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Kobe U. Prof: Radiation is concentrating on surface — 23 µSv/hr above dirt in roadside drain far from meltdowns — Can’t decontaminate concrete or asphalt, must remove it all

Published: October 5th, 2011 at 7:59 am ET
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SOURCE: 300,000 Bq/Kg of Radioactive Cesium from Soil in Fukushima City, EX-SKF, October 4, 2011

[...] Judging from [Kobe University Professor Tomoya Yamauchi's] air radiation survey (in Japanese), this particular location looks like the one that had 23 microsieverts/hour radiation at 1 centimeter off the surface of the dirt in the roadside drain. Professor Yamauchi hypothesized that radioactive cesium from surrounding mountains and forests washes down the drain after the rain, and naturally gets concentrated in the dirt. [...]

In my communication with Professor Yamauchi, I asked if the decontamination as currently practiced in Fukushima works at all, given the non-result in Watari District which he surveyed. [...]

He also said that spraying water with high-pressure washers hardly work at all on concrete and asphalt surfaces, as radioactive cesium is now deeply embedded in the concretes and asphalt. The only way to decontaminate concrete and asphalt, the professor said, was to physically remove all concrete structures – houses, fences, pavement, etc., which he said would destroy the neighborhood. He is of the opinion that all the residents in the district should be evacuated first, with the government paying for the cost, and the experts should get to work to truly “decontaminate”. [...]

Professor Yamauchi’s air radiation survey (Japanese)

６月の調査で見つかった40,000 Bq/kg を超える汚染土壌が堆積していた道路の側溝はそ のまま放置されていた。堆積した土壌表面の線量は６月の7.7 μSv/h から22 μSv/h に、11 μSv/h から23 μSv/h に上昇していた。降雨と乾燥とによる天然の濃縮作用が継続している。

Babelfish Translation

The side groove of the road which the pollution soil which exceeds 40,000 Bq/kg which are found in June investigation has accumulated was that way left. The dose of the soil surface which it accumulates from 7.7 μSv/h of June in 22 μSv/h, from 11 μSv/h rose in 23 μSv/h. The natural concentration action with by the rainfall and drying continues.

Google Translation

Here is where the previous measurements were taken most contaminated soil, it is per kg Becquerel was more than than 40,000. Dose were collected in surface soil is also such 7.7μSv / h Was recorded was 11.5 μSv / h, and they are nearly at the expiration of three months and then 20 was over μSv / h. This has not been decontaminated, the concentration was a natural progression. Rain It seems that the influx of radioactive cesium from the nearby forest at each.

Read more on the survey here: Kyodo: High dosage of cesium similar to Chernobyl evacuation levels found in large city 60 km fom meltdowns — 307,000 Bq/kg in soil on Sept. 14

Published: October 5th, 2011 at 7:59 am ET
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October 5th, 2011 | Tags: | Category: Outside Tokyo
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