[Campion]

Again, we just don't know - a small, but effective neutron weapon of low explosive output would be consistent with the seismic data. I would assume this were the case.

A neutron bomb is a very small hydrogen bomb that's highly optimized to produce a big neutron flux. Given that we have no evidence that the NKs have ever developed a hydrogen bomb at all, I think an NK neutron bomb is highly unlikely, unless they stole it or bought it.

Remember that the US didn't develop neutron bombs until the 1970's. It's a 4th or 5th generation device, not a trivial piece of technology at all.

The much more likely explanation for a 500 ton yield is either (a) a barely-fueled "proof-of-concept" fission bomb, with a possible full yield test later; or (b) a lousy design.

[Fitzcarraldo]

I think an NK neutron bomb is highly unlikely, unless they stole it or bought it.

Bingo