100 rads is 1 gray, and 5 grays leads to death in 14 days.
This book by the deputy chief engineer of the Chernobyl plant, provides a testimony to a contrary. E.g. on page 250, we hear of one radiation poisoning patient, who received roughly 10000 rads, and lived for 54 days.
On the other hand, it's the Soviet Men he's writing about.
Anyway, that picture is a pile of bullcrap. The Chernobyl accident irradiated Pripyat inhabitants and cleanup workers with roughly 100 mSv(
source) on average, with a few cases of over 250mSv(assuming alpha decay as the main irradiatin factor from fallout, and adjusting for the most vulnerable organs, it translates to no more than 4(100mSv)-10(250mSv) rads.
If you were to believe the numbers in that picture, the plant would have to vaporize itself in it's entirety, and then some.
I'm no meteorologist, I don't even know where to look for this data, but isn't that wind pattern characteristic of surface winds, with high-altitude ones going the other way around? At least that's what I remember from high school geography lessons.
The "Australian Radiation Services" is a private company specializing in handling radiation hazards, who's logo has been most likely hijacked by some fellow with trollish intentions.