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The magnitude of the recent spike in radiation, and the amounts of groundwater involved, have led Michio Aoyama, an oceanographer at a government research institute who is considered an authority on radiation in the sea, to conclude that radioactive cesium 137 may now be leaking into the Pacific at a rate of about 30 billion becquerels per year, or about three times as high as last year. He estimates that strontium 90 may be entering the Pacific at a similar rate.
Source: Wired Magazine
Cesium 137′s half-life — the time it takes for half of a given amount of material to decay — is 30 years. In addition to that, cesium-137’s total ecological half-life — the time for half the cesium to disappear from the local environment through processes such as migration, weathering, and removal by organisms is also typically 30 years or less, but the amount of cesium in soil near Chernobyl isn’t decreasing nearly that fast. And scientists don’t know why.
It stands to reason that at some point the Ukrainian government would like to be able to use that land again, but the scientists have calculated that what they call cesium’s “ecological half-life” — the time for half the cesium to disappear from the local environment — is between 180 and 320 years.
To give an example, cesium 137 with a half-life of 30.17 years is transformed into cesium 136 with a half-life of 13 days.
Read more: www.physicsforums.com...
Pimpintology
Just when you think you know it all about radioactivity. I had no idea. Thanks for the update.
Pimpintology
I tried making this point at the time but it seems to be too complex for anyone to understand.
Pimpintology
I also think this is how it's managed to affect the west coast of the USA and the Ocean as much as it has, as well as Canada.
. . . a nuclear physicist stated to MSNBC International, on condition of anonymity, that the situation at Fukushima can best be described as an open air nuclear power plant in meltdown mode, with the cooling water being pumped directly into the ocean.
pasiphae
on page 2 of this NYT article:
www.nytimes.com...
i have not read that anywhere else before..... it's all been about waste water and not what is going out into the air.
the very last paragraph is also notable:
The magnitude of the recent spike in radiation, and the amounts of groundwater involved, have led Michio Aoyama, an oceanographer at a government research institute who is considered an authority on radiation in the sea, to conclude that radioactive cesium 137 may now be leaking into the Pacific at a rate of about 30 billion becquerels per year, or about three times as high as last year. He estimates that strontium 90 may be entering the Pacific at a similar rate.
.In terms of contamination the most serious radionuclide has been caesium-137, which has a half-life of about 30 years.
Tepco said that approximately 10 PBq of this isotope was released to the air. Another 10 PBq of caesium-134 was also released to air, but it has lower contamination potential due to a shorter half life of only two years.
Noble gases amounting to 500 PBq were also released during the accident, but these do not represent a contamination risk or health issue away from the site because they are not biologically active, are quick to decay and disperse easily in the atmosphere.
Similarly, releases to sea have not resulted in contamination beyond the plant's immediate area because the mixing power of ocean currents has dispersed the substances beyond the limits of detection in seawater samples. Tepco estimated that 11 PBq of iodine-131, 3.6 PBq of caesium-137 and 3.5 PBq of caesium-134 were released.
Revisions
The first estimates made shortly after the accident put releases of iodine-131 at 130 PBq. This was raised in June 2011 to 160 PBq and the latest figures have it at 511 PBq.
For caesium-137, however, the estimates grew from an initial 6.1 PBq to 15 PBq but have now been revised downwardly to 13.6 PBq.