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How close can I get to a nuclear explosion with extreme shielding?

First, some numbers. Assuming a reasonably clean fusion design at one meter we are looking at 2.67E15 rad of x-rays and 1.08E14 rad of neutrons. The latter is harder to stop so I'll look at it. 7cm ...
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How close can I get to a nuclear explosion with extreme shielding?

According to this website, tungsten has a latent heat of vaporization of 824 kJ/mol. One mole of tungsten is about 0.184 kg, so we get about 4,480 kJ/kg. There are $6.276\cdot10^{16}$ joules per 15 mt ...
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