A photomultiplier tube, to detect the random photons thatemanate from the radiumsource.
一个光电倍增管，用来探测从镭放射源中随机发射的光子；
2
The diffusion coefficient of the molecule increases with temperature increasing, which makes radon released from radiumsource 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；
3
Radium, that source of X-rays used to treat some cancers, had induced fatal malignancies in Marie Curie and her fellow researchers.