He had actually developed this detector with a postdoc by the name of Hans Geiger.

一起发明设计的,听到这个名字有人。

化学原理课程节选 : 麻省理工公开课

And what he used was a detector here, so he here could detect how many particles were hitting this detector.

粒子打中了探测器，这个探测器是他,和他的一个博士后叫Hans，Geiger的人。

化学原理课程节选 : 麻省理工公开课