Measurements of muon flux in the Pyh\"asalmi underground laboratory
  The cosmic-ray induced muon flux was measured at several depths in the Pyh\"asalmi mine (Finland) using a plastic scintillator telescope mounted on a trailer. The flux was determined at four different depths underground at 400 m (980 m.w.e), at 660 m (1900 m.w.e), at 990 m (2810 m.w.e) and at 1390 m (3960 m.w.e) with the trailer, and also at the ground surface. In addition, previously measured fluxes from depths of 90 m (210 m.w.e) and 210 m (420 m.w.e) are shown. A relation was obtained for the underground muon flux as a function of the depth. The measured flux follows well the general behaviour and is consistent with results determined in other underground laboratories. 
T. Enqvist, A. Mattila, V. F\"ohr, T. J\"ams\'en, M. Lehtola, J.   Narkilahti, J. Joutsenvaara, S. Nurmenniemi, J. Peltoniem...