Atomic Bomb versus Fukushima Nuclear Crisis
Hiroshima and Nagasaki are thriving cities today, despite the bombings of WWll. So, based upon that fact, a friend was arguing with me today that, all in all, what is happening in Fukushima will not have long lasting consequences.. Basically, his argument is that if radiation is so long lasting, how is it that people can live in the above cities?
I pointed out the long term effects of Chernobyl, but he wasn't convinced.
So, can someone explain how it is that Hiroshima and Nagasaki are habitable after having suffered the effects of the bombs, and how a disaster from a nuclear reactor is different?


Video on Bombs
Have you seen this short film on all the atomic bomb testing? You may feel in shock after watching it (nothing gory, just a map showing a timelapse of each bomb test, but it is emotional). It's well done - interesting visual and audio - and it puts it into perspective.
http://www.youtube.com/watch?v=4r2VIN4M6QU
Touches on your question
http://www.solarstorms.org/Hiroshima.html
Comparison?
So, does a scientist on this site have an answer as to why and how people were able to repopulate Hiroshima and Nagasaki? Was there-and is there-still measurable radioactive fallout in the ground, water, food?
And, given the fact that people have been happily living in those cities now for years, why should we expect, or why should we not expect,that Fukushima and any and all areas that have been the recipient of their fallout, will be affected for years and years like Chernobyl--and areas in Europe that were contaminated by Chernobyl's plumes.
Important note: Person challenging the whole idea that there will be long-lived consequences is a bright engineer from prestigious university and I cannot provide a sufficient answer.
Those atomic bombs were
Those atomic bombs were truly miniscule in payload when compared to the Fukushima power complex and its spent fuel. There is absolutely no comparison whatsoever.
Re: Those atomic bombs were
Please elaborate
"Taken together, the active
"Taken together, the active reactors and old cores are equivalent to 2000 atomic bombs of 500 kilotons each."
http://www.veteranstoday.com/2011/04/22/fukushima-2000-atomic-bombs/
For reference, Hiroshima had a payload of about 15 kilotons.
That quote is rather an
That quote is rather an English translation from here:
http://aipri.blogspot.com/2011/04/fukushima-2000-bombe-atomiche.html
hydrogen bomb vs. 100s of
hydrogen bomb vs. 100s of tons of weapons grade plutonium? The bombs expoded over the cities and the energy was spent in seconds. The reactors expoded on the ground and continue to generate toxic waste 24/7. This type of nuclear catastrophe doesn't knock down buildings, but does leave them contaminated to the point where you have to knock them down and rebuild.
bombs vs. radiactive fallout
Indeed, a bomb releases it's energy explosively in a matter of seconds, leaving behind a burnt and irradiated landscape, and a plume of radioactive fallout aerosols which typically are carried away downwind (assuming the blast was above ground and didn't penetrate the ground "bunker buster" style). This is a singular event with finite amounts of contaminants that largely are lofted high into the atmosphere, thus contaminating the air and soil anywhere downwind at finite levels for years (and permitting countries to detect even the slightest traces of nuclear accidents or testing, specifically the "illegal" above-ground variety atmospheric testing as practiced at Bikini or in Nevada some years ago... but I digress). While it is undeniable that victims exposed to a nuclear-bomb's radiative fury can and do suffer instant death or long-term radiation-burn consequences, much of that is due to exposure to an external radiation source (the bomb exploding in near vicinity), not due to ingested/inhaled fallout, though in fact bombs will also expose victims to fallout as well. However, it is the fallout which results in long-term consequences of ingested/inhaled radiation poisoning and the kinds of cancers that are being documented as a consequence of Nevada above-ground nuclear-testing and Chernobyl downwind fallout exposures (from Ukraine to Belarus to the Baltic and beyond), even without the horrific burns resultant from direct exposure to nuclear bomb blast radiation. The difference between a bomb and a nuclear meltdown is that the latter is the "weapon" that keeps on delivering fallout and cancer-risk (the ingested/inhaled radiotoxic particulates), in the form of emissions both into the atmosphere while the meltdown is in progress into the ground and groundwater continuing ad infinitum as long as the molten corium remains in situ and is not contained via some elaborate entombment structure(s), and ultimately into the food-chain and all materials which are part of our everyday lives. Because those contaminants spread so rapidly and widely, from a source that is vastly larger than any bomb delivers, and because those contaminants are so long-lived and virtually impossible to remove from the environment once spread, the risk of long-term internal exposure for the general public are much larger than is true for a bomb, and the public health consequences thus also a much greater concern... indeed, the difference between a bomb and the worst-case NPP catastrophe (Fukushima) is that in the former, you can rebuild, whereas the latter will render your country uninhabitable and unsalvagable for centuries to come... Having said that, I wish neither upon anyone, and cannot comprehend that anyone would ever come up with a risk-analysis which would enable the building of a Fukushima-style NPP. But someone did... and nobody will be held accountable (though everyone must pay).
Would it be possible to use
Would it be possible to use a small directed fission bomb to 'burn' all of the melting cores and fuel rods? How much of the fuel could be converted to non-radioactive plasma before the blast wave could disperse the material? Conventional explosives can be burned and they will not explode. Is it possible to do something similar with nuclear fuel? It is true that there would remain a large uninhabitable area following the blast, but that is what will happen anyway if TEPCO cannot clean up the mess in the next year or so.
I'm only an engineering
I'm only an engineering student but I would say that in order for an explosion to be considered we would have to agree that the burning of fuel will only produce more airborne radioactive particles, thus worsening fallout. So, any explosion sufficient in magnitude to turn plutonium to plasma would require energy equal to that of all fuel present. Put simply, the whole plant worth of fuel would have to explode as part of one nuclear blast. Unfortunately, this event is physically impossible and thousands of tons of fuel will be spread over the earth.
Let's just do what we did on the Pacific atolls. Dig a really big whole and bulldoze every radioactive area. Then put a containment over it. As for the reactors, I agree with the Japanese, it'll take 20 years to deal with it without a financial and human miracle of willpower. People from every country are effected by this why aren't we all there fixing it?