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Penanggalan ionium–torium adalah sebuah teknik untuk menentukan usia sedimen laut berdasarkan jumlah yang ada dari torium-232 yang hampir stabil dan torium-230 yang lebih radioaktif. (²³⁰Th dulu dikenal sebagai ionium, sebelum diketahui sebagai elemen yang sama dengan ²³²Th.)^[1]

Referensi