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Imaging in Radiographic Inspection

G.G.PURANIK
H.E.M.R.L. PUNE 411 021 (INDIA)
N.J.TOWNSEND
X- INNOVATIONS LTD. BRISTOL ( U.K.)
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INTRODUCTION :

IMAGING TECHNIQUES :


IMAGING TECHNIQUE
FEATURES FILM BASED I.I. TUBE BASED CCD BASED
1. ENERGY RANGE Suitable 'film / screen' combination covers entire range. Suitable for low and medium energy ranges. Phosphor screens - easily interchangeable - optimised for required energy ranges.
2. IMAGE QUALITY (CONTRAST/RESOLUTION) - GOOD - INFERIOR ( IMAGE IS NOISY) COMPARABLE TO FILM.
3. SCREEN SIZE NORMALLY 35 X 43 cm (max) OR ROLL FILM 300 MM CIRCULAR ( PIN CUSHION DEFECT FOR HIGHER DIAMETER TUBES) ANY SIZE, NO PRACTICAL LIMIT.
4. IMAGING TIME (TYPICAL) 20 MIN. (FILM LOADING, EXPOSURE, PROCESSING) INSTANTANEOUS. FEW SECONDS.
5. IMAGE PROCESSING. NOT POSSIBLE LIMITED FUNCTIONS. LARGE NO OF FUNCTIONS ARE POSSIBLE.
6. APPLICATION / MOBILITY SUITABLE FOR FIELD APPLICATION FULLY MOBILE. NOT FOR FIELD APPLICATION NOT MOBILE. NOT FOR FIELD APPLICATION ( BEING DEVELOPED) LIMITED MOBILITY
7. COST/ EXPENSES/ LIFE. CHEAPEST (RECURRING FILM COSTS HIGH) COSTLY, BUT NO RECURRING FILM EXPENSES. LIMITED TUBE LIFE. COSTLIER, NO FILMS, VERY LONG LIFE.
TABLE-1: (3) BRIEF COMPARISON(Qualitative, not exhaustive)

DISCUSSION:

FUTURE SCENARIO:

ACKNOWLEDGEMENTS :

REFERENCES :

  1. Industrial Radiography - R. Halmshaw, Appl. Sci.Publishers (U.K.)
  2. Industrial Radiography - AGFA GEVAERT NV.
  3. Indo- German workshop on D.I.R., Vadodara Dec' 99

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