MACRO experiment: radioactivity test

MACRO experiment: radioactivity test

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Caption: Cosmic rays and magnetic monopoles research. A technician checks the radioactivity level at the MACRO (Monopole Astrophysics and Cosmic Ray Observatory) experiment in the Gran Sasso Laboratory, Italy, the largest underground laboratory in the world. MACRO will look for magnetic monopoles, exotic particles never seen so far, and highly energetic muons produced by the cosmic rays in the upper atmosphere. The Gran Sasso Laboratory lies under 1400m of rock which has a very low level of natural radioactivity and shields the detectors from low-energy particles created in the atmosphere by cosmic rays.

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Keywords: astrophysics, cosmic ray, cosmology, detector, detectors, gran sasso, italian, italy, macro exp., macro exper, macro experiment, magnetic monopole, particle physics laboratory, radioactivity test, underground research

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