Such a pretty mess isn't it ? This is Cesium 137
Watch at the 0:47 mark when the roof of the reactor building explodes.
2:00am 03/12/2011 - It's Now Been Confirmed - Japan has a big nuclear problem. Deadly Toxic Radioactive Cesium Is Leaking which indicates a meltdown of the core. The Nuclear Reactor is damaged and leaking Cesium 137.
