] Today's visit was the team's second to Tuwaitha. It
] located and identified four radioactive areas. The first
] was a storage building in what appeared to be a research
] area. There, the team found a lead-lined container that
] held Cesium-137, which measured the highest source of
] radiation detected today -- about 2.8 millirem per
] hour. Normally, it takes about 1 rem per hour before
] health hazards are a concern.

More information about the area where the looting of radioactive material at Tuwaitha took place.

New York Times: U.S. Experts Find Radioactive Material in Iraq