To explain this point I prepared synthetic chalcolite from pure products,and obtained crystals,whose activity was completely consistent with their uranium content; this activity is about half that of uranium.

• 为了解释这一现象，我准备了从纯产品中合成的铜铀云母，并得到了这种结晶体，其活性与其铀含量完全一致，活性大约是铀的活性的一半。