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Does Earth even have enough radioactive materials to terraform Mars? We have chosen to focus on Uranium and Plutonium as our radioactive sources because they are currently used in nuclear weapons. Also, all isotopes of these two elements are radioactive, allowing a more continual heating of Mars.  One Uranium-235 atom can release 3.24 x 10$^{-11}$ Joules of energy by fission, and one Plutonium-239 atom can release 3.318 x 10$^{-11}$ Joules. There is currently an estimated 5.9025 x 10$^9$ kg of extractable uranium on Earth, which would not provide enough energy to terraform the atmosphere. Even if we used all of the uranium on Earth, it would still require an additional 84.25 x 10$^{10}$ kg of Plutonium-239 to vaporize enough polar ice. This is well beyond the radioactive inventory of Earth, so unfortunately, Earth does not have enough radioactive materials to terraform the surface of  Mars.