The sum of those nuclear blasts did not put as much radioactive material into the ocean and atmosphere as Fukushima.
Bombs are highly efficient in converting matter into energy - hence the astonishing heat/light/sound display of nuclear explosions.
Fukushima had a few small explosions, nothing on the order of the blasts you show. Less nuclear material was converted into energy - more nuke material flowing into the air, land and ocean.
And the real big problem is all that mass in the Spent Fuel pools and common spent fuel storage area. The worse case right now is the ground becomes unstable due to liquefaction and the buildings start collapsing from the numerous after shocks they are still having. Then the cooling stops and all that mass catches fire. The site already sunk about 5 to 6 feet from the big quake. And they have admitted the ground water problems. The Japanese themselves have more or less admitted all this recently after winning the last elections. They are slowly letting the truth out now.
Highly efficient meaning that only 60% of the U-235 or Plutonium gets converted to energy. The rest? Vaporized, and spread by wind and wave as highly radioactive fallout
Highly efficient meaning that most of the energy escapes as a flood of neutrons that converts the surrounding elements into radioactive isotopes. Which are then vaporized by the heat and spread far and wide by wind and ocean currents as intensely radioactive fallout.
Oh, and when you blast coral with neutrons, you preferentially generate precisely those isotopes that the body takes up easily, sodium, potassium, calcium, phosphorus, oxygen, carbon iodine and the bone seekers cesium and strontium.
Also, that 40% efficiency number? That’s for a well designed and fully optimized (within the limits of modern technology) modern bomb, the pit on the Hiroshima bomb weighed a couple pounds, of which less than the weight of one thin dime was converted to energy. The rest? Down wind as vapor and black rain.
We, that is the Unites state, Soviet Union, China, France and Britain, set off large numbers of above ground nuclear test weapons (and two in an actual shootin’ war) creating vastly more fallout than has escaped from Fukishima.
By your reckoning the downwinders in Nevada, Utah and throughout the Southwest should have all died slow or not so slow horrible deaths by now.
But by all means, don’t let facts interfere with your panic and fear-mongering...