行星科学家们可以通过计算一个特定元素有多少“母亲”放射性同位素衰变为“女儿”同位素来确定岩石的年龄。
Planetary scientists can determine a rock's age by calculating how many radioactive "parent" isotopes of a particular element have decayed into "daughter" isotopes.
利用增量方法和同位素交换技术，对角闪石族矿物的氧同位素分馏进行了理论计算和实验测定。
Oxygen isotope fractionation in amphiboles was determined by theoretical calculation using the increment method and by experimental measurement using isotope exchange technique.
介绍了红外、超声、高频、激光、同位素、微波、声发射、计算机等近代技术在木材工业上的应用概况。
This paper introduced the application of infrared ray, supersonic wave, high frequency, laser, radioisotope, microwave and acoustic emission technology to wood industry.
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