Wednesday, June 8, 2011

("Now They Tell Us" Series) Strontium Was Detected 62 Kilometers from Fukushima I in April and May, Says Ministry of Education

Update, or rather, review: The numbers are much higher than what was found in the area inside the 10-kilometer radius (actually 2 kilometers from the plant, 68 becquerels/kilogram). The number for strontium-90 in Akogi in Namie-machi (250 becquerels/kilogram) is approaching the number found at Fukushima I Nuke Plant (570 becquerels/kilo).

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Does it take that long to analyze the soil samples for strontium? (I know, I know...)

Asahi Shinbun reports that radioactive strontium was detected in soil as far away as 62 kilometers from the plant. The samples were taken between April 10 and May 19.

What's hilarious in the article is the so-called expert's comment, basically saying "Where there's cesium there's strontium. So of course we see strontium in the soil. But don't worry, if you don't eat much cesium, observing the government's provisional limit which may or may not stays the same, you're OK."

Well, he had been awfully quiet about that bit of information until asked by the Asahi reporter who wrote the piece. Disingenuous of Asahi Shinbun also; it is the first time that I remember, that any newspaper has said "where there's cesium, strontium is supposed to be there also." Asahi had a chance to say so from the day one, but didn't bother.

Non-government, non-experts like the rest of the Japanese already suspected it from long ago, particularly when they knew that strontium, plutonium, uranium, even americium, of Fukushima origin had been detected in the US.

From Asahi Shinbun (12:00AM JST 6/9/2011):

 文部科学省は8日、放射性ストロンチウムが東京電力福島第一原子力発電所から62キロ離れた福島市など、福島県内11カ所の土壌で新たに検出されたこと を明らかにした。放射性セシウムが検出されたところでは、微量に見つかるとされており、それが証明された形だ。放射性ストロンチウムには半減期が長いもの があって、体に入ると長期間影響を及ぼす可能性があり、監視が必要だ。

The Ministry of Education and Science disclosed on June 8 that radioactive strontium had been detected at 11 locations in Fukushima Prefecture, including Fukushima City which is 62 kilometers away from Fukushima I Nuclear Power Plant. A small amount of strontium is supposed to be found where radioactive cesium is also found, and now it's been proven so. Some strontium radioisotopes have long half-life, and they could affect the body for long time if ingested.

 検出されたのは4月10日~5月19日に採取された土壌。福島市では半減期約29年と長いストロンチウム90が1キロあたり77ベクレル、半減期約50日と短いストロンチウム89が54ベクレル検出された。

Radioactive strontium was found from soil samples taken from April 10 to May 19. In Fukushima City, strontium-90 with half-life of 29 years was found in 77 becquerels per kilogram, and strontium-89 with half-life of 50 days was found in 54 becquerels per kilogram.

 最も多かったのは浪江町赤宇木で、それぞれ250ベクレルと1500ベクレル。北西部に36キロ離れた飯舘村では120ベクレルと1100ベクレルで、 これまでに20キロ圏内で検出されていた値よりも高かった。ほかに田村市、広野町、川内村、南相馬市、二本松市でもストロンチウムが検出された。文科省は 採取した土壌をさらに細かく分析するという。

The highest numbers come from the Akogi district in Namie-machi, with 250 becquerels/kg strontium-90 and 1,500 becquerels/kg strontium-89. In Iitate-mura, 36 kilometers northwest of the plant, 120 becquerels/kg strontium-90 and 1,100 becquerels/kg strontium-89 were detected; these amounts were even higher than those that had been detected earlier within 20 kilometer radius from the plant. Radioactive strontium was also detected from the soil samples from Tamura City, Hirono-machi, Kawauchi-mura, Minami-Soma City, Nihonmatsu City. The Ministry of Education and Science will further analyze the soil samples.

 放射性ストロンチウムはセシウムに比べ、炉心がより高温になってから溶け出し、気化する。それが検出されたことは、炉心が早い段階で溶け出し、その後に放射能の放出につながったことを意味するとみられる。

Radioactive strontium melts at a higher temperature than cesium to be volatilized. The fact that strontium has been detected would mean that the reactor core started to melt from the early stage of the accident, and then radioactive materials were released.

 ストロンチウムは人体に入ると、骨にたまる性質がある。原子力安全委事務局の加藤重治・内閣府審議官は「ストロンチウムはセシウムに対して一定の割合で 存在している。そのため、食べ物からの取り込み分はセシウムの規制値を守っていればストロンチウムについても影響はない。ただ、土壌から体内に取り込まな いよう注意すべきだ」と話している。

Once ingested, strontium tends to accumulate in bones. The Japanese government's Nuclear Safety Commission's spokesman Shigeharu Kato says, "Strontium exists at a certain ratio to cesium. Therefore, as long as the safety limit for cesium in food is observed, there is no ill effect from strontium. But caution is necessary not to ingest it from the soil."

The Nuclear Safety Commission: "We knew that."

I guess they didn't feel like announcing it.

10 comments:

netudiant said...

Wretched.
The presence of strontium is a significant incremental negative.
It is not obvious that the presence of cesium implies strontium, the melting points are very different, 28*C for cesium, about 770*C for strontium, so the vapor pressures are also quite different and one would expect cesium to spread much more widely.
The health impact of strontium, which as a calcium equivalent is readily absorbed by the body and incorporated into bone, is much greater than for cesium, which is a muscle tissue component only. For children, this is very bad, because the strontium cannot be purged from the bone once absorbed and incorporated.
So for the Fukushima prefecture, this is a disaster. No parent would want to raise their children in this environment.

arevamirpal::laprimavera said...

@netudiant,
What irks me the most is these experts and major newspapers, who now say "Of course we expected to see strontium where cesium flew and here it is! We was right!"

Much like Haruki "Detarame" Madarame of Nuclear Safety Commission patting himself on the back when he said "SPEEDI's simulations turned out to be right. They matched the actual numbers. Aren't we great?"

Something disturbing about this strontium detection though is the fact that higher concentration was found outside 20-kilometer radius. And that tellurium discovery without being accompanied by iodine and cesium.

Anonymous said...

Robbie001 sez:

I think it is safe to say the entire range of reactor inventory let fly to some degree and Japanese nuclear officials are slowly letting snippets of the belated facts sink in. In a couple of months they'll probably double the concentration numbers and list new isotopes. I'm sure if they "really" looked they'd find a broad range of unstable isotopes in various concentrations throughout the exclusion zone (and beyond).

Another thing to keep in mind is multiple mode daughter isotopes are produced during some decay chains. I doubt officials take the future radiation emissions into account.

http://en.wikipedia.org/wiki/Radioactive_decay#Decay_chains_and_multiple_modes

Anonymous said...

The various things that have been released... vary, in terms of physical/chemical properties. It is not at all surprising to find some things have migrated in entirely different patterns from others.

Tellurium oxide dust would not travel in the same way as cesium dissolved in water.

Anonymous said...

This info was sent to me late May: "We tested an air filter from a car in Tokyo. It full of particles of strontium, metallic zirconium and Zr alloys, iron and steel encrusted with terbium, yttrium, lanthanum, and neodymium. There are bismuth/rhenium particles. One nearly pure strontium particle is crusted with sodium chloride, a k a seawater."

arevamirpal::laprimavera said...

@anon at 4:19PM, was that info from Arnie Gundersen? He said something to that extent (not that detailed) in his interview with Chris Martenson the other day. Any link?

Matt said...

The problem is the lack of information. They found minute amounts of strontium. Well lets add up those amounts with all the other radioactive materials in the soil to get a TOTAL number of ALL radioactive becquerels per kilogram. They keep handing out one isotope at a time and it's quite clear that they are all lying.

Anonymous said...

@arevamirpal::laprimavera: Yes, indeed it was from AG, but it was an email, no link, sorry.

PS: thanks for the blog

Anonymous said...

As many people already mentioned, strontium is bad as it has a long biological half-life and doesn't get flushed out of the body easily.
It's a pity that radionuclide identification devices are prohibitively expensive, preventing 'amateurs' to do measurements and provide the information to the public through Pachube or other crowd-sourcing networks.
I only have a contamination monitor (measuring beta & gamma) and can confirm that the activity of certain materials is higher. e.g. Indoors: 0.4 - 0.7 cps; wooden structure on balcony: 4 - 5 cps; sand/sludge close to sink (outside): 10 -12 cps

Anonymous said...

The one saving grace from all this disaster is, all the government, TEPCO, and nuclear industry supporters are all breathing the same "safe" radioactive air, eating the radioactive foods, and drinking the radioactive water! So, they too, will die the same painful deaths!

So lying about the situation boys, isn't going to help you or your children or their children's children....classic losers!

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