同位素是指原子序数相同，而质量数不同的各种原子。在元素周期表中占同一位置，其化学性质几乎相同。如C12、C13、C14。其中C14(碳十四)是具有放射性的同位素。
超精细光谱；非线性光学；简并四波混频技术；等效光栅；同位素检测。
Hyperfine spectrum; Nonlinear optics; Degenerate four waves mixing; The equivalent grating; Isotope detecting.
再加上检测同位素氧，分析表明至少有一具吃过小米的无头尸的主人，来自东欧，或者来自高海拔地区。
Combined with oxygen isotope testing, the analysis suggested that at least one headless millet-eater came from Eastern Europe or somewhere with access to water from high altitudes.
并且，他们或许要对2号反应堆周边其他放射性同位素的含量，包括对铯、钡、钴、镧的浑浊度，进行重新检测。
And they still may need to retest for other radioactive isotopes that had been found in the seawater around the No. 2 reactor, including troubling quantities of cesium, barium, cobalt and lanthanum.
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