protactinium-ionium age method

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protactinium-ionium age method [¦prōd‚ak′tin·ē·əm ī′ō·nē·əm ′āj ‚meth·əd]

(geology)

A method of calculating the ages of deep-sea sediments formed during the last 150,000 years from measurements of the ratio of protactinium-231 to ionium (thorium-230), based on the gradual change of this ratio over time because of the difference in half-lives.

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