Radiation Decay Equation

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  • To calculate activity remaining you must know original activity.
  • This can be obtained from
    • the packing list material came with
    • label on "pig" containing material
    • UW Form 160, Radioactive Material Delivery and Usage Record

    A = A0e-0.693t/T1/2


  • A = current activity
  • A0 = Original Activity
  • t = time
  • T1/2 = Half Life


Page 68

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