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Before detonation a uranium-235 core is about ambient temperature and a plutonium-239 core is warmer than human body temperature. At detonation either type of core is at several million degrees, completely vapor, and radiating black body radiation peaking in the X-Rays. A moment later it has heated the air around it hot enough so that it is opaque to the entire electromagnetic spectrum. As this air cools it again becomes transparent to the black body radiation peaking in the X-Rays.

In the case of a hydrogen bomb, the temperature rises to several tens of millions of degrees.

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14y ago

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