Also: muography, cosmic-ray muons, Khufu
Cosmic-ray muons pass partly through stone, letting scientists x-ray huge structures.
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Alvarez and colleagues searched for hidden chambers in the Second Pyramid using cosmic-ray detection.
As reported in: Alvarez, Anderson, Bedwei et al. (1970). Search for Hidden Chambers in the Pyramids. Science. doi:10.1126/science.167.3919.832
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Morishima and colleagues used cosmic-ray muon radiography to discover a large void in Khufu's Great Pyramid.
As reported in: Morishima, Kuno, Nishio et al. (2017). Discovery of a big void in Khufu’s Pyramid by observation of cosmic-ray muons. Nature. doi:10.1038/nature24647