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Anonymous U.S. Gov’t Nuclear Expert: Fukushima radiation levels were “astronomical… nothing containing release of radioactivity, it’s an unmitigated, unshielded number” — Monitor detected 100,000 Sv/hr

Published: February 18th, 2014 at 4:11 pm ET
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The Asia-Pacific Journal, Feb. 17, 2014: A U.S. government nuclear expert who was directly involved in the U.S. government’s radiation assessment of this situation said: “At 100 meters away it (the helicopter) was reading 4 sieverts per hour. That is an astronomical number and it told me, what that number means to me, a trained person, is there is no water on the reactor cores and they are just melting down, there is nothing containing the release of radioactivity. It is an unmitigated, unshielded number.” -Confidential communication, Sept. 17, 2012

Email from Defense Threat Reduction Agency on March 17, 2011 (pdf): “Please take note of the new ‘Containment monitor reading’ on slide 10.”

Slide 10

  • Continuous Release – Steam released for decay heat removal [...]
  • >> NFAC [Nuclear Forensics Analysis Center] Reactor Accident
  • >> >> Containment monitor reading: 10,000,000 R/hr [100,00 Sv/hr] (unconfirmed), tried to replicate the reported high radiation levels at site gate and computed and reported 375 R/hr [3.75 Sv/hr] from helicopter at 100 meters above spent fuel pools.

Using the inverse square law formula a dose rate of 3.75 Sw/hr at 100 meters, means from 0.5 meters away the dose rate equals 150,000 Sv/hr, very close to the 100,000 Sv/hr reported.

See also: NHK: 3.75 sieverts per hour was detected above Reactor 3 by helicopter

Published: February 18th, 2014 at 4:11 pm ET
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161 comments

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