Muon radiography of large industrial structures

To date there have been a few sporadic attempts to exploit the immense penetrating power of cosmic ray muons to radiographically probe the internal structure of very large objects ranging from ancient pyramids to active volcanoes. Recently, application to security problems has been described, but the very low muon flux limits more general use. However muons have potential uses for examining very large industrial structures where long measurement times are acceptable, and such possibilities are being investigated.A cosmic ray telescope and recording system has been constructed and is being employed on simple model systems to validate Monte Carlo predictions, and results obtained so far will be described.