Hydrogen may have caused Japan nuke blast: Experts

If the hydrogen has ignited,then it is gone,it doesn’t pose any further threat.

As far as we know there is no particular danger from radiation leaks. There may be,but we don’t know that. There is no reason to suppose that there must be because of that,Hore-Lacy said.

Japan’s government said radiation had leaked from stricken 40-year-old Daiichi 1 reactor plant in Fukushima,north of Tokyo,after an explosion blew the roof off the facility in the wake of a 8.9-magnitude earthquake,raising fears of a meltdown.