You are provided with sheets of lead and apparatus to support them safely between
the source and the detector.
The thickness of lead affects the count rate. Describe the measurements you would
make to investigate this.
Your description should include:
• a variable you will control to make it a fair investigation
• how you will make your results as accurate as possible
• one safety precaution
Keep distance between the source and detector constant
Any four from:
• Record count (rate) for different thicknesses
• Record count for a specified time
• Subtract background count
• Take several readings at each thickness
• Measure thickness with micrometer screw gauge/vernier
callipers
Keep people away from source/use tongs to handle source
/use tongs to handle lead sheets/ensure source held
securely
