Weird nuclear thought of the morning

US Air Force "Constant Phoenix" nuclear surveillance plane
credit: USAF

If you haven't heard the news, the North Korean government claims to have set off a hydrogen bomb. The US government will be attempting to determine the details of the bomb by flying one of their surveillance aircraft to collect those isotopes; it's a WC-135 outfitted with a collection suite for particles. (Is there an analytical suite on-board as well?) The science is run by the Air Force Technical Applications Center - they've hired at C&EN Jobs before.

Anyway, here's my weird thought: that the US government uses aerial surveillance to acquire chemical intelligence about nuclear weapons tests is well known. Does this means that there are North Korean scientists or engineers who attempt to hide/trap those isotopic emissions?

Those of you who understand the business of nuclear weapons, please correct me if I'm nuts.