Module 5 - Radiography Testing 
                       Radiography 
    •  Radiography is used in a very wide range of 
       applications including medicine, engineering, 
       forensics, security, etc.  
    • In NDT, radiography is one of the most 
       important and widely used methods.  
    • Radiographic testing (RT) offers a number of 
       advantages over other NDT methods, 
       however, one of its major disadvantages is the 
       health risk associated with the radiation.  
                         Asst. Prof. Vishnu Sankar,DME,RSET 
    • RT is one of the most widely used NDT 
      methods for the detection of internal defects 
      such as porosity and voids. 
    • With proper orientation of the X-ray beam, 
      planar defects can also be detected with 
      radiography. 
    • It is also suitable for detecting changes in 
      material composition, thickness 
      measurements and locating unwanted or 
      defective components hidden from view in an 
      assembled part. 
       
                       Asst. Prof. Vishnu Sankar,DME,RSET 
      • In general, RT is method of inspecting materials for hidden flaws 
      by using the ability of short wavelength electromagnetic 
      radiation (high energy photons) to penetrate various materials. 
      •The intensity of the radiation that penetrates and passes 
      through the material is either captured by a radiation sensitive 
      film (Film Radiography) or by a planer array of radiation sensitive 
      sensors (Real-time Radiography). 
      •Film radiography is the oldest approach, yet it is still the most 
      widely used in NDT.  
        
                               Asst. Prof. Vishnu Sankar,DME,RSET