Polonium is a dull-green radioactive element. Polonium generates hight-temperature neutrons at a constant rate, in addition to inherent heat-increase over time. Exposure to neutrons increases its Tmp, becoming depleted polonium at 5. Depleted Polonium is grey in colour. Depleted Polonium doesn't give off neutrons, but continues to give off heat at a maximum of 115.01C. Polonium becomes Plutonium upon exposure to protons, which can take more time than expected, given Polonium is opaque to protons.