It’s not, because the yield isn’t linear. There’s critical mass to start with. You cant get an event without reaching critical mass. Just a radioactive mess - dirty bombs.
Assuming you achieve critical mass, with a well designed device, yield goes up quadratically with mass, as long as your design remains efficient. At some point it’s not possible to efficiently compress the entire mass if it’s too large and the yield curve starts dropping off.
So, assuming it’s roughly as efficient as the Horoshima device and assuming it reaches critical mass, it’s more than two orders of magnitude weaker.
Using those assumptions.
Interesting and informative. Thank you.