“Highest radiation level since the start of the nuclear crisis”: 10 sieverts per hour measured outside between Reactors No. 1 and 2

Published: August 1st, 2011 at 11:12 am ET


Highest radiation level monitored at stricken Japan nuclear plant, Deutsche Presse-Agentur, August 1, 2011:

The operator of a crippled Japanese atomic power plant said Monday it had measured the highest radiation level since the start of the nuclear crisis, a news report said.

Tokyo Electric Power Co (TEPCO) said more than 10 sieverts per hour of radiation was recorded on the surface of a pipe located outdoors between reactor 1 and reactor 2 at the Fukushima Daiichi Nuclear Power Station, Jiji Press reported. […]

h/t Anonymous tip

Published: August 1st, 2011 at 11:12 am ET


Related Posts

  1. Off the Chart: 225 Sieverts per hour at Reactor No. 1 — Highest radiation dose yet measured May 30, 2011
  2. NYT: Fatal Radiation Level Found at Fukushima — “Exceeded” 10 sieverts per hour, measuring device was maxed out August 2, 2011
  3. Radiation dose spikes to 48 sieverts per hour at Reactor No. 1 — Highest level in months — Remained stable until 10-fold increase — Instrument failure? February 20, 2012
  4. Highest radiation dose yet at Reactor No. 1 — 204 Sieverts per hour in drywell May 25, 2011
  5. 73 sieverts per hour detected at Reactor No. 2 — Measured 4 meters from bottom March 27, 2012

59 comments to “Highest radiation level since the start of the nuclear crisis”: 10 sieverts per hour measured outside between Reactors No. 1 and 2

  • BreadAndButter BreadAndButter

    Now…who will put up the circus tent over unit 1?
    And how many workers have been working in that area before they detected those levels?
    How near can you get to those levels without dropping dead immediately?

  • farawayfan farawayfan

    I’m surprised that reading made it out….

    Not surprised to see it not picked up in MSM….

    Hope they used a robot to get that measurement….

  • farawayfan farawayfan

    “Tepco sent three workers around the ventilation stack today after a gamma camera detected high radioactivity levels in the area yesterday, Matsumoto said. The workers were exposed to as much as 4 millisieverts during the work, he said.”

    Those are some wicked fast moving workers to only get 4 mSv total dose while evaluating a >=10 Sv radiation source…..

  • Agapit

    How will human workers be able to perform any work at all in that environment?

    1 – 3 Sv (1000 – 3000 mSv): Mild to severe nausea, loss of appetite, infection; more severe bone marrow, lymph node, spleen damage; recovery probable, not assured.
    3 – 6 Sv (3000 – 6000 mSv): Severe nausea, loss of appetite; hemorrhaging, infection, diarrhea, peeling of skin, sterility; death if untreated.
    6 – 10 Sv (6000 – 10000 mSv): Above symptoms plus central nervous system impairment; death expected.
    Above 10 Sv (10000 mSv): Incapacitation and death.

    Source: http://en.wikipedia.org/wiki/Sievert#Symptom_benchmarks

    • Agapit

      farawayfan: They were fast-moving indeed to get only .144 seconds of exposure, by my calculations (correct me if I’ve made a mistake)

      • Livingonearth

        The actual emission of radiations being 10 siv/h that is 10’000 msiv per 3600 seconds.

        The workers are said to have received 4 msiv.
        They stayed 3600 x 4 : 10000 = 1,44 second.
        They were fast moving …

        Is there a mistake anywhere ???
        Is there a lie anywhere ???

      • mv1526

        The 10 Sv readings is at the source or surface of the ventilation unit. The GammaCam which was used to gather that image images remotely and calculates the dose based on the range to the source. The Van that the GammaCam is mounted in is shielded. They workers drive the van to the point of view they wish to image and take a quick image ( in this case the image probably took 5 seconds) and drove away.

        No conspiracy to hide exposures or lying about what the workers were exposed to. Just simple usage of equipment that is actually designed to allow workers to get accurate dose readings without having to approach those sources.

        This equipment has been in use since the 90’s and is optimum for use at this facility with these conditions. I applaud TEPCO for actually releasing these images as compared the to other gamma camera they initially used, which showed nothing significant. I hope they continue to release images for the view of others to show the extent of damage and significance of the contamination.

        • BreadAndButter BreadAndButter

          would’ve been a good idea to take the reading from a shielded vehicle! Unfortunately, the “picture released by Tepco shows workers taking measurements with a detector attached to the tip of a 3-meter-long arm. The level of radiation where the workers stood reportedly reached 40 millisieverts per hour.” See the pic here:
          The poor guy doesn’t seem too shielded to me, may i say.

          • mv1526


            Except for the fact that the image you see is a file image. Not the way the reading was taken. That picture was taken years ago. The GammaCam image was taken in the same area using the JAEA truck that is cutom fitted with equipment racks and shielding.

            But what do I know, I’ve only seen it in action. You can continue to beleive what you want based on file photos that the press regularly uses and draw conclusions based on alarmism. Or you can use the facts.


            This link shows YOUR before picture with the GammaCam image AFTER.

        • Hemisfear311 Hemisfear311

          Don’t expect a standing ovation…

    • Fall out man!

      At the beginning off this crisis I used Wikipedia to get the effects of radiation, and how much radiation would kill a person. I posted the results on this site. No doubt looking at my earlier postings in a search would find it, I don’t think it was the Sievert page, but another one. That page on Wikipedia said there was a 50/50 chance of death from exposure to just 1 Sievert. 2 Sievert’s was a very high kill rate. So my rule of thumb then was 1 Sievert without treatment = death, and even if a person survives, their life will be short and horrible.

      Later people started quoting somewhat higher figures from Wikipedia for what it takes to kill a person. But now this 10 Sievert figure is huge. I wonder, is Wikipedia being revised upwards for what will kill a person. Just like government safety limits are being revised upwards.

  • Jon_NY Jon_NY

    Lets see…

    1 sievert = 100 rem
    10 sievert = 1000 rem

    Radiation causes ionizations in the molecules of living cells. These ionizations result in the removal of electrons from the atoms, forming ions or charged atoms. The ions formed then can go on to react with other atoms in the cell, causing damage. An example of this would be if a gamma ray passes through a cell, the water molecules near the DNA might be ionized and the ions might react with the DNA causing it to break.

    At low doses, such as what we receive every day from background radiation, the cells repair the damage rapidly. At higher doses (up to 100 rem), the cells might not be able to repair the damage, and the cells may either be changed permanently or die. Most cells that die are of little consequence, the body can just replace them. Cells changed permanently may go on to produce abnormal cells when they divide. In the right circumstance, these cells may become cancerous. This is the origin of our increased risk in cancer, as a result of radiation exposure.

    At even higher doses, the cells cannot be replaced fast enough and tissues fail to function. An example of this would be “radiation sickness.” This is a condition that results after high doses to the whole body (>100 rem), where the intestinal lining is damaged to the point that it cannot perform its functions of intake of water and nutrients, and protecting the body against infection. This leads to nausea, diarrhea and general weakness. With higher whole body doses (>300 rem), the body’s immune system is damaged and cannot fight off infection and disease. At whole body doses near 400 rem, if no medical attention is given, about 50% of the people are expected to die within 60 days of the exposure, due mostly from infections.

    If someone receives a whole body dose more than 1,000 rem, they will suffer vascular damage of vital blood providing systems for nervous tissue, such as the brain. It is likely at doses this high, 100% of the people will die, from a combination of all the reasons associated with lower doses and the vascular damage.


    • Mats


      You Americans do not like to be international dont you?

      Since 1985 the whole World is using Sievert.

      The continued use of the rem is “strongly discouraged” by the author style guide of the U.S. National Institute of Standards and Technology.

      • Arizonan Arizonan

        I think Americans would be happy to go to Sieverts-only but it is also in the interest of the nuke industry to keep things as confusing as possible!

        • Mats

          This may be, but is it not the job of scientists to teach the people?

          And not the job of businessmen?

          And if that is exactly the same in your fine country, than I think you have to free science from businessmen.

          (Don’t wonder, i’m a big fan of the US, so maybe i´m more critic than against another country that I dont like.)

          • stock stock@hawaii.rr.com

            Well, the teachers are all in the union. The scientists work for big corp or big gov.
            Big corp and big gov, report to big finance. big finance reports to their own greed.

            We have to free everyone from

        • stock stock@hawaii.rr.com

          well said

  • Whoopie Whoopie

    Posted to HP. TY Enenews.

  • CaptD CaptD

    This is known as “The Fuky Effect”…
    See this thread for more info on this:
    http://www.huffingtonpost.com/2011/07/30/japan-earthquake-64-magnitude-quake-reported_n_914099.html comment at 11:02AM today.
    and another earlier post yesterday…
    Good Luck Japan

    ps. You can also google huffingtonpost, The FuKy Effect

  • cossack55

    Saw the article posted on zerohedge.com which is probably the most read financial and world event site on the Internet (at least by those with an IQ over 50, which excludes most politicians),

  • Novamind

    My notes say that 2 Sieverts equals Death in Humans in six minutes.
    1 Sievert=1,000 Millisievert
    I wonder what the Sievert output for the whole Fukushima complex is?

    • stock stock@hawaii.rr.com

      It all depends on time and distance from the emitter, and size and shape of the emitter. Also those cute white suits they all wear don’t do a darn thing about most radiation, 40 pound lead jackets, like you wear when you do a dental xray are needed to mitigate the worst of the radiation.

  • radegan

    Now we know where that big ole chunk of plutonium went when the top of reactor three blew off.

    • Arizonan Arizonan

      That was my thought EXACTLY when I saw this 10 Sv headline….

      Someone should also start a “where is the reactor corium now?” betting syndicate…no one appears to know, and every time TEPCO announces they have “stabilized” the reactor core temps, I think, what and where are they measuring? Are they still relying on temp-measuring instruments inside the containment building?? I’m sorry, pardon me, but much of the corum has left the building, by TEPCO’s own faltering admission…

  • radegan

    Besides the new Japanese Internet Purgation Agency has suggested we substitute ‘smilies’ for ‘sieverts’ to help everyone keep a good attitude. So 10 Smilies = 1,000 milli-Smilies, etc.

    • Hemisfear311 Hemisfear311

      …and to increase protection from radiation, everybody should paint a big laughing smiley on their face masks.

    • lokay5 lokay5

      Or perhaps we should use the old NRC attempt at “happying up” radiation measurements and call Sieverts “Sunshine Units”.

      • Pallas89juno Pallas89juno@yahoo.com

        We need to be dragging the powers behind the talking heads in their underwear out into the streets and beating them by pogrom, until they begin to tell us the truth. Then they need step aside and do as we tell them to fix the problem. The people can do a better job at this than parasitic profiteers covering their asses.

  • nohobear nohobear

    If they are reporting ten sieverts, then you know it’s higher than that. That’s been the pattern all along. not a surprise to us, the regular readers of enenews. I consider it a small victory when I’ve turned someone on to this website. Sadly, the vast majority of fellow office workers are blithely unaware that the nuclear crisis in Japan is spiraling out of control. Even harder to get them to believe they are being doused with fallout courtesy of the jetstream. I’ve become the cranky office conspiracy nut.

    At some point, obvious radiation sickness will be seen in Tokyo, that can’t be covered up, and then the lid will blow on Japanese society.

    I hope I live to see Tepco CEOs, lying scientists, and government officials tried in the Hague for crimes against humanity and their complicity in the coverup. After conviction and sentencing, I’d be in favor of seeing them marched into the reactor buildings while the cameras roll and it was televised live.

    God help us all. The world is going to be a radically different place in 10 years.

  • ItsJustMetal ItsJustMetal

    A person wud die if they were there for more than 30 minutes. http://xkcd.com/radiation/

    • Pallas89juno Pallas89juno@yahoo.com

      They would instantly be made unconscious and would die within minutes to several hours if exposed for only seconds.

      • Pallas89juno Pallas89juno@yahoo.com

        machinery with any electrical components whatsoever would die or cease operating from radiation caused malfunction within minutes

        • mv1526

          Wrong! Standard non hardened, silicon based electronics would last for hours in that field. But nothing and no one is going into that field so its foolish to keep posting the effects on humans going into that field. Makes as much sense as posting how long a person would survive on the surface of Jupiter…..no one is going there either.

  • Pallas89juno Pallas89juno@yahoo.com

    Letter to a friend about this ridiculous out of control 10Sv./HOUR!!! level of radiation:

    Dearest MIchele:

    sorry about the fonts. I’m just sending you the below so you can see just how badly we’re in a news blackout and how the situation at Fukushima is only just beginning and is daily worsening, not improving as the media here and the lack of any general panic about this very real cataclysm would mislead us to believe is the case. Even though it’s something you’d rather not know that much about, I feel obligated to share this information–though infrequently to respect your wishes–with you just so you’re not out of the loop about what’s going on.

    Humans die, 100% guaranteed 99% of the time, from an external exposure of as little as 3 or 4 Sieverts an hour and the annual limit for radiation exposure absorbed (dosimetrics) is only POINT ONE .1 sieverts a year. Even at .1 Sieverts/yr. or 100mSv/yr this amount of radiation, about what U.S. nuke plant workers are supposed to tolerate by law–or really twice as much actually, an individual is likely to die of one or another form of cancer if they live long enough, caused by this extremely high rate of exposure. A full-body X-ray is far far lower and is measured in fractions of a microSievert (or millionths of a Sievert for comparison). At 10 Sieverts/hour (86,000 Sieverts a year!)–what is reported below for standing between reactor buildings one and two at Fukushima Dai ichi today is an (or 10Sv/hr.) exposure to radiation that equates to instant unconsciousness and nearly instantaneous death to, when outside the norm, death within minutes or a couple hours. It takes very dense (meters thick) LEAD shields to block this intensity of radiation. Otherwise, more than a hundred yards of earth might be required. There can’t really be any meaningful work going on anywhere near these buildings because such a high level of radiation would knock out any electronic or computer switches almost as quickly as it would kill a human–this was seen in far lower radiation environments at Chernobyl. This level of radiation also warps and weakens mechanical parts made of any substance. Some of the work being reported as going on at the common spent fuel pool (where there are 6,300 spent fuel assemblies in somewhat functioning cooled water pools) and at reactor building number 4 may actually be progressing somewhat as reported, or not. The spent fuel pool at reactor 4 has the highest radioactivity fuel as it was the most recently spent–reactor fuel is at its MOST radioactive when it is time to swap it out as “spent fuel”, or it was most recently taken out of reactor 4. Fortunately, on the other hand, this means that reactor #4 has no fuel to melt down from lack of cooling systems in the reactor containment itself. The only reason any work may be going on there is that there is a strong likelihood that this spent fuel did not yet fully melt down and through its own containment pool to the ground below the building. it’s still mostly in the pool. I’ve seen what I think are pics of it damaged with debris from the March 2011 reactor #3 explosion; but the assemblies appear to be mostly intact at spent fuel pool in reactor #4. The water surrounding the fuel assemblies acts as a moderator for the radioactive decay and may keep the radiation levels low enough to allow brief spates of work near the pool, very badly damaged and only half full of water (R#4 SPF)–barely covering the fuel, itself.

    The 10Sv./hr. level of radiation also warps metal parts and that’s not with heat radiation, the way that heat in the 2000 degree Farenheit or higher range is required to warp tempered industrial metals, plastics and ceramics.It’s just the radiation itself doing the warping and disintegrating of metals and concrete. Added heat radiation doesn’t help, either. Seawater and boron (highly corrosive) in either fresh or saltwater (itself corrosive) doesn’t help maintain structural integrity of anything either. This is another reason it’s terribly silly that nuke plant operators, particularly in the U.S. who are making bank off selling energy every bit funded and insured by taxpayer dollars in any country they exist (so we little people are being way more than double charged for this energy thanks to profiteering), the ultimate in privatization parasitism of the public purses, want to re-certify now 40-year old plants!!! Nuclear reactor buildings cannot last 20 years, if that long, without major structural impacts just from the radiation alone. The lack of civic responsibility is breathtaking for these nuclear power parasites.

    • Dr. Anne Lee Tomlinson Maziar anne

      87,600 Sieverts a year.

    • stock stock@hawaii.rr.com

      Well said, you are right on the money.

    • mv1526

      You are a fountain of misinformation. Im not sure where you are getting your data from but I suggest you delete that link. If 10 Sv warps metal then all Space Shuttles, the ISS every reactor containment vessel, fuel processing tank, waste storage tank……etc would be twisted mangled hulks of metal.

      LD50 for radiation is about 7.5 Sv. This means that exposure to that field would cause death to 50% of the people exposed. So 3-4 does NOT garentee death.

      Please stop posting alarmist propaganda that has no fact base to it. You do not have a clue whats going on at the spent fuel pools so dont speculate like you have some inside knowledge. You dont! The spent fuel is fully covered with water and as long as the pumping system is kept in service, not a problem. The problem is getting all other systems in the reactors functioning. Thats where the work is being done. Thats why the readings are being taken. To find the best ways to access the facilities.

      • BreadAndButter BreadAndButter

        your today’s posts are the first ones I read from you so far, and I must admit, I don’t like your tone.
        It would be greatly appreciated if you’d tried to speak your mind in a less offensive way towards others. Thank you.

        • mv1526


          I have never found facts offensive. Sorry if you do.

          • BreadAndButter BreadAndButter

            To call someone else “a fountain of misinformation” is hardly a fact.
            And to say that there’s not a problem with the SFP, as they’re “fully covered in water”, is NOT a fact, from all that we know.
            And to think that there might be only the slightest possibility to “get the other systems in the reactors functioning”, is nothing but a dream. The reactors are toast.
            I suggest we leave it at that.

          • Heart of the Rose Heart of the Rose

            Morning B&B..I’ll raise you two seiverts…
            Folks need to read ’em and weep…

          • mv1526


            I’ll rephrase for your sensitive eyes.

            Stop spouting misinformation like a fountain.

            Hope thats easier on ya.

            BTW, I was there and the SFP is covered with water and as I stated, as long as the cooling water is maintained, not a problem.

      • Hemisfear311 Hemisfear311


        You attack other people for not supplying links to their data. You seem to commit the same sin yourself. Please provide some convincing links and inputs.

        Most of us are just normal people, trying to see through the cover-ups and misinformation provided by TEPCO, whom you seem to trust for whatever reason. ´

        We may not be experts but that gives you no right to try and censor our statements. Feel free to supply us with the information that you apparently have access to, and let us judge for ourselves.

        • mv1526

          Not sure what you are saying. I never attack anyone for not supplying links. I just corrected misinformation. I never said I trusted TEPCO. I know what been released so far is minimal and there are TONS of unanswered questions. I am just happy they are finally releasing these images since I know they have had them for awhile and only been releasing the benign ones from a poor imager that showed nothing.

          But TEPCO’s reluctance to provide information is independant of facts on radiation. Shielding is shielding, point sources diminish is strength the same whether TEPCO releases info or not. Its a mess over there but hand wringing solves nothing.

          As for lethal levels, google it. You will find links galore that will report it as anywhere from 3.2 to 8 Sv. Thats why no one is going into those levels and they are using distance to there advantage. All standard ops in any nuclear facility around the world. ALARA still applies even during disasters!

          • Misitu

            This text reads like an inside job, from the hasty style of composition, through an allusion to knowledge of TEPCO’s mindset and the scrappy faux science, to bad spelling, careless grammar, and just plain ole fashun JARGUN! [ALARA????]

            This could be a textbook example of a mercenary hack going at top speed to kill as many targets in as short a time as possible. Sort of “panic attack” if you can pardon the humour.

            One thing is shooting bullets, to kill. But you have to be more careful with words, they can be re-read, and analysed with telling effect, far far down the time line.

            They really could do better! Maybe we should run a school for schills (only joking).

            And not forgetting the 10Sv/hr is the end stop on the counter.

            Misitu, sunshine land.

          • Misitu

            Further comment, this looks like the mercenary hack has taken dictation straight to t’internet, paid in cash and out of the door in five minutes.

            10 emo-Sv/hr in Tepco HQ I suppose!

    • mv1526

      BTW 6 inches of lead reduces that field strength down to .0000188329 sv. So meters of lead is not needed.

      • Misitu

        Maybe mv1526 is the tag for one of the contractors working for the honourable japanese government in the search and respond project to remove dishonourable rumours from social networking media…

  • James2

    MV – if you have been there, and you are not providing people with accurate information – which you are not – then you sir are part of the problem – and you sir are contributing to the deaths of others. Harsh but true.

    If you’ve been there, you know firsthand that this is the largest environmental catastrophe that has ever happened on earth. You know that dangerous radiation is spewing from that place. You know that the

    If you’d like to stop contributing to the deaths of others it’s a good time to start; just answer a few simple questions;

    1. What is the status of the cores of Reactors 1, 2 and 3?
    2. What is the source of the plutonium scattered about the grounds?
    3. Did the containment or the reactor #3 itself breech in the explosion on March 14th?
    4. What caused the explosion and fire in Reactor building #4?
    5. Is the SPF for #4 still intact?
    6. What was the substances oozing out of the southwest corner of the Reactor #4 and the middle of the north end and below the SPF on the south end? Why were the substances never explained.
    6. What landed on the northwest corner of Reactor 3 and then burned through the structure into the basement?
    7. What was the substance that contaminated the helicopter crew and subsequently the water and air supply aboard the USS Reagan that caused the captain to abandon his mission and turn the battle group away from Fukushima?. What was the source of that substance.
    8. What is the accurate amount of radiation traveling across the ocean to north America – how much radiation is falling in the US and Canada and are our food supplys at risk?