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zoom RSS 福島第一原発から20km以上離れた場所の路上の黒い物体の分析結果に関する論文(2014年2月公開)

<<   作成日時 : 2014/06/03 19:13   >>

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飯舘村、南相馬市、浪江町の路上の黒い物体(black substances)。こんな重大なデータをなぜこの時期に発表するのか。その理由は、半減期をデータとしてきっちり示すことで、否定しようがないようにしておくためだろうと想像する。焦って出せば潰されてデマにされるから、念入りに準備しなければならなかったのではないか。あるいは、”解禁”されたという可能性も否定はできないが。

プルトニウム(238Pu, 239,240Pu)
アメリシウム(241Am)
キュリウム(242Cm and 243,244Cm)
といった超ウラン元素のアルファ線放出核種の名前が見えるが、私なりに最も重要だと思う部分を和訳してみると、以下のような感じになる。

"When the activity ratios among these transuranic nuclides were compared with those of core inventories (Units 1–3) ... , fairly good agreement was found, indicating that traces of transuranic nuclides, probably in the forms of fine particles, were released into the environment without their large fractionations."
            ↓
"(路上の黒い物体や散乱物の超ウラン元素の)成分比の1-3号機コアとのかなり良い一致は、超ウラン核種の痕跡が、大きく分離することなく、恐らく微粒子の形で環境中へ放出されたことを示唆"

もっと簡単に言えば、
「圧力容器の中身が派手に上空へ向けて噴き出したと理解しておくことで、特に大きな間違いはないですね」
ってことを、私は誰かに肯定して欲しい。
事態の深刻さ・重大さを比較すると、
 爆発して中身が噴出 >>> ドライベント > ウェットベント
という感じだと私は思うが、
棄民主義者にとってはどれも大した話ではないということも理解する。


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2014/06/14 17:03
http://behind-the-days.at.webry.info/201406/article_11.html

和訳「燃料棒の破片が2号機の外で発見され、現在ブルドーザで土をかぶせられている」(2011-4/7)
2011/09/29 19:36
http://behind-the-days.at.webry.info/201109/article_2.html




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Journal of Radioanalytical and Nuclear Chemistry
June 2014, Volume 300, Issue 3, pp 1045-1052
http://dx.doi.org/10.1007/s10967-014-3003-7

http://link.springer.com/article/10.1007/s10967-014-3003-7

Isotopic compositions of transuranic nuclides released by the Fukushima Dai-ichi Nuclear Power Plant accident: with emphasis on Cm isotopes

M. Yamamoto, A. Sakaguchi, S. Ochiai, T. Imanaka

Abstract
Isotopic composition of transuranic nuclides, with emphasis on Cm isotopes, were measured for environmental samples such as dust samples (black substances) from the roadsides and litter samples heavily contaminated by the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident. Low levels of 238Pu, 239,240Pu, 241Am, 242Cm and 243,244Cm were determined by α-spectrometry after radiochemical separation. These results, including radioactive Cs, provided an isotopic data set. When the activity ratios among these transuranic nuclides were compared with those of core inventories (Units 1–3) in the FDNPP estimated by the JAEA group, fairly good agreement was found, indicating that traces of transuranic nuclides, probably in the forms of fine particles, were released into the environment without their large fractionations. The obtained data may lead to more accurate information about the on-site situation (e.g., burn-up, conditions of fuel during the release phase, etc.), which would be difficult to receive otherwise, and on the dispersion and deposition processes of transuranic nuclides and the behavior of these nuclides in the environment.
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同じ著者らの別の論文
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Journal of Environmental Radioactivity
Volume 132, June 2014, Pages 31–46
http://dx.doi.org/10.1016/j.jenvrad.2014.01.013

http://www.sciencedirect.com/science/article/pii/S0265931X14000162

Isotopic Pu, Am and Cm signatures in environmental samples contaminated by the Fukushima Dai-ichi Nuclear Power Plant accident

M. Yamamotoa, A. Sakaguchi, S. Ochiai, T. Takada, K. Hamataka, T. Murakami, S. Nagao

Abstract
Dust samples from the sides of roads (black substances) have been collected together with litter and soil samples at more than 100 sites contaminated heavily in the 20-km exclusion zones around Fukushima Dai-ichi Nuclear Power Plant (FDNPP) (Minamisoma City, and Namie, Futaba and Okuma Towns), in Iitate Village located from 25 to 45 km northwest of the plant and in southern areas from the plant. Isotopes of Pu, Am and Cm have been measured in the samples to evaluate their total releases into the environment from the FDNPP and to get the isotopic compositions among these nuclides. For black substances and litter samples, in addition to Pu isotopes, 241Am, 242Cm and 243,244Cm were determined for most of samples examined, while for soil samples, only Pu isotopes were determined. The results provided a coherent data set on 239,240Pu inventories and isotopic composition among these transuranic nuclides. When these activity ratios were compared with those for fuel core inventories in the FDNPP accident estimated by a group at JAEA, except 239,240Pu/137Cs activity ratios, fairly good agreements were found, indicating that transuranic nuclides, probably in the forms of fine particles, were released into the environment without their large fractionations. The obtained data may lead to more accurate information about the on-site situation (e.g., burn-up, conditions of fuel during the release phase, etc.), which would be difficult to get otherwise, and more detailed information on the dispersion and deposition processes of transuranic nuclides and the behavior of these nuclides in the environment.
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福島第一原発から20km以上離れた場所の路上の黒い物体の分析結果に関する論文(2014年2月公開) Behind the Days/BIGLOBEウェブリブログ
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