ABSTRACT
This chapter explains a letter 'Production of Radium from Actinium' to the journal in which Dr. Boltwood has given an account of experiments which show that radium is continuously produced in a solution of actinium. He also concludes that radium is a disintegration product of actinium, the latter occupying an intermediate position in the family of disintegration products between uranium and radium. The radium is produced from the actinium at about the theoretical rate, and he deduces in a simple way that the time for radium to be half transformed is about 3000 years. In the Bakerian lecture, the author briefly described some experiments that had been commenced to see whether actinium produced radium. The growth of radium observed in his actinium solution possibly might arise, not from the actinium itself, but from another distinct substance, normally separated from the radio-active mineral with the actinium.
