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.
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.
母亲年龄、孕期健康状况是新生儿血铅水平的主要影响因素。
Both age and health conditions of pregnant women were the important factors affecting Lls level in newborn's blood.
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