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An inspection device developed at Pacific Northwest National Laboratory uses a sonar-like sensor to look through the end of fasteners to develop images of small cracks and corrosion features. In this image, the bolt's threaded end is centrally located with the sensor positioned just above the bolt.

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Document Title: Ultrasonic Inspection Device
Category: Nuclear Research and Facilities
Media Type: Photos
Date of Image/Photo: December 2000
Background: Referenced in Winter 2000 TechNotes: http://www.pnl.gov/news/notes/winter00.htm
URL of this page: http://picturethis.pnl.gov/picturet.nsf/by+id/AMER-4S8ND7

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