So, I mentioned at the beginning, while he was working with this radium bromide that I was very relieved to see that it did not kill him to do these experiments.

我在最开始就说了，由于他工作时接触到了溴化镭,我非常欣慰的,看到它做这些实验。

麻省理工公开课 - 化学原理课程节选

As carefully as people work with radioactivity here, and using often much, much safer radioactive materials than radium bromide, and using them, and special hoods, and having special procedures, they still do a lot of checking with these Geiger counters to make sure everything's safe.

虽然在这里人们,用放射性物质都非常的小心，而且通常用的材料放射性,都比溴化镭要小得多，并且用的时候,都用特殊的容器,特殊的操作过程,但我们平时仍会用。

麻省理工公开课 - 化学原理课程节选

But it's really interesting the studies that he did do with radium bromide, and he was studying the alpha particles.

但他用溴化镭,做的研究十分有意思，他研究的是alpha粒子。

麻省理工公开课 - 化学原理课程节选