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Meet the Nuclear Bomb That Killed People Without Exploding

What is Demon core ?

The demon core was a spherical 6.2-kilogram (14 lb) subcritical mass of plutonium 89 millimetres (3.5 in) in diameter, manufactured during World War II by the United States nuclear weapon development effort, the Manhattan Project, as a fissile core for an early atomic bomb. It was involved in two criticality accidents, on August 21, 1945, and May 21, 1946.

A re-creation of the experiment involved in the 1945 incident. The sphere of plutonium is surrounded by neutron-reflecting tungsten carbide blocks.

The core was intended for use in a possible third nuclear weapon to be dropped on Japan, but when Japan’s surrender made this unnecessary, it was repurposed for testing. It was designed with a small safety margin to ensure a successful explosion of the bomb. The device briefly went supercritical when it was accidentally placed in supercritical configurations during two separate experiments intended to guarantee the core was close to the critical point. The incidents happened at the Los Alamos Laboratory, resulting in the acute radiation poisoning and subsequent deaths of scientists Harry Daghlian and Louis Slotin, respectively. After these incidents the spherical plutonium core was referred to as the “demon core“.


At first glance there’s nothing so terrible about it.
A silver ball inside of a metal structure, that’s not scary, unless you know what the ball is it’s a so-called demon core the heart for atomic bombs in the alloy.
There’s a fissionable plutonium with tungsten carbide around it a reflector that excites the core and makes it unstable, it only takes one touch to be crippled.
It only takes one sudden move to be killed, if you leave it unattended something even worse will happen.
The scientists who had studied this core understood it was dangerous, but ignored the voice of reason.
what were they up to ? where did the name  demon come from ? and where is it now ? how did the demon try to get to its creatorand?and how did everyone around it get possessed ?
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