Evaluation of the Signal to Noise in Different Radiographic Methods and in Standard Digitizer

P.Chitra ,B.Sheela Rani,B.Venkatraman,Baldev Raj 1,2 Sathyabama university,chennai 119 3,4 Indira Gandhi Centre for Atomic Research, Kalpakkam. [email protected] Abstract: Radiography is one of the methods to find volumetric defects in Non Destructive Technique (NDT). Radiographic film is digitized for the further assessment of the defects. The successful use of radiography depends on the source used being X-ray or Gamma rays and the digitizer. The effect of source and digitizer used should produce necessary contrast and quality of the image. This paper deals with the different radiographic technique applied on a stainless steel pipes .The resultant radiographic film is digitized in three different digitizers. The variations of image quality parameters such as Signal to Noise Ratio (SNR), Memory capacity, Resolution is analyzed for the film digitized in different resolutions and file formats. The results have been analyzed to find the suitable parameters for the digitization of radiographic weld metal. The results show that X_ray source is giving good Signal to Noise Ratio compared with the other two sources.