“protactinium-ionium age method”的概念、定义、翻译、参考文献-科学参考

单词	protactinium-ionium age method
释义	protactinium-ionium age method [¦prōd´ak`tin·ē·ǝm ī`ō·nē·ǝm `āj ´meth·ǝd] ^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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