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The figure below shows features of a diffusion cloud chamber used for detecting radiations from a radioactive source.
Physcf4et1p2q15b

  1. Explain how the chamber works when a radioactive particle is introduced at the source.
  2. What is the purpose of solid carbon (IV) oxide. 
  3. State one advantage of the cloud chamber over a G.M tube as a detector of radioactive radiations.

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  1. Explain how the chamber works when a radioactive particle is introduced at the source. 
    • The radiations ionize argon gas along their path. The alcohol vapour condense on the ions formed creating tracks.
  2. What is the purpose of solid carbon (IV) oxide. 
    • Lower the temperature in the chamber thus making it possible for the alcohol vapour to condense.
  3. State one advantage of the cloud chamber over a G.M tube as a detector of radioactive radiations. 
    • The nature of the radiation can be identified
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