5. Two materials of the same thickness have different densities: 5 g/cm and 11g/cm. Which density will produce the lightest image on the x-ray film and why? (2 marks) 6. What device is used in order to ensure the image quality of a radiograph is of high quality? How is the proper size of this device selected when producing a radiograph? (2 marks) 7. List three advantages when using radiography as a non-destructive testing method. (3 marks) 8. List three limitations when using radiography as a non-destructive test method. (3 marks) 9. What are the three basic ways to lower your dose rate if you are working around a radiation source? (3 marks) 10. What material is used in radiographic film to produce the image? (1 mark)