Industrial Applications of Positron Annihilation
J. Phys. IV France 05 (1995) C1-111-C1-117
Positron Annihilation for the Non-Destructive Assessment of the Early Stages of DamageM.T. Hutchings, D.J. Buttle, R. Colbrook, W. Dalzell and C.B. Scruby
NDT Department, AEA Industrial Technology, 521 Harwell, Didcot, OX11 0RA, U.K.
Positron annihilation γ-ray lineshape analysis is one of the few techniques which can provide an early warning of incipient materials degradation in metallic components. The National NDT Centre at AEA Technology Harwell has developed a portable NDT system, the Positron Annihilation Lineshape Analysis (PALA) System, which can be used to carry out measurements both in the laboratory and at external sites. The system utilises the narrowing of the annihilation gamma ray lineshape, which occurs if the annihilation event occurs near vacancies in the lattice of a metal, to give information on the early stages of damage. A brief description of the PALA system is given, and its use to measure plastic damage in a number of cases illustrated.
© EDP Sciences 1995