China: Earthquake Buried 32 Sources of Radiation More than 30 sources of radiation were buried by debris from the massive earthquake in central China last week and all have either been recovered or safely cordoned off, state media reported Tuesday. A French nuclear expert said the radioactive sources likely came from materials used in hospitals, factories or in research, not for weapons. The Chinese government has previously said all nuclear facilities affected by the May 12 earthquake were safe and under control, but did not give any details about which sites were affected or whether any were damaged.