Researchers use muography to map the thickness of sediment at the Shanghai Outer Ring Tunnel. (IMAGE)

American Institute of Physics

Researchers use muography to map the thickness of sediment at the Shanghai Outer Ring Tunnel.

Caption

The Shanghai Outer Ring Tunnel runs across the Huangpu River, with areas covered by mucky soil and silty clay (top). The researchers placed a portable muon detector within the tunnel to monitor muon flux as a way to measure the sediment buildup (bottom).

Credit

Khaw et al.

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