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Homework Help: Half Life of Rb 87

  1. Sep 24, 2016 #1
    1. The problem statement, all variables and given/known data
    Specific Activity of a sample of rubidium chloride is 478 Bq per gram
    knowing that activity is coming from Rb-87, calculate the half life of radioisotope

    - Molar mass of the RbCl natural is 120.9256 gram
    - Isotope composition of natural Rb is 72.15% and 27.85% respectively for Rb -85 and Rb-87.

    2. Relevant equations
    Calculate Half life of radioisotope from mixture.

    3. The attempt at a solution
    First find the number of Rb-87 atoms in solution.
    Find the decay constant
    so we can get half life.
    is this process is correct?
  2. jcsd
  3. Sep 24, 2016 #2
    how one will calculate the decay constant...pl.show some work done ...as its a homework exercise.
    One becquerel is defined as the activity of a quantity of radioactive material in which one nucleus decays per second. The becquerel is therefore equivalent to an inverse second, sāˆ’1.
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