Detection of corrosion on aircraft components by neutron radiography
Aluminium components and structures of aircraft are susceptible to various types of corrosion due to ageing, frequent changes of environment and moisture. Most of the corrosion types occurring on, or in, aluminium structures of aircraft contain hydrogen. Neutron radiography, therefore, provides a very sensitive and informative imaging method for the detection and investigation of corrosion attack. Prior to a systematic study using both thermal and subthermal neutron radiography for imaging corrosion, the detection capabilities of subthermal neutron radiography have been investigated at the High Flux Reactor (HFR) Petten. The sensitivity of hydrogen detection in metal was demonstrated by microdensitometric evaluation of neutron radiographs taken from zircalloy tubes with different hydrogen loadings of the inner wall. Subthermal neutron radiography has a higher imaging potential, due to the higher linear attenuation coefficients of hydrogen for subthermal neutrons in comparison to thermal neutrons. This paper highlights the results of the investigation on the basis of selected examples from the study and gives an outline of the anticipated programme for a systematic study.
Bibliographic Reference: Paper presented: Fourth World Conference on Neutron Radiography, San Francisco (US), May 10-17, 1992
Availability: Available from (1) as Paper EN 36858 ORA
Record Number: 199210800 / Last updated on: 1994-12-02
Original language: en
Available languages: en