Category Archives: radiation release

60 mill Bq released to air, over 200 mill Bq leak to sea each hour

On December 16 it was reported  that Levels of radioactive materials released outside the plant have declined to 60 million becquerels per hour, one-13 millionth of the levels at the time when the accident occurred. Additional radiation levels at the plant … Continue reading

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Biggest ever nuclear spill to ocean – 27 petaBq of Cs-137 is 20 times TEPCO’s estimate says IRSN

TEPCO earlier estimated that Cs-137  in the sea totalled  about 1 petaBq, and the JAEA earlier estimated 4 petaBq, compared to this estimate of 27 petaBq (see Table 1 here).  The major difference is that TEPCO counted only water leaks,  … Continue reading

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Fukushima release more than Chernobyl, C-137 double govt estimates, says new study of global data

The new model shows that Fukushima released 3.5 × 10^16  Bq caesium-137, roughly twice the official government figure, and half the release from Chernobyl.    Xenon-133 release was around 1.7 × 10^19 Bq, greater than the estimated total radioactive release of 1.4 × 10^19  Bq from Chernobyl, although … Continue reading

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High radiation dose readings marked in spots in Tokyo, Chiba – 3.35 uSv/hr (17 mSv/yr)

High radiation dose readings marked in spots in Tokyo, Chiba TOKYO (Kyodo) — High radiation doses were reported Thursday in spots in Tokyo and neighboring Chiba Prefecture, both over 200 kilometers away from the crippled Fukushima Daiichi nuclear plant, with … Continue reading

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MEXT radiation map shows high contamination 160km southwest

The Min of Education and Science published results of its latest aerial survey, covering a wider area than earlier helicopter surveys. Note that some areas 160km to the southwest seem to have higher doserates (1 to 1.9  microSv/hr) than some … Continue reading

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Officials did not warn of extra radiation due to rain and wind on March 15 – though half radiation fell onto ocean

A new JAEA report says that people were exposed unnecessarily because government warnings did not take into account the heavy rain after reactor 3 blew up, or the fact that the wind was blowing onshore at that time, instead of … Continue reading

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15,000 Terabequerels in ocean contamination – not 4,700 as TEPCO estimated. difference is air deposition

TEPCO has admitted two major water leaks from the plant, this study calculates some of the air-deposition.   Other water-leaks from the plant are still not included (as are strontium and other isotopes which may be of the same magnitude). … Continue reading

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Radiation measurements at 2500 locations in evac zones released by METI

METI sampled 2696 places in July and August.  One place was radiating at 700 milisieverts per year.   The Radiation readings in evacuation zones released The government has released the results of detailed radiation measurements in evacuation zones around the … Continue reading

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No cesium detected in seawater near No.3 reactor for first time

[UPDATE Sep 14: note that the detection level is about 35 Bq/L, and over the following week Cesioum levels rose about 100-fold  to 3000 Bq/L at this location, although TEPCO does not seem to have briefed the press on this.  … Continue reading

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Cesium release equal to 168 Hiroshima A-bombs

NISA has compared the various isotopes released, note this is only cesium.  Comparision of the overall releases from other sources are different… see estimate of 3o times Hiroshima’s  here. Sunday, Aug. 28, 2011 Cesium release equal to 168 Hiroshima A-bombs … Continue reading

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