Many successful flaw sizing applications have been reported on various ultrasonic testing (UT) for the cracks detected in in-service stage. But due to the configuration of the component which is difficult for scanning with search units, other appropriate sizing technique is required. Since nowadays there are some digital imaging processes on radiographic testing (RT) and real-time calculations with personal computer available, RT were considered to be the most relevant ones. Practical experiments have been performed to verify the capability of an improved RT technique named "GUCHI" (Geometric Unravel for Crack Height Image) for sizing. Feature of this technique is that base line marker such as small diameter copper wire shall be placed on the crack, and twice of exposures shall be performed for the crack. The sources are positioned in parallel to a film or an imaging device. The size of crack will be estimated by several theoretical calculations with geometrical arrangement of taking radiograph and dimensional data measured on each radiograph. Digitizing System is useful for flaw sizing.This paper presents the fundamentals of the GUCHI technique and data obtained from experiments on the test specimens with fatigue crack, surface planar flaws embedded in weld and artificial EDM slits.1) Application of NDT Techniques for Industrial Field. 2) Japan Welding Engineering Society

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