Small-single x-ray scattering of intensity much greater than that found with unirradiated graphite was observed with specimens of polycrystalline artificial graphite of re actor grade heavily irradiated at temperatures in the vicinity of 150 deg C. The intensity distributions were not sufficientiy accurate to give any reliable indication of the shape of the scattering centers. However, it appeared likely that in irradiated graphite there were disk-like aggregates of interstitial atoms, sandwiched between the graphite layers and formed by clustering of the atoms displaced by neutron bombardment.