4 ms·

http://en.wikipedia.org/wiki/Sievert http://en.wikipedia.org/wiki/Sievert But I don't know how many Sieverts the map represents. Or if it's even depicting rate

• _delirium 16y ago
  The caption mentions "units/m^3", which would seem to indicate that the "units" would be some sort of particle count, and the colors on the map are particulate density? Just a guess, though. Radiation dosage wouldn't typically be given in units per volume, would it? If we assume (no idea if this is accurate) that the units are proportionally related to radiation dosage, though, and correlate them with other reports, the map bands might be roughly nano-sieverts per hour. Completely rough and unreliable calculation to arrive at that: This animation shows a plume over the Tokyo area in the 10^3 to 10^4 units range on March 15, and peak values over the plant in the 10^5 to 10^6 units range. Other reports have radiation in Tokyo peaking roughly on the order of 1 micro-Sv, and levels at the plant on the order of hundreds of micro-Sv. So if the units were nano-Sv per hour, the orders of magnitude are about right. Not sure what the total release given as "0.10E+19 Units" at the top would mean then. Anyway, why would someone make a technical-looking graph where everything is labeled in mysterious "units"?