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This document specifies the principles for the tandem technique and the longitudinal-longitudinaltransverse (LLT) wave technique for the detection of discontinuities perpendicular to the surface or almost perpendicular to the surface. The general principles required for the ultrasonic testing of industrial products are described in ISO 16810. The tandem or LLT techniques can be used for the detection of embedded planar discontinuities. This document has been prepared for the testing of metallic materials with a thickness between 40 mm and 500 mm with parallel or concentric surfaces. The procedures provided in this document may be used for testing of other materials or smaller thickness if special measures are taken according to a written testing procedure. Phased array techniques can also be applied for the tandem technique and the LLT technique, but additional steps or verifications can be needed.

ISO 16827:2012 specifies the general principles and techniques for the characterization and sizing of previously detected discontinuities in order to ensure their evaluation against applicable acceptance criteria. It is applicable, in general terms, to discontinuities in those materials and applications covered by ISO 16810.

The document specifies requirements for the dimensions, material and manufacture of a steel block for calibrating ultrasonic test equipment used in ultrasonic testing with the phased array technique

ISO 15708-1:2017 gives the definitions of terms used in the field of computed tomography (CT). It presents a terminology that is not only CT-specific but which also includes other more generic terms and definitions spanning imaging and radiography. Some of the definitions represent discussion points aimed at refocusing their terms in the specific context of computed tomography.

ISO 15708-2:2017 specifies the general principles of X-ray computed tomography (CT), the equipment used and basic considerations of sample, materials and geometry. It is applicable to industrial imaging (i.e. non-medical applications) and gives a consistent set of CT performance parameter definitions, including how those performance parameters relate to CT system specifications. ISO 15708-2:2017 deals with computed axial tomography and excludes other types of tomography such as translational tomography and tomosynthesis.

ISO 15708-4:2017 specifies guidelines for the qualification of the performance of a CT system with respect to various inspection tasks. It is applicable to industrial imaging (i.e. non-medical applications) and gives a consistent set of CT performance parameter definitions, including how those performance parameters relate to CT system specifications. ISO 15708-4:2017 deals with computed axial tomography and excludes other types of tomography such as translational tomography and tomosynthesis.