Detection by Film
     Radiography is the production of an image on photographic film created from a radiation 
     source. The principle is the same as taking a photograph with a camera, but radiation is 
     substituted for light. An image is produced by ionizing radiation on the undeveloped film. 
     When the film is processed, it can show the location and intensity of the source used and 
     the shape of objects placed between the source and film. 

     Objective 
     To investigate the effect of radiation (beta particles) on photographic film. 

    Materials
          Dental X-ray film 
          Sr-90 (beta source) 
          Tape 
          A key


       Go to Becquerel's Experiment

    
    Procedure
    1. Place the key on the dental X-ray film.
    2. Secure with tape
    3. Place the beta source over the key.
    4. Allow time (overnight) for the film to absorb the radiation. 
    5. Remove the key from the film. 

    Analysis
     From the blackening of the film, we can conclude that the source continously 
     emitted radiation to blacken the film.

    Do you know?
     1. Would gamma radiation produce an image of the paper clip? Explain.


     
  

    
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