A synthetic element produced in trace quantities by helium isotope bombardment of curium.

锎一种合成元素，由氦同位素轰击锔可得到微量的这种元素。

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It also bodes ill for the prospect of fusion using helium-3, a rare helium isotope that is missing a neutron.

这也预示着，利用氦- 3这种缺少一个中子的稀有的氦同位素进行核聚变的前景很黯淡。

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Helium isotope compositions of the mantle-derived xenoliths and megacrysts from the Cenozoic basalts in Hannuoba were measured.

对该地区新生代玄武岩中幔源包体和高压巨晶的氦同位素进行了初步研究。

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He and fellow Cornell researchers David Lee and Douglas Osheroff were awarded the Nobel for 1996 for their 1971 work on low-temperature physics involving the isotope helium-3, which has contributed to research ranging from the properties of microscopic matter to astrophysics.

WSJ: Cornell physicist and Nobel winner Richardson dies

"We are planning to build a permanent base on the moon by 2015 and by 2020 we can begin the industrial-scale delivery... of the rare isotope helium-3, " said Nikolai Sevastianov, head of Russian space vehicle manufacturer Energia, at a seminar in Moscow in January.

CNN: Mining the moon for a nuclear future

The substance that has such large potential is an isotope called helium-3, a form of helium but with only one neutron instead of two.

CNN: Mining the moon for a nuclear future