Abstract

It has become the custom to express the strength of radioactive sources in terms of curies. This is an erroneous use of this unit since by original definition the curie is that “amount of radon in equilibrium with one gram of radium”* as defined by the Radiology Congress in Brussels in 1910. Therefore, the curie can only be used to represent a rate of disintegration in the radium family. It then represents the disintegration rate of radium or its products in equilibrium. Such a use has been endorsed by the International Radium Commission.

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