Seeking expert advice: how to determine the transmission geometry parameters
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In NB/T 47013.2-2015, there is also a nomogram available for determining the penetration geometry parameter f (the minimum distance from the radiation source to the workpiece surface). However, in Part 11, which deals with X-ray digital imaging inspection, it is not clear how the penetration geometry parameter f is estimated Also, is the focal length of a certain type of radiography device fixed (non-adjustable)? Does that mean that during testing, f needs to be adjusted so that the detector is in close contact with the workpiece? Please give an answer, please give an answer
Our unit purchased a DR device this year. The focal length refers to the distance from the end of the X-ray head to the digital film (detector), and it certainly isn’t fixed. The detector being in close contact with the workpiece is also intended to minimize the crack detection angle.
I see that some companies have designed specialized equipment that can accommodate pipes within a certain range of diameters. However, the distance between the ray generator and the detector remains constant; is this appropriate when testing pipes of different diameters?
It is sufficient as long as the nomogram is satisfied or the calculation formula for the minimum focal length is met.