目前情况下值得忧虑的是电离辐射，它由重同位素——如碘131和铯137——自发衰变而生成。
Of concern in the current situation is ionizing radiation, which is produced by spontaneously decaying heavy isotopes, such as iodine 131 and cesium 137.
它们晶体里重轻同位素的比例并不像是从地底挖出来的东西那样。
The ratio between the heavy and light isotopes of the element in their crystals is not quite right for stuff that has come out of the ground.
科学家认为重氮来自一颗彗星，而重氧则是来自行星形成的自然过程，这一过程把更轻的氧同位素留在了星云中，形成了太阳。
Scientists say the excess heavy nitrogen could have come from a comet. And the heavier oxygen from a natural process that left more of the light isotope in the part of the nebula that made the sun.
研究人员说锆石的高标准重氧同位素暗示了它形成之后靠地表水来冷却。
Researchers said the zircon's high level of heavy oxygen isotopes suggest it was cooled by surface water after it formed.
系统地计算了从轻到重的一系列元素极限温度的同位素分布，并从中抽取出热核的热稳定曲线。
We systematically calculated the isotope distributions of limiting temperatures for a series of nuclei from light to heavy nuclei, and obtain a thermal stability line for hot nuclei.
湘桂走廊地区大气降水明显的富集轻硫同位素（32S），而珠江三角洲地区则富集重硫同位素（34S）。
It is indicated that the sulfur isotopic composition of precipitation of Xiang-Gui Corridor is enriched in 32S, however, which of the Pearl River Delta is enriched in 34S.
假如如此，尘烬里就会包含诸多种类的比锂重的元素的同位素。
If so, the grains would contain a wide variety of isotopes from elements heavier than lithium.
在核保障环境取样分析中，对含铀单微粒进行元素和同位素分析是十分重要的。
In the safeguards environmental sampling, analyzing isotopic ratio of single uranium-bearing particle in swipe samples was very important.
该区的煤成气以甲烷碳同位素偏轻、重烃气体碳同位素偏重为特征；
The gases are characterized by rich light carbon isotope in methane and rich heavy carbon isotope in heavy hydrocarbons (C_2, -C_4).
该区的煤成气以甲烷碳同位素偏轻、重烃气体碳同位素偏重为特征；
The gases are characterized by rich light carbon isotope in methane and rich heavy carbon isotope in heavy hydrocarbons (C_2, -C_4).
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