Real-time map of Japanese Geiger counter readings(japan.failedrobot.com)

japan.failedrobot.com

Real-time map of Japanese Geiger counter readings

http://japan.failedrobot.com/

5 comments

I must be missing something, but [1] says "A whole-body exposure to 5 or more gray of high-energy radiation at one time usually leads to death within 14 days."

I see values of up to 460 Gy/h on this map, what time unit does [1] talk about that 5 is deadly but 460 is normal?

[1]: http://en.wikipedia.org/wiki/Gray_%28unit%29#Effect_on_the_b...

manveru15 anni fa

OK, I'm reasonably sure now that Wikipedia speaks about Gy/s.

That means that 5 Gy/s are 18000 Gy/h.

450 Gy/h equals 0.125 Gy/s.

andrewcooke15 anni fa

one problem is that because you use transparent overlays for the circles, and also colour coding (darker circles are higher values) you get a misleading appearance in heavily sampled areas (which appear darkly coloured just because they have many readings).

i'd suggest making the circles opaque (i know it's not going to look as nice, but it will be more useful...)

davepm15 anni fa

would be more useful if it were to shout measurements in sieverts/hr rather than Gray/hr, but I can understand that would be a hell of a lot more complex ;)

Interesting all the same.

frevd15 anni fa

"For X-rays and gamma rays, these are the same units as the sievert (Sv)."

http://en.wikipedia.org/wiki/Gray_(unit)

ADD: "Sievert = Biological effectiveness factor unique to the type of radiation * Gray"

http://www.hicare.jp/en/09/hi03.html

davepm15 anni fa

True, but Gray is for measurement of absorption by ANY material, Sievert is for measurement of absorption by biological material, so you would also need to apply the tissue weighting factor to the gray/hr measurement.

gersh15 anni fa

It shows the highest readings away from Fukushima. Why?

pyrhho15 anni fa