A method of radiometric dating based on the decay of uranium–235 (235U) to protactinium–231 (231Pa) that is used to date sediments as young as ten years old up to 250 000 years.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。