There’s more history in Robert Becker’s book “the Body Electric”. He says that the US safe limit was arrived at by exposing hot dogs to radar transmitters and

There’s more history in Robert Becker’s book “the Body Electric”. He says that the US safe limit was arrived at by exposing hot dogs to radar transmitters and noting the lowest level at which they did not cook. The Soviets did their experiments on developing chicken embryos in eggs and arrived at a much lower limit. The Moscow embassy was subjected to a beam that was precisely set to the maximum safe US limit…continuously. Staff had to be rotated out every few months because they felt unwell. Somewhere else I read that after the war, the US got all the good German rocket scientists while the Soviets picked up the electromagnetic experts. Dunno if this is true but would be interesting to find out.