Most nuclear bombs are optimized to get as much ‘boom’ instead of radioactivity as possible. The radiation and fallout that *does* occur from those warheads is really incidental. In fact pretty much every iteration of nuclear bomb has yielded less fallout and radiation than the ones before it.
Neutron bombs are the opposite. They sacrifice ‘boom’ in favor of more lingering radiation. Now, they’re still nuclear bombs, so they still make a massive boom. It’s only less explosive in comparison to other nuclear weapons. The idea was thrown around in the 50s 60s and 70s with the Cold War, especially as a way of countering and preventing Soviet invasions further into Europe. You can’t invade through radioactive wasteland, after all. Or, at least, it’s harder.
But the idea was really dumb in retrospect and they were phased out and decommissioned, especially with more precise weapons were made.
The weapon nowadays is completely defunct. Though, one might consider a dirty bomb the modern conceptual equivalent.
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