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Nevermind. The releases I found:

Windscale: 0.7 PBq
Lawrence Livermore 1965: 11 PBq (c. 15 times Windscale)
TMI: 90 PBq into the atmosphere (1900 PBq total)
Mayak/Chelyabinsk: 700 PBq (1000 times Windscale)
Chernobyl: 14,000 PBq (the bulk iodine and xenon)

Curiously, I found no data for the Tsar Bomba or Castle Bravo.

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Tue Jul 10th, 2007 at 05:53:00 PM EST
[ Parent ]
Is Mayak the one where they blew up an underground silo of solvent carrying radioactive waste by pumping the wrong chemical in it ?

Your number for TMI seems orders of magnitude higher than what I remember, sure it's the right unit ?

Pierre

by Pierre on Tue Jul 10th, 2007 at 06:47:18 PM EST
[ Parent ]
Yes Mayak = Kyshtym = Chelyabinsk-40. 1957. A level 6 accident.

TMI total release was very high but something like 99% (I don't remember the exact number but it was ridiculously high) of the release was "noble" gas - Kr, Xe, etc. - with extremely low to inexistent biological impact.

by Francois in Paris on Tue Jul 10th, 2007 at 08:09:44 PM EST
[ Parent ]
Yes, Pierre probably saw Caesium figures. A large part of the Chernobyl release was inert gas too, but there Iodine was of the same order of magnitude.

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Wed Jul 11th, 2007 at 05:11:01 AM EST
[ Parent ]
Upon checking another source, I am confused. It may be that the higher figure is the total into the atmosphere, and 90 PBq is another estimate for the non-noble-gas part. And of that, tritium is the bulk.

03

some 14 million curies of noble gases (~500 PBq) and 14 curies (~500 GBq) of I-131 were released during the course of the accident. About 50,000 curies (~2 PBq) of Kr-85 were vented from the containment and 2 million curies (~75 PBq) of tritium was released.


*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Wed Jul 11th, 2007 at 05:21:50 AM EST
[ Parent ]
I think those numbers match what I remember reading about TMI although the tritium number seems high.

What people were justifiably freaking out about was iodine with the bio-concentration in the thyroid. Turned out there was very little of it.

by Francois in Paris on Wed Jul 11th, 2007 at 04:39:57 PM EST
[ Parent ]
When thinking of military facilities in the US, I was thinking about the one in california, that has leaked into the watertable basically since WWII, and it's now showing up in the basements at distant gated communities, can't remember the name, but it was in the news about a year ago.

There is no way to assess the release accurately, but it is probably comparable, over time, to the worst releases of the russian military complex.

Pierre

by Pierre on Tue Jul 10th, 2007 at 06:50:54 PM EST
[ Parent ]
I believe you're referring to the city of Livermore, CA, home of Lawrence Livermore Labs.  There they make nuclear bomb triggers and advanced design weapons, and Los Alamos has a facility there as well.  They've found radioactivity in the water table under the entire area, but the population keeps swelling.

The labs are also about a kilometer from the western (windward) edge of the Altamont Pass wind resource area, so i've spent much time there over the years.  i ate lunch often at the Labs, because... well, i can be pretty dumb, and i got a thrill watching bomb designers eat and discuss baseball as if they were normal people.  (Full disclosure:  they do lots of other things at the labs besides bombs.)

"Life shrinks or expands in proportion to one's courage." - Anaïs Nin

by Crazy Horse on Tue Jul 10th, 2007 at 07:58:38 PM EST
[ Parent ]

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