Geochron Laboratories was the first laboratory to provide high quality isotopic analyses to geological and archaeological communities on a comercial basis. 地质年代实验室是首家商务运作的、可为地质学和考古学团体提供高质量的同位素分析的实验室。Geochron Laboratories was the first laboratory to provide high quality isotopic analyses to geological and archaeological communities on a comercial basis. 地质年代实验室是首家商务运作的、可为地质学和考古学团体提供高质量的同位素分析的实验室。
" A problem I've been advertising as an isotopic crisis."
“我一直在宣传的一个问题是同位素危机。”
TED-Ed(视频版)
So if someone moves from one place to another, bones synthesized after that move will also reflect the new isotopic signatures of the surrounding environment.
Its chemistry, pristine because of the Wilcocks' swift action, showed that the water in it nevertheless had the same isotopic composition as water on Earth.
由于威尔科克斯的迅速行动,它的化学成分是原始的,表明其中的水与地球上的水具有相同的同位素组成。
万物简史
Ask a pair of geochemists how something like this works, and they will start talking about isotopic abundances and ionization levels with an enthusiasm that is more endearing than fathomable.
Problem is, as scientists have taken more and more precise isotopic measurements of the Moon they've found that it's nearly identical in composition to the Earth—not some other object.
Now, he says, a new theory in the journal Nature Geoscience may at least point to a way out of that isotopic crisis of the moon's chemical isotopes so closely resembling Earth's.
This, by studying the isotopic composition of ancient silver coins, has tried to draw conclusions about where the metal in a coin was mined, and thus about patterns of trade.
So to determine how much of the stuff was truly interstellar—from beyond our solar system—the researchers used other isotopic clues to screen out quantities of iron-60 produced by nuclear reactions and cosmic rays.