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I had a fascinating read about Alvarez "x-raying" the great pyramid in Gizeh in the 1960ies using cosmic muons:
www2.lns.mit.edu/fisherp/AlvarezPyramids.pdf
The technique has been refined and used even to make tomographies of a volcano in Japan.
What I wonder: To obtain the direction of the muons, one needs two ionization events. Isn't the probability for two ionizations in the spark chamber very low for muons which are so energetic that they can run unscattered trough the whole pyramid or a volcano?
www2.lns.mit.edu/fisherp/AlvarezPyramids.pdf
The technique has been refined and used even to make tomographies of a volcano in Japan.
What I wonder: To obtain the direction of the muons, one needs two ionization events. Isn't the probability for two ionizations in the spark chamber very low for muons which are so energetic that they can run unscattered trough the whole pyramid or a volcano?