A photomultiplier tube, to detect the random photons thatemanate from the radium source.
一个光电倍增管，用来探测从镭放射源中随机发射的光子；
The diffusion coefficient of the molecule increases with temperature increasing, which makes radon released from radium source increase and causes radon concentration to increase;
温度增加，分子的扩散系数随着增加，使镭源释放的氡量增加，导致氡浓度变大；
Radium, that source of X-rays used to treat some cancers, had induced fatal malignancies in Marie Curie and her fellow researchers.
用作X射线源的镭被用来治疗某些癌症，但也曾导致玛丽•居里和她的同事患上致命的恶性肿瘤。
It is rare in nature because all its isotopes are short-lived and because radium, its source, is scarce.
在自然界很稀少，因为它所有的同位素都是短寿命的，还因为它的来源是稀有的。
The content of radioactive radium in mineral was 19 times higer than that in rock and served as a chief source of radon.
矿石样品放射性镭含量比岩石样品高19倍，为井下氡气的主要来源；
Radium can be fixed some distance from its original source.
镭在离它的原始母体一定距离上固定下来。
Radium can be fixed some distance from its original source.
镭在离它的原始母体一定距离上固定下来。
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