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The back-transformation needs to be built into the kriging step. You can't simply apply a transformation, perform kriging, then apply the back-transformation to the results. In other words, you should stick to the transformations that we've developed and integrated into the kriging: Log, Box-Cox, ArcSin, and Normal Score.
The Normal Score is the most functional type:
For ArcGIS 10, Gaussian Kernels is the most functional approximation type for Normal Score Transformation.