[anthony-wohali]

Many, many years ago we developed an RT test for very basic evaluation of SCC.
Used a piece of tube the same diameter and WT as the boiler tubes to be tested we had 10 x grooves machined longitudinally on the inside of the tube.
That tube was then x-rayed.
The reference graph then gave us 10 x different densities based on the different groove depths to compare with the depth of the SCC seen in the subsequent radiographs taken in the boiler.
I know my story is of no help as you are talking about very advanced techniques, just thought I would share.