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Atomic bomb? >> a hydrogen bomb is up to a thousand times more powerful. you'll also hear the term therm nuclear. a hydrogen bomb is called a thermo nuclear bomb. it's different in that it has a second stage reaction that moog fiez the force. atomic use figures or atom splitting. hydrogen bombs add fusion to produce the second much more powerful blast. i'll give you a sense of how much more powerful it is. the regular atomic bomb that was dropped on hiroshima was 15 kilo tons. it has the explosive force of 15,000 tons of dynamite. north korea's previous tests ranged between 1 kill ton to 20 ki...

Hydrogen and atomic bomb? a hydrogen bomb is up to 1,000 times more powerful. a hydrogen bomb is thermonuclear bomb. a second stage of reactions magnifies the force. here is what atomic bombs do, they use fission or atom splitting. hydrogen add fusion of atoms for a second more powerful blast. for example, the regular atomic bomb dropped on hiroshima had an explosive force of about 15,000 tons of dynamite, 15 kilo tons. hydrogen bomb has estimated force of 120,000 tons of dynamite. it is a substantially more powerful bomb. the issue here is whether they are telling the truth about this and the...

Meters and it would be a relatively short duration of the order of an hour or so. compare that with chernobyl, which is a really serious event, where the top blew off the reactor. >> reporter: the chernobyl accident 25 years ago spewed a radioactive cloud over hundreds of miles, but it's thought this is highly unlikely in japan. mainly because the japanese reactors are better protected. even so, how far could any radiation spread? the winds have been changeable, but luckily, the forecast now says they'll blow out to sea. david shukman, bbc news. >> a lot of people are comparing this to chernob...