Radioactive dust reported in Tokyo after recent fog — Over 4,000 Bq/kg of cesium — “Contamination never disappear, be careful”

Published: March 21st, 2013 at 3:16 pm ET


March 20, 2013 tweet from @niccori_can (citizen’s radiation monitoring station) translated by Fukushima Diary:

~10km from center of Tokyo

About the fog the other day, we managed to analyze the dust left on the street of Soka city […] 2,976 Bq/Kg of Cs-137 and 1,386 of Cs-134 […] Contamination never disappear. Be careful.

From 2011: [intlink id=”journalist-cesium-tokyo-indoor-dust-measured-1730-bqkg” type=”post”]{{empty}}[/intlink]

Published: March 21st, 2013 at 3:16 pm ET


Related Posts

  1. Journalist finds Tokyo indoor dust contaminated with cesium at 1,730 Bq/kg — Scientist: Dust with Fukushima fallout is the source of human radiation exposure (VIDEO) December 14, 2011
  2. Report: Over 200,000 Bq/kg of radioactive cesium in dust from outside Fukushima Prefecture January 6, 2013
  3. Gov’t Survey: Shinjuku, Tokyo has third highest cesium levels of all testing locations throughout Japan — “Large amounts of radioactive dust fell in Tokyo” November 27, 2011
  4. Magazine Headline: “Radioactive black dust striking Tokyo Metropolitan area” — I’ve been told it’s everywhere in city, says reporter May 15, 2012
  5. Weekly Asahi: 70% of children tested in Kanto (a region that includes Tokyo) have radioactive cesium in their urine -Journalist #Fukushima October 1, 2013

19 comments to Radioactive dust reported in Tokyo after recent fog — Over 4,000 Bq/kg of cesium — “Contamination never disappear, be careful”

  • Flapdoodle Flapdoodle

    I recently got satellite TV. I was amazed at the number of disaster/end of the World movies there are, yet none come close to what we are witnessing now.

  • weeman

    My question is was the fog radiated by ground shine or only the fog that past over reactors was radiated, how was fog radiated, sorry if I am asking a silly question any ideas. Not likely dust as when foggy it is damp and I would think this would cut down on wind blown contamination.

    • PavewayIII PavewayIII

      Sea fog around Japan forms when warmer air passes over cooler sea waters at the right temperatures. Usually in the early morning in summer – not sure about times for winter in Japan.

      Every fog droplet needs a condensation nucleus first – a sub-micron sized particle of dust, salt or carbon that floats by in the air. Water condenses on that particle and other water condenses on that until there's not enough warm moisture left in the air. Particles of sea fog are still tiny – maybe two to twenty microns – but far larger than the original particle.

      The nuclei of sea fog is usually sea salt. That gets in the air from breaking bubbles of sea water – there are tiny droplets that are sort of flung into the air when the bubble bursts. The bubbles are the white sea foam from waves. If the air is relatively dry, those aerosolized seawater particles evaporate leaving a speck of salt floating in the air.

      Sea salt is mostly an alkali metal – like sodium – stuck to a chloride ion. Half of the released cesium may end up dissolved in seawater as a chloride salt. The rest ends up as particulates in the water column.

      If a sea fog particle bumps into certain kinds of other dry sub-micron particles in the air, they will be absorbed. It's called scavenging. Cesium particles from incineration, dust or sea spray evaporation might get scavenged. Iodine gas eventually ends up as some kind of particulate.

      • weeman

        Thank you for enlightment.
        Does that not further proof of ongoing criticality if the iodine gas is contaminating the fog as it is short lived ?
        Sorry I am still in nuclear science 101.

        • PavewayIII PavewayIII

          It would, but I was only describing how some other radionuclides *could* get scavenged. As far as I know, they were just measuring Cs-134/137. They didn't mention iodine, and I wouldn't expect they would find any.

          TEPCO does put out a lot of documentation now, but most of the detailed stuff isn't translated. From what I can make out though, they're not finding iodine in the reactor cooling water or spent fuel pools. The two questions to keep in mind are 1) why would TEPCO ever tell the truth about anything, and 2) is there anything *in* the reactor for the cooling water to cool?

          Personally, I don't think the coriums are a threat. Certainly not as much as TEPCO's rusty high-voltage switch gear for Unit 1-4 that I doubt will ever work like it should. They'll spend money on 5 and 6 so they can restart those.

          TEPCO's focus right now is on restarting the Kashiwazaki-Kariwa 8TW plant. They will kill every last man, woman and child in Japan if they need to in order to restart those seven boilers.

  • PavewayIII PavewayIII

    4000 Bq? How is that even possible?

    The Japanese government's MEXT real-time monitoring stations in Tokyo can barely detect anything above background:

    You should be able to roll a ball of sticky rice down the street for an entire block and eat it without any immediate danger. It's as safe as Mayor Jim's watch.

    Look at the trends MEXT is reporting around Fukushima:

    Pretty soon, the MEXT radiation levels will be *negative* values. They'll be able to send radioactive waste TO Fukushima to have the radiation sucked out.

    Denko-chan: Fire up Units 5 & 6. These people need to make friends with electricity.

    • 16Penny 16Penny


      "Pretty soon, the MEXT radiation levels will be *negative* values. They'll be able to send radioactive waste TO Fukushima to have the radiation sucked out."

      Finally a solution to the world's nuclear waste storage problem. Now we just need to start the transoceanic pipeline to send the crap from Hanford over.

      And some said a solution to the nuclear waste storage problem might be found soon. Ha, I knew it was a for sure thing.

      Sarcasm aside, The way measurements are reported will not negate or reduce the damage that is being done. Sadly that statistic will be measured by the babies killed in in the womb and the number of body bags needed for the dead. I wish your remark was not sarcastic because it would mean we were all wrong and nuclear is not dangerous. Our reality sucks and none of the free world's politicians seem to have the balls to break ranks and tell us.

      Next on stage, China! Let's see how they share information with their people. I read that they would alert their public to the dangers posed by FUKU fallout. Let's see if it was sincere.

      • vital1 vital1

        "Next on stage, China! Let's see how they share information with their people. I read that they would alert their public to the dangers posed by FUKU fallout."

        This probably answers that question very clearly.

        This is an old Chinese news report, and video report from 2011. Lots of
        areas in China reported to be impacted by the Fukushima nuclear disaster
        fallout in 2011. These reports also propagated the propaganda that there is no threat to public health.

        8th April 2011 – Radioactive Iodine detections over 30 provincial areas, and
        Cesium over 22 provincial areas of China.

        This video has been newly posted but is an old report.


        Get the message out there on how serious the Fukushima nuclear disaster is
        quickly, and efficiently. You don’t need to explain anything just distribute the lifesaver.pdf or create your own, hand it out, mailbox it, or email it.

  • We Not They Finally

    Ever notice the stories about how after the disaster, customs would not let foreigners into Japan with Geiger counters? No good comes out of a system that bad.

    • kintaman kintaman

      Are there documented cases about people not being allowed to bring Geiger counters into Japan or is this just gossip? Any citation/links? Please let me know. Thanks.

  • ion jean ion jean

    Looks like twice as much Cs137 as 134…I know that reveals the age of the fission products…anyone remember how fresh that makes the stuff?

    • PavewayIII PavewayIII

      I think that's about the ratio for a year's worth of decay. They start out roughly the same – Cs-134 decays faster.

  • redwing redwing

    Be careful? Seriously?

  • PhilipUpNorth PhilipUpNorth

    Japan stops testing contaminated foods for radiation.
    "On March 19, the national government announced that certain leafy vegetables, fruits, and certain kinds of fish will be exempt from the tests conducted by the municipalities for radioactive cesium, starting April."
    The crimes continue.

  • Au Au

    A solar kill shot would probably be the best thing ever to solve all the problems. Yeah, a solar kill shot- that also turns all those bunkers into Suzy Home Bake Ovens.

  • Au Au

    Let me clarify. A global solar kill shot "to solve all the problems" in the world.

    • Au Au

      I feel sad to say that. I just don't see any way out of all of this pollution and corruption. I don't see Jesus, aliens, Allah, Buddha, etc jumping in to save the day. Maybe they have. Dunno.

  • nuknomore nuknomore

    I live in the northwest of the United States.. I went to the coast a few days ago.. Played by the ocean.. Drove through the redwoods..
    And wanted to cry.. Looking towards japan.. I wondered.. When will this all be a memory..? When will children have to suit up..Just to see it..?
    Or only get to see it in pictures and video?
    The tragedy is that we only have one earth.. One wonderful , beautiful place to live, and only one earth to sustain man and animal life on.
    And we might have just destroyed it for the future humans and animals..
    The ocean is dangerous and filthy.. The home of innocent animals..
    And where we get about 70% of our oxygen..
    It makes me feel sick inside..