Uhmmm....did you follow what Justa-HairyApe wrote? The Japanese say that the three fuel cores are no longer in the reactors. Is it likely that they...ahem...exited the reactors without dispersing the radiation? Tons of it?
Don’t you think a few people took a few measurements following Hiroshima? Ya know, radiation levels in Japan over time?
METI (Japanese govt. released survey results which indicated elevated radiation levels everywhere on the mainland (yes - I mean everywhere) As much as Japan/Tepco have been lying about all this- do you think they would have missed the opportunity to claim that the complete blanketing of the mainland with varying levels of radiation (the map they distributed was color coded to show the disappointing news that low level radiation contamination stretched from north to south - then was concentrated in fukushima with large hot spots north west) was there before the disaster? Uhmmm... no.
How about the hot spots? The exclusion zones? Chunks of fuel that prompted them to flag areas as impassible? Uhmmm...the photographs of the explosions blowing the domes off the power plants along with fuel assemblies? How about the oceanic surveys indicating high levels of radiation dispersed off the east coast (fukushima region?). The SPEEDI Data that METI withheld from the public showing the dispersal of radiation? No?
How about the power plant sensors that detected radiation at the start of the catastrophe? Before the tsunami hit, sensors detected radiation release - now that implies an elevation over background.
It’s spectacular how nuke pimps pretend all of the Ukraine contamination is a rumor, the medical studies are all hysterical old wives tales, and that Japan can blow tons of fuel out of three power plants (with water, air, and heat) and not elevate radiation in the environment. It’s just like magic! SELF SERVING TWO FACED LYING magic! You don’t have a ‘basis’ for your argument, you have PR magic.
Placemark for reading.