The researchers used what's called an ion microscope to compare the amount of normal hydrogen in the moon rocks to the amount of the hydrogen isotope deuterium, which carries an extra neutron.

研究人员利用所谓的离子显微镜来比较月球岩石中正常的氢元素含量及同位素氘的含量，元素氘比氢多带一个中子。

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The researchers used what’s called an ion microscope to compare the amount of normal hydrogen in the moon rocks to the amount of the hydrogen isotope deuterium, which carries an extra neutron.

科学家用到了一种叫离子显微镜的仪器，来比较月球岩石上氢的含量与重氢含量（重氢比普通氢多带有一个中子）。

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A neutron gamma ray type of wireline log that is run to determine the amount of chlorine present in a formation.

用于确定地层中氯含量的一种中子-伽马电缆测井方法。

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Terrestrial helium, for example, consists of a small amount of helium-3 (the nucleus of which has two protons and one neutron), and mostly helium-4 (which has 2 protons and 2 neutrons).

BBC: ET gases caged on Earth