Neutron Flux: Free neutron flux levels were measured by Ohio State University (Boyd, et. al., Nuclear Instruments and Methods in Physics Research, A 399, 1997, pp 269-274) at 332 +/- 148 neutrons/m2/day. Thermal and epi-thermal neutron flux levels were measured at 115 +/- 22 neutrons/m2/day.
Radon: With such low levels of natural Uranium, and with high constant ventilation, Rn-222 levels in the WIPP underground are dominated by surface air concentrations (Rn-222 < 7 Bq/m3). Learn how the ventilation controls provide fresh air from the surface and keep it flowing through the experiment gallery, and separate it from air that flows near waste handling and disposal operations.
Muon Flux: For overburdens greater than about 100 mwe, neutrons from fission and (alpha , n) reactions dominate the thermal and epi-thermal energies. However, the much harder to measure flux of energetic neutrons created by nuclear capture of negative muons in deep inelastic muon-nucleus scattering is chiefly a function of muon flux. At WIPP's depth, a muon flux of about 2x10-3 /m2/s (6x10+4/m2/yr) is expected.