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@Peter Melzer : but i have no idea towards your questions. it would be favourable to have constant and quantitative readings of these isotopes, but we only have them being mentioned.

@Peter Melzer have only seen your very first post... so bear with me.... yes those are excelent, as the clean up on the columbina river ???? was not sucseful, ilrelavent of the cost... but explains in detail the system tried that DID NOT work... Most important factor is I AM NOT LOOKING at cost, as much as do able.... to build a tank (ficticious numbers) say I tell the client will take 2000 manhours.. thats 250 days with 4 men working on it that 62.5 days to build.... you might be able to increase the labor to 10 men and do it in 25 days, but you can't just divide 250 days by 20 men and say you can build in 12.5 days..... and its a very hard concept for them,,,, part b can not go before part a etc... so we want to look more at manhours/avaliblity of materials, delivery vs cost.... cost is last .. I need to shut my computor off so I can get some work done .... I'll be back to nite...

5.6 EQ really close to plant now up on USGS. quakes.globalincidentmap.com

@fitter Indeed, cost and national boundaries should be no object when you're talking about saving your planet, but we've never seen it work out that way before.

@Peter Melzer @Edano The barium and lanthanum figures in the water under the reactors is at www.tepco.co.jp Strontium releases should be approximately the same amount as Ba-140. This is running at about 30% of Cesium-137. It indicates considerable corium-concrete interactions in #2 and #3. The Cobalt-60 under reactor #3 (which could only come from prompt criticality) was re-evaluated to nothing.

@all This article posted earlier says the megafloat already towed away 10,000 tons of water. I don't believe they have used the megafloat yet. www.washingtonpost.com

@Peter Melzer : i made a rough google search and found this:
"Mr. Hidehiko Nishiyama, Senior Counselor of NISA, at a press interview made on April 18, admitted that the some fraction of pellets appear to be molten. The basis of this assessment is through detection of radioactive species resulting from melting in 1F2 and 3, as well as hydrogen explosion occurred in 1F1 he explained.

The Nuclear Safety Commission, at its committee meeting held on April 18, presented more detailed basis of NISA’s explanation. The reason that they conclude melting of fuel pellets is due to the observation that:

(1) From 1F2, the nuclear species that should not have been released unless by melting were released. Tc-99m (T1/2=6h, 9E+04 Bq/cm3), La-140 (T1/2=2d, 1.9E+05), Ba-140 (T1/2=13d, 4.9E+05 Bq/cm3)" www.ambersharick.com
so they found specific elements before april 18. but i remember a different source maybe i find it.

@Bobby1 ah, you found it ! thx ! :)

@Edano We now know that #1 was melting down as well, I don't know if Tepco measured these isotopes or not under there.

@Bobby1 : i am still searching for these infos, but there is no official qualified report on these readings. i am sure they have exact readings, but they will not show them until they are urged to do so.

@radioguy , re "natural", the label only indicates that these radionuclides are members of the three natural chains of radioactive decay: www.google.com

Japan’s Tea Industry Facing Shortage as Nuclear Radiation Taints Shipments
Green Tea Sits On Display

Japan may face a shortage of green tea as radiation leaking from the crippled Fukushima Dai-Ichi power station tainted leaves, spurring the government to restrict shipments from four prefectures.
The government decided yesterday to curb shipments of dried tea leaves containing more than 500 becquerel per kilogram of radioactive cesium and ordered a halt in shipments from the eastern prefectures of Ibaraki, Chiba, Kanagawa and Tochigi where tainted produce was detected. Japan’s tea production, including fresh and dried leaves, was worth 102.1 billion yen ($1.3 billion) in 2009, according to the agriculture ministry.
One of the test results showed fresh tea leaves from Izu city in the prefecture contained 98 becquerel of cesium per kilogram, according to the Shizuoka website.
The government made the decision because green tea is also processed into seasoning for various food products including cookies and ice cream, said Taku Ohara at the inspection and safety division of the Ministry of Health, Labour and Welfare.

“As dried tea leaves could be consumed directly by humans, we need to test them and ban sales of tainted products,” he said today by phone.

“We have not tested dried tea leaves as they are used in the middle of tea processing and are not a finished product. We have tested fresh tea leaves and tea drinks,” said Toshiyuki Aoki, assistant director at the office of tea and agricultural production at the Shizuoka prefectural government. “We would like to decide how to respond through discussion with government officials.”
Full story: www.bloomberg.com

imagine: at the time the workers stepped into the "puddles" we already had 3 meltdowns and corium on the drywell bottom ...... makes me shiver.

The latest CTBTO readings from Takasaki www.cpdnp.jp indicate re-criticality (enhanced iodine levels) from May 22-26, and there are still significant amounts of lanthanum (La-140) and especially tellurium (Te-129 & Te-129m) being emitted.

Startup Kurion Ships Nuclear Clean Up Tech to Japan
Nuclear waste cleanup startup Kurion says it has shipped several hundred tons of its equipment that will be used to clean contaminated water at the Fukushima nuclear power plants in Japan that suffered damage in the wake of the earthquake and tsunami. Kurion says some of its engineers have already arrived at the Fukushima sites, and more will arrive over the next two weeks, and by June Kurion expects its radioactive water cleaning technology to be installed at the nuclear plants. We reported in April that Kurion was working on the Japanese nuclear disaster.

Kurion’s technology, and business plan, is to make the process of vitrification — turning nuclear waste into glass — modular, which makes it cheaper, faster and more efficient. Vitrification is the standard way to clean up nuclear waste, and Kurion essentially brings the technology to the waste tanks, instead of taking the waste to a massive centralized treatment plant.

Before Kurion turns the waste into glass, it uses a material to soak up the waste, which it calls “ion specific media,” and then shrinks the material down to a small enough size so that it can be turned into glass. Vitrification essentially permanently encapsulates the nuclear waste, and while it’s still radioactive, the waste can be stored and transported more easily.

Kurion says at the Fukushima plants, its technology will be used on radioactive contaminated water that is in the turbine buildings, as well as on new cooling water that is being added every day. Some of the more standard nuclear cleanup materials couldn’t be used because they don’t work with saltwater, and sea water was pumped into the Fukushima plants in order to cool the reactor in response to the disaster.
More: gigaom.com

Fukushima Water Has More Radiation Than Released Into Air
The water level in basements and trenches at Tokyo Electric Power Co.'s Fukushima plant rose and may contain more radiation than is known to have been released into the atmosphere in the worst nuclear crisis since Chernobyl.
The amount of contaminated water rose to about 105 million liters (28 million gallons) from 100 million liters on May 18, and may start overflowing after June 20, the company known as Tepco said in a statement today. Radiation in the water is estimated at 720,000 terabecquerels, general manager Junichi Matsumoto said at a media briefing in Tokyo.
With Japan's rainy season in full swing, heavy downpours threaten to flood the plant and leak more radiation into the sea, soil and air.
"The risk of overflow is as serious as the meltdown of reactor fuel rods that's already happened," Tetsuo Ito, the head of the Atomic Energy Research Institute at Kinki University in western Japan, said in a phone interview. "Tepco should've acknowledged this risk weeks ago and could've taken any urgent measures.
A water de-contamination unit being built at the plant will start operating after June 15 and an underground tank capable of holding 10 million liters will be ready by the middle of August, Tepco said in today's statement.
More: www.sfgate.com

@elainekirk Do we believe Tepco?

Mines and Mineral Processing Facilities in the Vicinity of the March 11, 2011, Earthquake in Northern Honshu, Japan pubs.usgs.gov

@elainekirk I think the point is we should search for that information whether we believe in TEPCO or not. We need to search data from independent sources. Belief in TEPCO is, as I see it at the moment, quite irrelevant. In what concerns faith though, I do hope TEPCO can sort this out soon (within a year).