 In the “Radiographic Guidance Notes 2001” there are minimum and interim targets for each grade.For a Grade 1 the target is to be no less than 50% of radiographs taken annually but is realistically not less than 70%, Grade 2 target is to be no less than 40% but is ideally not greater than 20% whereas grade 3 target should be no greater than 10% which is realistically upheld.To maintain a high standard of Grade 1 and 2 images each film needs to be examined to put the image into a specific category.