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The subthermal neutron radiography capability of the Petten High Flux Reactor (HFR) has been employed as a non-destructive inspection technique in attempt to explain the burn marks that were discovered during the post flight visual inspection of the Hubble Space Telescope Solar Array.
Radiographic imaging with neutrons was chosen because it reveals other details and images other materials than visualized by X- or gamma-ray-based radiography.
The evaluation of the burn marks, as shown on the neutron radiographs, revealed that less material is present in these areas. the neutron radiograph of the burn mark on the Inner Buffer Assembly also shows materials displacement (ie a concentration of silver and adhesive in certain areas outside the burn mark, possibly caused by the gas pressure generated during the burning process). The standard X-ray image does not show these details. .

Additional information

Authors: MARKGRAF J F W, JRC Petten (NL);GERLACH L, European Space Agency, Noordwijk (NL);ROBBEN A P, European Space Agency, Noordwijk (NL);VIOLIN F, European Space Agency, Noordwijk (NL)
Bibliographic Reference: Paper presented: Fifth World Conference on Neutron Radiography, Hahn Meitner Institut, Berlin (DE) June 17-20, 1996
Availability: Available from (1) as Paper EN 40001 ORA
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