questions

• Describe how a teacher should use a Geiger-Müller (GM) tube to compare the count-rates from two different radioactive rocks.

  1. put rock(s) in front of/near tube (1)
  2. measure (count rate) separately for the two different rocks (1)
  3. measure each count for the same time period (1)
  4. keep source-detector distance the same for both rocks (1)
  5. take (into account)/ measure background count (1)
  6. repeat readings and take average(s) (1)