Uranium-238 spiked to 50 times normal levels in Hawaii air after Fukushima disaster — EPA changed unit of measurement after decades

Published: October 28th, 2012 at 2:45 am ET
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Title: RadNet
Source: US EPA
h/t Fukushima Diary

  • Uranium-238 in 2011: 0.000215 picocuries per cubic meter (pCi/m3)
  • Uranium-238 in 2010: 4 attocuries per cubic meter (aCi/m3)

The conversion factor is 1 picorcurie = 1,000,000 attocuries

This equals 215 aCi/m3 in 2011 compared to 4 aCi/m3 in 2010, a 53-fold increase.

The EPA’s ‘risk range concentrations‘* begin at 510 aCi/m3.

*EPA has calculated target risk benchmark concentrations for most combinations of RadNet media (air, water, milk, and precipitation) and radionuclides or radiation types. These risk concentrations reflect EPA’s process for determining the level of contamination considered “safe or acceptable”, consistent with the National Oil and Hazardous Substances Pollution Contingency Plan (NCP) at 40 CFR 300.430(e)(2)(i)(A)(2).

Published: October 28th, 2012 at 2:45 am ET
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7 comments

7 comments to Uranium-238 spiked to 50 times normal levels in Hawaii air after Fukushima disaster — EPA changed unit of measurement after decades