Evaluation of plating thickness standards

Existing aluminum-on-Kapton plating thickness standards have been found adequate to support current requirements when used with the Geiger-Muller detector. Data acquired with a scintillation detector indicate errors could result unless the geometry of the plating thickness standards closely duplicates the part geometry. Synthetic plating thickness standards, artificial standards that duplicate the beta-backscatter response of a thickness of material on a given substrate, were fabricated and evaluated. Because of use limitations, they were judged unsuitable for routine inspection