But an unexpected fact was noted: certain minerals( pitchblende, chalcolite, autunite) had a greater activity than might be expected on the basis of their uranium or thorium content.

但一个意外的事实引起了我的注意：某些矿质(青铀矿质、铀云母或钙铀云母)活性比铀或针含量所判断的要高。