I'm not denying they pick up radiation, I'm saying that it's possible that they could be simply picking up harmless radiation that naturally occurs or even some that simply pick up static and whatever.
Geiger counters are designed to pick up only harmful radiation. Alpha, beta, and gamma rays. They do detect static electricity.
The Japan atom bomb was never tested before it was supposedly unleashed on Japan.
What they say they tested before that, was not the same type of bomb, allegedly.
There were two different bombs dropped on Japan. One on Hiroshima, one on Nagasaki. The first one was a Uranium-235 Implosion type bomb, which was fully tested before use. The other was a design that had not gone through the testing completely, it was a Gun-type Plutonium bomb.
Below is how they say atomic bombs work.
Plutonium is created by exposing uranium to the neutron flux in an operating nuclear reactor and letting it "soak up some neutrons" and transform into plutonium. This is the most common approach to obtaining weapons materials that the nuclear powers use. So we have our nuclear material, and all we need to do now is make a bomb.
More neutrons does not make Uranium into Plutonium. You need more protons. This is done in a particle accelerator. Plutonium-239 is not the only fissionable material used in nuclear weapons. Uranium-235 is also used. Neptunium-237 and isotopes of americium can also be used.