Radioactive iodine found in Gunma at 3 sewage plants — “Possibility of recriticality again”

Published: December 12th, 2011 at 4:24 am ET


Breaking news ; Possibility of recriticality again, Fukushima Diary, Dec. 11, 2011:

  • In Gunma
  • Samples were taken from Nov. 21 – Dec. 1
  • 4-10 Bq/kg of radioactive Iodine were measured at 3 sewage-treatment plants [Tamamura cho, Kiryu, and Hiratsuka]
  • 29-68 Bq/kg of Cesium were also measured at 5 sewage-treatment plants in Gunma

Google Translation: Gunma radioactive iodine from a sewage treatment plant sludge 3, Mainichi, December 11, 2011:

County on March 9, the radioactive cesium in 68-29 becquerels per kilogram of sludge from a sewage treatment plant five prefectural from a sewage treatment plant three of them announced that detects the radioactive iodine in 10-4 Bq same. […]

The highest water purification center奥利根cesium (Numata). Iodine is found in central province (Tamamura town), Kiryu, Hiratsuka (Isesaki) in three water purification centers, the county, “cause unknown” trying to.

Babelfish Translation: From sludge of 3 sewage disposal plants radioactive iodine/Gunma, Mainichi, Dec. 11, 2011:

It announced that the prefecture on the 9th, 1 kilo- hit from the sludge of 5 sewage disposal plants of prefectural management and the radioactive cesium of 68 – 29 Becquerel’s, detected the radioactive iodine of same 10 – 4 Becquerel’s from 3 sewage disposal plant among these.

As for picking day November 21st – December 1st. As for the highest value of cesium inner part Tone water treatment center (Numata city).

As for iodine being detected prefectural middle (Tamamura Cho), at 3 water treatment centers of Kiryu and Hiratsuka (Isesaki city), the prefecture has done “as for cause you do not understand”, that.


Published: December 12th, 2011 at 4:24 am ET


Related Posts

  1. Sharp rise in Iodine-131 levels at three Tokyo sewage plants (CHART) July 19, 2011
  2. Iodine-131 detected in Tokyo at multiple locations during November — 350 bq/kg at Kita garbage facility December 12, 2011
  3. “Fukushima in recriticality”? — Iodine-131 detected in 4 locations: Tokyo, Iwate, Nagano, Niigata (CHARTS) September 9, 2011
  4. Iodine-131 levels rise 350km from Fukushima at sewage plant — Radionuclides “starting to transform into other substances, such as tellurium has transformed into iodine” -Local Official (VIDEO) March 31, 2012
  5. Recriticality? Major Japan paper reports on detection of iodine-131 in Tokyo, Kawasaki October 18, 2011

22 comments to Radioactive iodine found in Gunma at 3 sewage plants — “Possibility of recriticality again”

  • Alice goaskAlice

    Oh poop!

    Is it okay to freak out now?

  • Captain Quark Captain Quark

    Ah Shit. Hitler might have said: DAS POOP!

  • BreadAndButter BreadAndButter

    4-10 Bq/kg iodine? To me, that sounds like “halflife leftovers”.
    The article does not say which iodine they found. Assuming they mean I-131, it shouldn’t be detectable anymore after 5-6 weeks, I think.
    The last recriticality we certainly know of was beginning of November, so that iodine might be from then.

  • goathead goathead

    Nice one jdstone!! Very refreshing and strange to see the truth of sorts printed in such a fashion!! My kind of paper…

  • dosdos dosdos

    Must be that pesky cancer patient urine again….. Drat that stuff. It gets everywhere, like radium bottles.

  • goathead goathead

    Only a matter of time before someone like colin powell stands up at the UN with a little jar of radium and some silly photos and accuses Iran of planting them around Japan!

  • jimbojamesiv

    Correct me if I’m wrong, but why would this indicate re-criticality and not simply continuing emissions of radioactive cesium or whatever death ray?

    I understand that cesium and/or iodine have short-half lives so they construe that to mean that it’s new or recent, but isn’t it also the case that if there’s a few million tons of it, that it would still be decaying, whether it was from nine months ago or yesterday.

    It’s likely that I’m confused, but why should anyone fall for the uh-oh, it’s gone recritical again?

    Any help?

    I noticed that B&B is sort of saying the same thing.

    • Exactly. “Re-criticality” is not needed to produce I 131, or any other radioactive emission. It’s more likely due to a change in wind direction. Yet another case of ‘mis-information.’

      Also, for those who like Mr Dee’s work, here is his website:
      Lots and lots of pics!

      • Heart of the Rose Heart of the Rose

        I assume that for many places…these tests will have to be considered base-line…through time and from here… we should be able to establish..the radiation level due to constant emissions and indicated by the spikes.

        • Heart of the Rose Heart of the Rose

          All that jazz with the overlay ..colors added.etc. was meant to instill doubt in the analysis process…It didn’t work.
          Actually..Black and white is just fine…pixel motion works….stuff like that…..

    • Bobby1

      I-131 comes from neutrons bombarding tellurium. You need a criticality to have neutrons.

      Most I-131 production is from nuclear reactor neutron-irradiation of a natural tellurium target. Irradiation of natural tellurium produces almost entirely I-131 as the only radionuclide with a half-life longer than hours, since most lighter isotopes of tellurium become heavier stable isotopes, or else stable iodine or xenon.

    • The answer is that without Tepco releasing all of their info about what they know and what they suspect, it is very challenging to know for sure EXACTLY what has happened and when. We DO KNOW that Tepco has consistently withheld crucial data from the Japanese public, the world scientific community, and their government. If these new findings of short-lived isotopes were simply the leftovers from earlier problems the we can be fairly certain that Tepco would have lots of data that showed that to be true. If Tepco COULD prove an absence of recriticality then they WOULD. Therefore until Tepco proves otherwise we can only safely assume that the data show worsening conditions (or at least no improvement). If it is old news then Tepco can prove that…. with no full disclosure forthcoming from Tepco/METI/NISA we are left to conclude that they are indeed hiding bad news from us… after all, would they wait to release good news? Don’t bet your children on it…. oops. Too late. Someone bet the kids lives already… and they did it with the help of everyone who su

    • Misitu

      131-I has a halflife of 8.02 days. Rule of thumb is that after 10 half lives there are insignificant amounts left: in the case of 131-I, after 80 days only about one thousandth of the original substance remains.

      “This is because I-131 is a major uranium, plutonium fission product, comprising nearly 3% of the total products of fission (by weight). See fission product yield for a comparison with other radioactive fission products.”

      Yield* Isotope Halflife Comment
      2.8336% 131I 8.02d Important in nuclear explosions and accidents but not in cooled spent nuclear fuel

      *yield (thermal neutron fission of U-235)
      6.7896% 133Cs → 134Cs
      6.3333% 135I → 135Xe
      6.2956% 93Zr
      6.1% 99Mo
      6.0899% 137Cs
      6.0507% 99Tc
      5.7518% 90Sr
      2.8336% 131I

      Iodine is the 7th most abundant decay product of 235U and of those is the one with the shortest halflife. It is therefore an extremely good marker for contamination as a result of nuclear fission.

      It is also solid at normal temperatures but can be seen sublimating into a purple-violet gas.

      If 131-I is detected over Europe and the velocity and other characeristics of the jetstream support the likelihood of its originating in Japan [sorry, I have to leave the maths to others here] then the implications for the amount being released at source and the duration of such release could be quite grave.

      Supporting this would be the quotation from IAEA that they were “quite concerned” about those recent 131-I measurements over Europe.

      Can I leave this for someone else to follow up, please?


  • ion jean ion jean

    Probably decay from that batch of I 131 that circled the globe, was picked up in eastern Europe, then fed itself back into the jet stream till it made its way through New England on Thanksgiving weekend.

    But I’m always wondering…where’s the strontium (sorry, my bones are starving!)?

    • Sickputer


      Also notice the “defective meter” at Unit 1 has measured a spike again three days ago after a week of slumber:

      Nuclear bureaucrats lining up to present minor tidbits of radiation data they share to the press. They do understand job security and their perceived role in society. They have to toe the company line which lately actually has shown how scared they are themselves. Radiation poisoning does not respect caste lines.

      That crack in the government armour in this 6000 year feudal culture shows things are dire indeed.

      • or-well

        Your characterisation “…feudal culture…” is VERY apt. Modern feudalism.

        Before 3/11 how many thought much about Japan, except “clean,polite,techno-savvy,with amusing variations on Western pop-culture,tea and Samurai movies”?

        Some knew about the financial bubble, 20 years of attempted recovery, growing debt, demographic decline etc.

        Since 3/11 my eyes have opened re: Japan.
        Inherited political fiefs,widespread decay and decline outside of urban concentrations, massive Gov/Ind/Media/Educ collusion to maintain the Elites’ power, an infantalised population, cultural traits that reinforce passive obediance, corruption and lying, extreme “porkbarrel” spending,revolving-door admin @ all level.

        They’re in a boatload of hurt and poorly structured to deal with it. The Japanese themselves need to rise up now.

        So do we.

  • ion jean ion jean

    Agreed J…there was/is a huge amount of it…like if a GE CT scan factory was hit by a DU shell from a stealth drone amount of it!

    Ah, the peaceful uses of nuclear power!