Na Hawajach ilość izotopu Uranu-238 wzrosła 50 razy po katastrofie jądrowej w Fukushimie.
 |
| Aby powiększyć, należy kliknąć |
Uranium-238 spiked to 50 times normal levels in Hawaii after Fukushima disaster — EPA changed unit of measurement after decades
Uranium-238 in
2011: 0.000215 picocuries per square meter (pCi/m3)
Uranium-238 in 2010: 4 attocuries per square 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.
Uranium-238 in 2010: 4 attocuries per square 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).