ISO 5579 radiographic examination of metallic materials.pptx

RADIOGRAPHY STANDARD

1. ISO 5579 NDT – radiographic examination of metallic materials

2. Nominal thickness, t Penetrated thickness, w Object to film distance, b Source size, d Source to Film Distance, SFD Source to object distance, f Definitions

3. Class A: Basic techniques Class B: Improved techniques Class B is more sensitive than class A The choice of these 2 class is based on agreement between parties Classification of radiography techniques

4. Protection against radiation: apply national or international precautions Arrangement: beam shall be in middle, normal Identification of radiograph: symbols shall be affixed each section and shall appear outside the interest area Marking: permanent marking on the object Overlap of films Image quality Indicator (IQI): according with ISO 1027 and ISO 2504

5. Choice of x-ray tube voltage or gamma source For gamma radiography, Travel time shall not exceed 10% of the total exposure time Film systems and screens Aligned of beam Reduction of scattered radiation Using mask, the beam is limited to the interest area. (placing lead letter B behind the film) Recommended Techniques

6. Source to object distance Maximum area for single exposure For class A:1.2 for class B: 1.1 Density of radiographs Minimum density for class A:2.0 & B:2.3 Processing Film viewing conditions Darkroom ISO 2504 luminance ISO 5580 Recommended Techniques- continued

7. Choice of X-ray tube voltage

8. Reduction of scattered radiation

9. Source to object distance

10. Test report

11. Test report - continued