Geometric unsharpness
A radiation source is not point-like and always has an area of several millimeters, and therefore cannot produce a sharp image. Smaller dimensions of the radiation source produce sharper images on the film.
Geometric unsharpness cannot be completely eliminated because there are no point-like light sources.
One way to reduce geometric unsharpness is to increase the distance between the radiation source and the surface of the test object. The greater the distance from the radiation source, the smaller the geometric unsharpness.
Another way to reduce geometric blurring is to bring the film as close as possible to the surface of the test object.
In other words, keep the distance between the surface of the test object on the source side and the film as small as possible.
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