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The paper provides a brief review of modern sources of ultraviolet (UV) radiation used in fluorescent penetrant testing (FT). The differences in implementation of the method with different radiation sources (excilamps, mercury UV lamp and LED UV lamp) are revealed experimentally. It is shown that the XeCl excilamp is not inferior to other sources of UV radiation used in FT.

The overview of penetrant testing quality control is considered. Disadvantages of methods of manufacturing metal check samples are identify, e.g. the implementation of several defects of different sensitivity classes on a single sample. The paper addresses the technology of application of universal nonmetallic reference test blocks containing several artificially-induced defects in the form of cracks of different sensitivity classes for liquid penetrant testing to evaluate the performance of liquid penetrant testing.