Thorium-232 is a naturally occurring, radioactive isotope of thorium, primarily used in nuclear reactors and as a potential source of nuclear fuel. It is significant because it undergoes a decay chain that can lead to the production of fissile uranium-233, and it plays a key role in decay chains and secular equilibrium, contributes to the U-Th-Pb geochronological system, and has implications for contaminant source identification in environmental studies.
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