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The γ-ray flux in the Frejus underground laboratory has been studied using an NaI detector surrounded by different diagonostic shields. Below 4MeV, the spectrum is dominated by radioactivities in the surrounding materials and rocks. Between 4 and 6MeV, the shape of the spectrum is well explained by U, Th and daughters, which are internal contaminations in the NaI crystal. Between 6 and 10MeV, the...
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