最为有名的就是铀- 238衰变为铅- 206的半衰期为45亿年，当然放射性铷和钐也同样对测算几十亿年前的物体的年龄很有用。
Most famously, uranium-238 decays into lead-206 with a half life of 4.5 billion years, though radioactive rubidium and samarium are also useful for dating things billions of years old.
应用离子探针shrimp测定锆石铀-铅年龄时，锆石选点至关重要，它将直接影响实验结果的可靠性和准确性。
When dating zircon U-Pb ages by SHRIMP, choosing the target points of zircon is very important as they directly affects the reliability and accuracy of the results.
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