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。
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