City near Tokyo sets maximum radiation dose for children — Averages out to .31 microsieverts per hour

Published: June 21st, 2011 at 5:00 am ET
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City in Saitama Prefecture sets independent maximum radiation dose for children, Mainichi, June 21, 2011:

KAWAGUCHI, Saitama — The city government here has set the maximum radiation dose for children at 1.64 millisieverts per year, making it the first local government in Japan to implement its own radiation exposure standard.

The tentative figure announced on June 20 is based on the International Commission on Radiological Protection (ICRP)’s 1 millisievert recommended maximum exposure to man-made radiation sources, plus Japan’s average background radiation dose of 0.34 millisieverts and the average 0.3 millisieverts of annual exposure to cosmic radiation.

According to the Kawaguchi city government, the new annual exposure limit breaks down to a maximum hourly dose of 0.31 microsieverts, assuming a child spent eight hours a day outside. [...]

Published: June 21st, 2011 at 5:00 am ET
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22 comments to City near Tokyo sets maximum radiation dose for children — Averages out to .31 microsieverts per hour

  • nomade

    There’s a new live webcam on the Tepco site since yesterday…geiger counter readings.

    http://atmc.jp/geiger/

    There are several cities you can check.

    If you happen to be in France you must select the English language option because otherwise the live feeds (supposedly) are taken over by adverts in French. I kid you not.

    Can any IT experts out there explain this very strange phenomena? Is France hacking the Tepco site?


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  • nomade

    PS When I first started looking at this feed about 20 minutes ago the readings on the Iiate Village webcam were much higher than the others (about 4mSv) and the image was heavily pixelated. The other webcams are quite clear.

    The readings on that gieger counter then dropped down to under 1mSv and the image became merely blurred.

    Strange.

    Also there’s sound on one of the feeds… I think it’s the Iitate one but not sure. Heard people talking and an infant crying.


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  • maaa

    I find it hard to believe any level of radiation other than normal background radiation is legal. No level of radiation is safe. Is the government trying to save Tepco at the cost of its people?


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  • nomade

    Have there been any studies comparing the toxicity of naturally occurring radioisotopes compared to man-made ones?

    Just wondering because isotopes released by nuclear fission (eg Strontium 90, Cesium 137 and Iodine 131) affect different parts of the body and cause different types of cancers.


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    • Fall out man!

      Saw a report on Chernobyl children, and some other reports. From what I picked up these effects are most likely…

      Strontium 90 – bone cancer and leukemia
      Cesium 137 – The most stunningly horrible birth defects of all sorts.
      Iodine 131 – Thyroid cancer, thyroid problems, still births, dead babies. Blamed for a massive drop in the US birth rate after Chernobyl.


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  • milk and cheese milk and cheese

    So it’s official. Japanese society does not care about their children’s future. How odd for a country with a rapidly ageing population. How sad for the children.


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    • maaa

      Actually I’ve been wondering what if the 0.3 microsievert of radiation per hour consists of 90% plutonium, will that still be considered legal? If I’m wrong, pls enlighten me experts.


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      • Fall out man!

        When Japan’s number government appointed head of medicine Dr Shitinya can tell the Japanese that people with a positive attitude are unaffected by radiation, then I guess anything is legal. Furthermore, if anyone gets sick, you can blame that person for their negative attitude, not that harmless Plutonium!!!!!


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  • Nigwil

    At 19:26 Tokyo time the Fukushima meter is showing 0.38 microsiverts (uS) and the Liltate metre 0.667 uS! Both above the Kawaguchi city’s exposure limit.

    And as y’all say these meters appear to be in side.

    With the reactor buildings at Fuku all vigorously steaming away and drifting west, goodness knows what its like outside in the softly falling rain!

    Get out get out get out!


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  • Nigwil

    At 19:34
    Fukushima peaking 0.38 uS

    Liltate peaking 0.73 uS

    sigh…


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      • These are indoors so rent they only picking up gamma? (through wall penetration).

        I noticed the california rad net / ustream-posting, that was an obvious deterrent from actual levels… If we are seeing a 50 – 80 inside a box, we can only infer things are much worse outside the box…

        by placing these monitors indoors, they are safely away from alpha and beta emitting particles. But gamma rays penetrate 6 feet of mass…

        So this is a cleaver rouse that needs further explanation to the unknowing observer.


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        • Fall out man!

          If that reading is correct, and is background radiation, not just a hot spot, then surely evacuation will have to happen soon. That is if its not just a hot plume passing through temporarily. It looks bad for the nuke industry to evacuate again, but it will look worse if the hospitals overflow with irradiated patients.

          Mind you, if the media won’t report it, then I don’t suppose it matters to TEPCO.


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  • fuckyoushima

    this is still incompetence.

    this is not like an x-ray machine here… the ambient dose is probably irrelevant when particles are floating around and getting on peoples shoes and on their food.

    countless will be sacrificed on the altar of status quo inertia.


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  • Dr. Mark Sircus bearer of tragic radiation news

    No way to avoid tiny hot particles

    Should US West Coast residents be worried?

    Prestigious doctor: US nuclear ‘Baby valley of death,’ Millions to die (video)
    June 20, 2011.
    Continue reading on Examiner.com Prestigious doctor: US nuclear ‘Baby valley of death,’ Millions to die (video) –
    http://www.examiner.com/human-rights-in-national/prestigious-doctor-japan-us-nuclear-valley-of-death


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  • Reactor Concepts Manual Radioactive Waste Management

    Lots of tech inf. and pictures of …

    10 CFR Part 20 Dose Standards
    2 millirems in any one hour from external sources in an
    unrestricted area
    100 millirems in a calendar year
    (sum of external and internal radiation)
    in a controlled or unrestricted area
    10 CFR Part 50 Design Objectives
    Liquids
    3 millirems/year to the whole body
    10 millirems/year to any organ
    Gases
    5 millirems/year to the whole body
    15 millirems/year to the skin
    Solids and Iodine 15 millirems/year to any organ

    Chapter 9, 10 CFR Part 20 states that the licensee must control radioactive material such
    that no member of the public in an unrestricted area receives a dose of 2 millirems in any one hour from
    external sources or 100 millirems in a calendar year from external and internal sources in a controlled
    or unrestricted area. This control of radioactive material would also include the release of radioactive
    material to the environment, air, or water.
    In addition to the limits of 10 CFR Part 20, the NRC has issued numerical design objectives for each
    reactor unit for exposure from radioactive material releases into water and air. These design objectives
    are published in 10 CFR Part 50 and are considerably lower than the limits published in 10 CFR Part
    20.
    http://mitnse.files.wordpress.com/2011/03/waste_10.pdf


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