  We evaluate the neutron and muon fluxes produced in the ILC beam dumps by
Monte Carlo simulations and discuss their potential use in irradiation fields.
We show that the beam dumps can provide high-intensity neutron and muon fluxes
with spectra quite similar to secondary cosmic rays, which are suitable for
soft error studies. The beam dumps deliver neutrons about $10^{11}$ times the
secondary cosmic rays on spaces perpendicular to the beam axis and muons $10^8$
times downstream of the beam dumps in the initial phase of the ILC. Large-area
irradiation of 1\,m$^2$ or more is possible. Differences in the energy
distribution of muons in electron and positron beam dumps are also discussed
for particle physics experiments.
