Ionium-thorium dating is a technique for determining the age of marine sediments based upon the quantities present of nearly stable thorium-232 and more radioactive thorium-230. (230Th was once known as ionium, before it was realised it was the same element as 232Th.)
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| - Penanggalan ionium–torium (in)
- Ionium–thorium dating (en)
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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.) (in)
- Ionium-thorium dating is a technique for determining the age of marine sediments based upon the quantities present of nearly stable thorium-232 and more radioactive thorium-230. (230Th was once known as ionium, before it was realised it was the same element as 232Th.) (en)
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| - Ionium-thorium dating is a technique for determining the age of marine sediments based upon the quantities present of nearly stable thorium-232 and more radioactive thorium-230. (230Th was once known as ionium, before it was realised it was the same element as 232Th.) The radioactive element uranium-238 is soluble in water. However, when it decays into thorium, the latter element is insoluble and so precipitates out to become part of the sediment. Thorium-232 has a halflife of 14.5 billion years, but thorium-230 has a halflife of only 75,200 years, so the ratio is useful for dating sediments up to 400,000 years old. Conversely, this technique can be used to determine the rate of ocean sedimentation over time. The ionium/thorium method of dating assumes that the proportion of thorium-230 to thorium-232 is a constant during the time period that the sediment layer was formed. Likewise, both thorium-230 and thorium-232 are assumed to precipitate out in a constant ratio; no chemical process favors one form over the other. It must also be assumed that the sediment does not contain any pre-existing particles of eroded rock, known as detritus, that already contain thorium isotopes. Finally, there must not be a process that causes the thorium to shift its position within the sediment. If these assumptions are correct, this dating technique can produce accurate results. (en)
- 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.) (in)
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