  We describe a simple procedure to estimate the high-energy neutrino flux from
the observed gamma-ray spectra of galactic cosmic ray sources that are
transparent to their gamma radiation. We evaluate in this way the neutrino flux
from the supernova remnant RX J1713.7-3946, whose very high-energy gamma-ray
spectrum (assumed to be of hadronic origin) is not a power law distribution
according to H.E.S.S. observations. The corresponding muon signal in neutrino
telescopes is found to be about 5 events per square kilometer per year in an
ideal detector.
