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... What evidence do we have regarding the distribution of these elements? Is their distribution even or patchy? How do wew know?
Just spotted my interesting spelling of ele(w)ments; marks for originality?
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we can assume that there is more of these heavy minerals like Uranium, Radium and Thorium closer to the center of the earth, inside the iron core.
The most popular model of radioactive heating is based on the bulk silicate Earth (BSE) model, which assumes that radioactive materials, such as uranium and thorium, are found in the Earth's lithosphere and mantle – but not in its iron core.