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The X-ARAPUCA device is the baseline choice for the photon detection systemof the first far detector module of the DUNE experiment. We present the resultsof the first complete characterization of a small scale X-ARAPUCA prototype,which is a slice of a full DUNE module. Its total detection efficiency inliquid argon was measured with three different ionizing radiations: $\alpha$particles, $\gamma$'s and muons and resulted to be $\sim$2.2% when the activesilicon photomultipliers were biased at +5.0 V of over voltage, correspondingto a Photon Detection Efficiency around 50% at room temperature. This valuecomfortably satisfies the requirements of the first DUNE far detector module(detection efficiency $>$2.0%) and allows to achieve an energy resolutioncomparable to the one achievable with the Time Projection Chambers for energiesbelow 10 MeV, which is the region relevant for Supernova neutrino detection.

Liquid argon characterization of the X-ARAPUCA with alpha particles, gamma rays and cosmic muons