PIRA: 7D10.20


 Lab Equipment  Directions
  1.  Thornton counter
  2. Geiger tube with stand
  3. Barium ‘cow’ (minigenerator)
  4. half-life eluant solution
  5. planchet
  6. stopwatch
  1.  Set up as shown connecting the Geiger tube to 450V and input terminals.
  2. Squeeze 2-3 drops of eluant through Barium cow (may need to discard first 2 drops) onto a planchet.
  3. Place planchet under the Geiger tube.
  4. Use the stopwatch to time the number of counts for equal time intervals.