1602: US nuclear expert Joseph Cirincione tells CNN the full picture of what it happening at the Fukushima No. 1 reactor has yet to emerge: "The big unanswered question here is whether there's structural damage to this facility now. We saw the explosion early this morning. Are there other structural damages that may make a meltdown all but inevitable? We don't have any information from the power company on that."
Doesn't sound good, but there's so little information coming out it's hard to establish the situation.
The problem is that the uranium in the reactor has a half life of 4.5 billion years and releases high energy gamma photons.