Schematic illustration of cosmic-ray muons penetrating the overburden from various angles. (IMAGE)
Caption
. Schematic illustration of cosmic-ray muons penetrating the overburden from various angles.
Muons continually bombard the ground at a known rate and angular distribution. As muons lose energy when passing through matter, their flux is attenuated depending on the integrated density along their path. A higher-than-expected flux from a specific direction indicates reduced attenuation, suggesting the presence of a void or low-density region (marked here as yellow lines). The muon telescope detects these angular flux variations to create maps of subsurface structures.
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