Abstract
Muon Radiography (or muography) is a recent imaging methodology that uses cosmic muons to investigate the interior of large objects, such as volcanoes, mines or buildings. Some applications are intended to use muography to search for hidden cavities in the subsoil. In many cases the muon telescope needs to be installed underground, inside tunnels, excavated chambers or drilled holes. Usually places available to install the muon detector are difficult to access for people; we thus constructed a very compact cylindrical muon tracker to deal with this problem. Thanks to its shape the detector can be inserted in boreholes. It is 1 m high and has a 24 cm diameter; these dimensions are ideal to fit a realizable drilled well. It is composed of bar and arc-shaped plastic scintillators. The original geometry of sensitive elements allows to maximize the acceptance, minimizing the dead spaces. The new borehole cylindrical detector has been tested in laboratory and the result of a measurement of open sky muon flux is in good agreement with expectations. A first application on field is currently ongoing to validate the capability of the telescope to reveal the presence of underground voids.
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