Estimate to what maximum temperature a piece of metal uranium-238 weighing m = 4 g can heat up in space due to natural radioactivity. The density of uranium is p = 18.7 g/cm3, the spontaneous fission period is T1/2sp = 1016 years. The characteristics of its alpha decay are T1/2a = 109 years, Ea = 4.2 MeV. Neglect the influence of solar radiation and cosmic rays.

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