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Could The Demon Core Still Go Supercritical If Mishandled?
2025-08-27 08:41:53
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3 Answers
Eleanor
2025-08-28 09:41:41
When I dug into those grim little episodes from Los Alamos history, the hair on my neck stood up — not because the physics was mystical, but because it was brutally simple. A plutonium sphere doesn't need to be part of a bomb to produce a dangerous burst of neutrons and gamma rays; it just needs the right combination of mass, shape, density, and nearby materials that reflect or slow neutrons. In practice that means a near-critical chunk like the so-called demon core could still be pushed into a prompt supercritical state if someone surrounded it with a good reflector (think beryllium or tungsten carbide), closed gaps that let neutrons escape, or accidentally soaked it in something that moderated neutrons like water.
I like to picture the old experiments: heavy hands moving reflective bricks, a gap closing millimeter by millimeter. That tactile closeness is what made the original incidents lethal. Modern nuclear materials are kept in geometries and containers designed to be subcritical under all credible disturbances — lots of boronated materials, fixed spacing, and administrative rules to prevent ad hoc tinkering. So yes, in theory, a demon-core-like object could go prompt supercritical if mishandled in the very specific ways that increase reactivity (adding reflectors, shaping into a compact sphere, compressing it). In reality, the combination of safeguards today makes accidental criticality from casual mishandling very unlikely, but the physics hasn’t changed, and that old, cold fact always gives me a chill when I read those accounts.
I like to picture the old experiments: heavy hands moving reflective bricks, a gap closing millimeter by millimeter. That tactile closeness is what made the original incidents lethal. Modern nuclear materials are kept in geometries and containers designed to be subcritical under all credible disturbances — lots of boronated materials, fixed spacing, and administrative rules to prevent ad hoc tinkering. So yes, in theory, a demon-core-like object could go prompt supercritical if mishandled in the very specific ways that increase reactivity (adding reflectors, shaping into a compact sphere, compressing it). In reality, the combination of safeguards today makes accidental criticality from casual mishandling very unlikely, but the physics hasn’t changed, and that old, cold fact always gives me a chill when I read those accounts.
Amelia
2025-08-31 07:16:49
I still get a jolt when I think about how fiddly criticality is. Let me strip it down: for a burst of runaway fissions you need enough fissile material in the right configuration, and you need to stop neutrons from walking away. The demon-core-era plutonium was already close to the threshold for criticality when surrounded by effective reflectors. So if you take a similar mass and deliberately or accidentally add a close-fitting reflector, or compress the mass to increase density, you can drop the critical mass and trigger a prompt supercritical excursion.
From a practical standpoint, a lot of things can act as reflectors or moderators depending on geometry — metals like beryllium or tungsten carbide, or even water and concrete in odd configurations. Historical accidents happened because experimenters put reflectors very close and misjudged the margin. Nowadays, facilities use passive controls: pieces are stored in shapes that can't become critical, containers have neutron absorbers like boron, and procedures forbid stacking or ad hoc assembly. So while the physics allows a supercritical event if those exact bad moves happen, modern engineering and rules make such a scenario highly avoidable. If you’re curious, read up on criticality safety principles — there’s a neat, almost forensic literature on how small changes in geometry change everything.
From a practical standpoint, a lot of things can act as reflectors or moderators depending on geometry — metals like beryllium or tungsten carbide, or even water and concrete in odd configurations. Historical accidents happened because experimenters put reflectors very close and misjudged the margin. Nowadays, facilities use passive controls: pieces are stored in shapes that can't become critical, containers have neutron absorbers like boron, and procedures forbid stacking or ad hoc assembly. So while the physics allows a supercritical event if those exact bad moves happen, modern engineering and rules make such a scenario highly avoidable. If you’re curious, read up on criticality safety principles — there’s a neat, almost forensic literature on how small changes in geometry change everything.
Wyatt
2025-09-02 09:39:55
In one line: yes, a demon-core-like mass of weapon-grade plutonium could still go supercritical if mishandled, but only under very specific circumstances. The essential ingredients are enough fissile mass, a compact shape (spheres are worst for leaking neutrons), increased density (compressing it lowers the critical mass), and neutron reflectors or moderators placed close enough to prevent neutrons escaping. Historically, the fatal incidents involved bringing reflectors in too close and reducing leakage, producing a prompt critical pulse that released a deadly burst of radiation.
What’s important to stress is that modern storage and transport practices are designed to eliminate those exact failure modes: items are kept in geometries that cannot be assembled into a critical configuration, containers often include neutron absorbers, and strict procedures and engineering controls prevent ad hoc experiments. So while the underlying nuclear physics hasn't changed, ordinary mishandling is less likely to cause a prompt supercritical event today — though deliberate or wildly negligent assembly could still be catastrophic, which is why these materials are handled with such paranoia and paperwork.
What’s important to stress is that modern storage and transport practices are designed to eliminate those exact failure modes: items are kept in geometries that cannot be assembled into a critical configuration, containers often include neutron absorbers, and strict procedures and engineering controls prevent ad hoc experiments. So while the underlying nuclear physics hasn't changed, ordinary mishandling is less likely to cause a prompt supercritical event today — though deliberate or wildly negligent assembly could still be catastrophic, which is why these materials are handled with such paranoia and paperwork.
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