[en] Silicon diode detectors - strip arrays, two-dimensional pixel arrays, and single large pad detectors - hold much promise in tracking and calorimeter applications at future hadron colliders. Because of the very high particle fluxes and high energies, radiation damage problems will impose important limits on detector placement and lifetime. Low energy neutrons are particularly likely to damage silicon devices. Experimental data on neutron fluences formed in hadronic cascades in an instrumented dump are presented and compared to simulations. Implications for the use of silicon detectors in hadron colliders are explored