Neutrino radiation hazard at the planned CERN neutrino factory

This note briefly discusses the radiation hazard which may be posed by the neutrino radiation generated in the decay of an intense 50GeV muon beam circulating in the storage ring of a future Neutrino Factory. Of the various options which are being considered for the decay ring, for the present estimate the triangle-shaped one, with three arms of equal length, was taken into account. The neutrinos emerging from the ground along a direction which is the prolongation of the arm pointing towards the surface may represent a local radiation hazard. Assuming 10 21 muons per year, the annual dose equivalent will exceed 15m mSv.