File:Newton2011 7 27b.jpg

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Map of contamination after the Fukushima disaster.

Colors represent the density $D(\alpha,\delta)$ of ionizing radiation measured from the aircrafts (airplanes helicopters) and recalculated for April 29, altitude one meter above the ground.

The view covers the range approximately $140.0<\delta<141.1$, $36.8<\alpha<38.0~$.

The intermediate blue represents the Pacific Ocean, that does not show its contamination at the aerial view.

The dark blue indicates the region with $D<1\mu \mathrm {Sv/h}$. The following levels are shown:

$1\mu$Sv/h, between dark blue and light blue.
$1.9\mu$Sv/h, between light blue and green.
$3.8\mu$Sv/h, between green and yellow
$9.5\mu$Sv/h, between yellow and orange
$19\mu$Sv/h, between orange and red

Maximal estimate for the red region is 91$\mu$Sv/h.

The high resolution image appeared 2011 May 26 at the Newton Graphic Science Magazine, 2011, issue 7, page27. [1]

Similar image recalculated for levels of the concentration of rarioactivity in Becquerel/meter$^2$ is available at the MEXT cite [2] indicating that the recalculation uses the approximation that the surface density of contaminants $q= 1 $MegaBequerel/square meter causes corresponds to the density if ionizing radiation $D\approx 3.1$ microSievert per hour.

References

  1. http://www.newtonpress.co.jp/science/newton Map of contamination. Newton Graphic Science Magazine, 2011, issue 7, page27
  2. http://www.iaea.org/newscenter/news/tsunamiupdate01.html Fukushima Nuclear Accident Update Log. Staff Report, Updates of 12 - 18 May 2011; Last update: 23 May 2011.


Red corresponds to den

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