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Positrons detect wing spar damage. (Tech Spotlight).

Advanced Materials & Processes,  August, 2002  by Yearsley, Kyle

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A reliable method for detecting and quantifying fatigue and other types of lattice-structure damage by means of positrons produced interstitially in the structure or component has been developed by the Department of Energy's Idaho National Engineering and Environmental Lab, and licensed to Positron Systems Inc.

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for commercial deployment. The technology, known as Photon Induced Positron Annihilation or PIPA, can detect and precisely measure (<1%) material damage at the atomic level, before cracks begin to develop. Detection of fatigue, embrittlement, thermal effects, and creep ...

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