample with activity of 0.5 mCi given that the half-life of 131 I is 8.023 days? atoms Submit 3) 137 Cs, is a radioisotope that is often used for the calibration of radiation detectors, such as those used in PET scanners. If you have 2 x 1012 atoms of 137 Cs, what will the activity be after 50 years assuming that the half-life of 137 Cs is 30.07 years? Bq Submit + 4) In a real world situation, we would measure the quantity of a substance in grams rather than atoms. What if, instead of 2 x 1012 atoms, you started with 0.5 gram of 137 Cs? Bq Submit Help