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Recent developments of the nuclear emulsion technology led to the productionof films with nanometric silver halide grains suitable to track low energynuclear recoils with submicrometric length. This improvement opens the way to adirectional Dark Matter detection, thus providing an innovative andcomplementary approach to the on-going WIMP searches. An important backgroundsource for these searches is represented by neutron-induced nuclear recoilsthat can mimic the WIMP signal. In this paper we provide an estimation of thecontribution to this background from the intrinsic radioactive contamination ofnuclear emulsions. We also report the induced background as a function of theread-out threshold, by using a GEANT4 simulation of the nuclear emulsion,showing that it amounts to about 0.06 neutrons per year per kilogram, fullycompatible with the design of a 10 kg$\times$year exposure.

Intrinsic neutron background of nuclear emulsions for directional Dark Matter searches