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Ug Calc

In The App Store!

Ug Calc is a simple Geometric Unsharpness calculator for Industrial Radiography.

All you have to do is plug in the distance from the Object (source side of the object or weld) to the film and to the source distances, along with the source size (diagonal).

This is not a difficult calculation to make but using this app makes it simpler and no need to keep looking up formulas.

NOTE:  The source side of the object or weld on double wall exposure welds with Single Wall viewing is the inside surface of the pipe near the film.  Basically the wall thickness (and maybe reinforcement).

On other welds it is more obvious where the source side of the object or weld is.

Click on the image below to enlarge.

Example problem: What is the Ug when the weld to film distance is 0.5 inches and the weld to source distance is 8 inches with a source size of 0.180 inches?

Answer: 0.011 inches of Ug.   (Ug = (0.5 x 0.180)/8)