Radioactive decay of isotopes like uranium, thorium, and potassium is a primary long-term heat source driving mantle convection, volcanism, and plate tectonics, making this statement a widely accepted fundamental principle of geophysics.
The claim that radioactive decay plays a major role in driving Earth's geological activity is a well-established scientific fact regarding planetary heat budgets (along with primordial accretion heat and core crystallization). While some retrieved papers touch on radiogenic heat production (e.g., Paper [0]) and mantle thermal evolution (e.g., Papers [1], [9]), the baseline role of radiogenic heating in geodynamics is standard foundational knowledge in Earth sciences.