A team of scientists have successfully demonstrated the world's first cosmic-ray GPS to detect movement underground and in volcanoes which can potentially aid in future search-and-rescue missions.
The research team, led by Prof. Hiroyuki Tanaka from the University of Tokyo, has developed a wireless muometric navigation system or MuWNS, a novel wireless navigation technique.When cosmic rays enter the Earth's atmosphere, they collide with the atoms and molecules in the air, producing a shower of secondary particles calledMuons can penetrate and pass through solid objects, with the degree of penetration depending on the density of the material.
Tanaka and his team exploited this property of cosmic rays to map the interiors of hard-to-access places such as volcanoes, the core of nuclear reactors, and pyramids.Tanaka and his team had previously developed a predecessor to the MuWNS called the muometric positioning system . The muPS was used to detect seafloor changes using muons. It involved four surface-level reference stations and a receiver station on the ocean floor.
The reference and receiver detectors are synchronized using high-precision quartz clocks to prevent timing discrepancies and ensure accuracy in positioning. The team then tested their MuWNS system by giving a person the receiver detector in the basement of a building and placing four reference detectors on the sixth floor of the same building. The researchers successfully rebuilt the underground navigator's path by screening for cosmic rays picked up by the detectors and receiver.
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