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Homework Help: When does backgroud radiation more signifigant?

  1. Apr 28, 2005 #1
    We did an experiment. We used a geiger counter to measure wafers of alpha, beta, and gamma radiation. We measured by distance away and by using thinks to block the radiation like aluminum, paper, lead. Distances were 1cm, 10 cm, 20cm, 40cm. Would the distance be the answer because there would be more background radiation the further away you get? please help me
     
    Last edited: Apr 28, 2005
  2. jcsd
  3. Apr 28, 2005 #2
    There is no more background radiation the further you move the counter from the source. It is generally constant. However to get good readings from your source at a greater distance, you were probably reading the counts over a longer time. Therefore the background radiation becomes significant as their rate become comparitable with the rate you're measuring.
     
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