Your Name______________ Section__________

Date __________________ TA Name ________

Purpose:

• Concise description of what is to be done

Procedure:

• Brief description of procedure used (details of spl., size, irradiation, counting, etc.)

Data and Calculations:

• Table of collected data: (Your group and 1 other)

• Plots: (Plot both data sets by computer, with title and axis unit labels)-total of 4 plots
  • counts/minute vs time (minutes)

  • ln(counts/minute) vs time (minutes)

• Calculations: (may be handwritten)
  • Ao = Initial activity (from ln(counts/minute) vs time plot)-from both data sets

  • k = Rate constant-from both data sets*

  • t1/2 = Half life (minutes)-from both data sets*

*Determine t1/2 graphically (from counts/min vs time plot), then calculate k from k = (ln2)/(t1/2).
Also determine k mathematically (from computer linear fit parameters of ln(counts/min) vs time plots), then calculate t1/2 from (t1/2) = (ln2)/k
Compare values from each method. Show work and tabulate results.