Radiation spikes in Tokyo at Shinjuku detector — Up to triple normal levels

Published: March 27th, 2012 at 3:34 pm ET


Title: 東京都新宿区・足立区・品川区のリアルタイム計測放射線量ガイガーカウンター Shinjuku Adachi Shinagawa Tokyo Japan Geiger Counter 放射能 高精度測定 ゲルマニウム半導体検出器による超高精度測定・核種分析
Source: Security Tokyo
Date: March 28, 2012

Click for chart


Average: 0.05 microSv/h
Spike 1: 0.167 microSv/h at 02:00 JST (1:00p ET)
Spike 2: 0.122 microSv/h at 03:30 JST (2:30p ET)

The Adachi and Shinagawa monitoring posts seemed to stay within normal range.

View chart here (only available for another ~12 hours)

See also from this week: [intlink id=”radiation-dose-triples-at-tokyo-monitoring-post-early-sunday-doubles-at-another” type=”post”]{{empty}}[/intlink]

Published: March 27th, 2012 at 3:34 pm ET


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41 comments to Radiation spikes in Tokyo at Shinjuku detector — Up to triple normal levels

  • lam335 lam335

    I assume "normal levels" here refers to the "new normal" of post-03/11/11 Japan?

    • parwie

      "Normal" background radiation in Tokyo is about 0,2 mcSv/h. Not 0,1 mcSv/h. Background radiation several meters above the ground should not be considered, instead you should focus on hotspots that can be found everywhere, showing at least 0,8 mcSv/h. Those hotspots show real contamination levels= Radioactives particles can be inhaled or ingested everywhere. And does it really matter what it is exactly? Plutonium, Ceasium, Strontium, … ???

  • Tumrgrwer Tumrgrwer

    Normal? What normal? Just say that scares the hell out of me. WTF is normal anymore?

    • Normal is what "they" say it is.

    • 1776now

      I am in Tokyo right now, and have been for about two weeks. Heading back to US soon.

      "Normal" indoors: 0.05-0.09 mcSv/h.
      "Normal" outdoors (about 3ft from ground: 0.08-0.15mcSv/h.
      Ground readings vary.
      Normal ground surface such as pavement, concrete, etc. which is regulary walked on and exposed to rain: 0.3-0.5mcSv/h.
      Areas on ground where water and dust tend to collect: 0.5-1.5mcSv/hr…probably averaging around 0.7mcSv/h if I had to estimate.

      The recent earthquake was followed by northerly winds and this coincided with a jump in radiation. From what I have gathered over the net in the past several months, this seems to normal.

      Interestingly, on the 23rd, Yahoo showed winds blowing over Fukushima, out over ocean and then back right over Tokyo. This was accompanied by a gentle rain. In the restaurant where I eating, as more people came in from the street (rain), levels in the restaurant kept climing….from about 0.08mcSv/h initially to about 0.2mcSv/h as the restaurant filled up.

      There seems to be radioactive film of dust in the city. However, today was quite windy, and I expected the wind to stir up the accumulated dust in the hot spots all around, but readings at about 3ft did not show a big jump in radiation levels….at least not as much as I was expecting. I was in a different area of Tokyo, so it is was hard to say how much levels were actually increased.

      Today, I walked on an old school ground track field in the Shinbashi area of Tokyo, about 400 yards from Tepco's headquarters. The track is a kind of soft porous (rubber?) substrate which has lots of small crevaces to collect dust. Just walking across the former track area, my radiation meter jumped from about 0.08mcSv/h to about 0.4mcSv/h. I did not check the ground levels, but I would assume them to be well above any other readings I got in the past two weeks.

  • Grampybone Grampybone

    Normal used to be an average of .01-.03 mSv/h by US standards. Under "Normal" circumstances in Japan post 3/11 there is no standard anymore.

    • HoTaters HoTaters

      Wow, Grampybone, if that's true, we're in a world of hurt. Normal "background levels" in the San Francisco Bay Area, California area (where I live) are now .55 to .85. That's on a clear day when the jet stream isn't overhead. I was thinking that was probably good. Yikes!

      That means when there is a storm (measured indoors) the gamma and beta levels are now at least ten times higher than before. When it rains here I detect .137 to .197 mSv her hour, indoors, with a large HEPA filter going. Indoors.

      Out of curiousity, where did you get the stats for what used to be "normal" background levels?

      Ironic — there are few of us left live anymore who were around when background radiation levels were truly "normal" i.e., before the Manhattan Project.

      • HoTaters HoTaters

        "curiosity" Can't spell today. It's raining, so maybe it has addled my brain.

      • HoTaters HoTaters

        BTW, it rarely stays below .08 here for long anymore, even when we have fair weather. I think .067 to .079 (beta) is the new "normal" here on a nice day. So maybe not quite 10 times what it was before when it rains. But levels get really high now whenever it rains.

        Fresh from Fuku to you ….

        • HoTaters HoTaters

          Darn, I need to be careful here. That's 0.05 to 0.085 is "normal" during good weather. Sorry, .55 to .85 mSv is HUGE and it's nowhere near that high here. I have to be more careful. It makes a big difference where those zeroes go!

      • Multiply microSv by 8, that is a good approximation of your annual milliSv dose.

        1 or 2 is kind of OK.

        20mSv in only 1 particular year is probably OK

        All bets off if it becomes internal transmitter

  • sandman

    This appears to be around 1/3 to 1/2 of the daily dose in the US, and is well within their range for the past year, if you look at the graph linked. According to Wikipedia ("sievert"):

    "Average individual background radiation dose: 0.23 μSv/h (0.00023 mSv/h); 0.17 μSv/h for Australians, 0.34 μSv/h for Americans"

    If you look at the graph, these spikes to multiples of [whatever point in time they are being compared with] are so common as to appear almost a daily event.

    Am I misinterpreting the data? Misunderstanding the units? Or just suffering from an acute hysteria deficiency?


      sandman- .23 microseiverts per hour equates to 230 millisieverts per hour. just to clarify


        oops spelled it wrong there…Sievert Sievert Sievert Sievert Sievert Sievert Sievert Sievert Sievert Sievert

        OK. Think I got it

      • sandman

        Hi Itsnot. I believe there are 1000 microsieverts in a millisievert. So .23 microsieverts is the same as .00023 millisieverts. You just turned the units around.


      I thought about it for a few sandman you had the number correct sorry for adding to the confusion 🙂

      .23 uSv/h is .00023 mSv/h

      • sandman

        Sorry! I answered before I saw your answer.

        • .34 microsieverts an hour X 24 = 8.16 X 365= 2978.4 microsieverts

          Divided by 1000 = 2.9784 millisieverts a year from "background"

          Most European countries and Japan recommend in their environmental protection policies that BACKGROUND SHOULD NOT EXCEED 1 millisievert a year.

          Americans' background does is almost 3 times the recommended dose for background.

          These background numbers do not include INTERNAL EMITTERS

  • Atomfritz Atomfritz

    Don't worry.
    Just some harmless black street dust being distributed by the wind 🙂

    • Time Is Short Time Is Short

      That "harmless" black street dust is going to be the real surprise of this disaster. Unknown, unbelievably radioactive, spreading like a mold, what the hell is it?
      According to quantum physics, it is a lifeform of some sort, but nothing we have ever encountered.
      We're really screwed with this stuff.

  • jackassrig

    The neutron monitor is spiking again so we maybe in for another event.

  • please someone start some sort of Enting.
    Isengard has to be destroyed

  • Gaffney

    If there was another concentrated big release, it would probably be seen at several stations. But these small peaks do seem to come around after quakes, maybe mini releases?

  • Heart of the Rose Heart of the Rose

    The quakes excite the corium..and I suspect ..visa versa.. the corium reaches a state of criticality..and sputters…

  • Sam Sam

    WTF is that black substance showing up in Tokyo. I have read it could be combination of
    incineration ash combined with corium emissions—–anybody have a definitive take on it?.
    Looks nasty with the high Svh exposure to it. Not good.

    • moonshellblue moonshellblue

      Yes, a chemist I know, says that the black substance is probably from the corium melting through bedrock and that the earthquakes stirs or rather cracks open the crust and can been seen at times spewing from cracks in the ground around the reactor site but who knows it's just an educated guess.

  • Could we have more reactors pukeing then we have been told about ?

  • pure water

    This is what people inhale. Masks and special glasses should be provided. Now is the time for masks, not when the false flu flag came out!

  • apeman2501

    Thank you everybody for their input. The madness of not considering the thousands of years necessary to 'cool down' the spent fuel rendered any statements about profitability of investment in fission reactors as being false and stupid. These same stupid and greedy liars run the U.S. and the world will never have a chance at survival unless we take away their toys. This involves turning off your CFRtv and cutting the cord.

  • goathead goathead

    Ironically this nuclear meltdown is paralleling our own societal meltdown! It's as if the human race is incapable of staying the course for very long before it collapses under it's own useless weight. We need to return to a world where spades were called spades and elephants were asked to leave the room!! Yes it's time to unplug from this ugly matrix folks!!

  • BreadAndButter BreadAndButter

    Bamboo shoot contamination detected

    More radioactive contamination has been found in farm products for human consumption about 200 kilometers from the Fukushima Daiichi nuclear plant.

    Authorities in a northern city of Chiba prefecture on Tuesday sampled bamboo shoots grown for food. They found contamination of up to 250 becquerels of radioactive cesium per kilogram. 180 becquerels of cesium was found in the bamboo shoots harvested in another northern city in the prefecture. Both locations are some 200 kilometers from the crippled nuclear plant.

    The contamination levels are up to two-and-a-half times the government's new limit of 100 becquerels per kilogram, which goes into effect next month.

    Prefectural officials also say 130 becquerels of cesium per kilogram was detected last week in a bamboo shoot in a third city.

    The prefecture is asking farmers to refrain from shipping their bamboo shoots to customers.

    The officials suspect radioactive cesium carried from Fukushima landed upon the leaves of the parent bamboo and was absorbed by the roots.


    • mungo mungo

      and this..Fishing ban due to radioactive contamination

      Radioactive contamination from the Fukushima nuclear accident is forcing fishermen in a neighboring prefecture to suspend catches of one of their fish.

      Catches of Japanese sea bass are the first marine products of Miyagi Prefecture, north of Fukushima, to be suspended due to the nuclear accident.

      Up to 360 becquerels of radioactive cesium were detected in sea bass hauls over the past 2 months off the coast of Miyagi.

      Radioactive cesium levels in fish exceeded the stricter restrictions that will begin next month. This will be 100 becquerels per kilogram.

      Miyagi Prefecture and fisheries cooperatives are considering asking fishers in the prefecture to voluntarily refrain from catching the fish.

      2 other types of fish from the Miyagi coast have also exceeded the 100 becquerel level.

      Wednesday, March 28, 2012 07:39 +0900 (JST)

  • AGreenRoad AGreenRoad

    Only 50 Bq per kg caused irreversible lesions and heart problems in kids around Chernobyl.

    So tell me again, how 100 bq per kg in food and milk is 'safe'?

    Where do they think this radiation is going to go?

    Low dose radiation dangers, lessons from Chernobyl

    Radiation dangers in food and water

  • showe1966

    Congratulations to enews for your discussion board – very interesting.
    A very important point is that it is difficult for one to be rational about the risk levels associated with nuclear energy and the consequences of the Fukushima accident.
    My comment is that there are 2 basic approaches to take when observing physical phenomena.
    One is a theoretical approach and the other is experimental.
    I would therefore be very interested to make measurements whilst I am here is Tokyo. Can anyone recommend where I can buy a small portable geiger counter which will give me a readout in uSv (micro-sieverts) ? I guess the shops here must be selling them.
    BTW I was reading the UN paper on radiation levels. What is the UN recommended maximum dose ? Can anyone tell me ? It would seem to be 10 mSv annually is a normal level.
    Actually, I imagine and sincerely hope that the Japanese authorites have carefully monitored radiation levels and would take appropriate action if there was a significant level of risk, but no harm to do some experimental observations whilst I am here to find out what I observe "on the ground" so we can have more data to work on. Furthermore, it would seem to me that geology has the biggest impact on radiation levels.