The Journal of General Physiology
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The Journal of General Physiology, Vol 6, 7-11, Copyright © 1923 by The Rockefeller University Press

ARTICLE

THE EFFECT OF RADIOACTIVE RADIATIONS AND X-RAYS ON ENZYMES

III. A UNIT OF MEASURE OF ACTIVITY FOR RADIUM EMANATION.



Raymond G. Hussey 1 and William R. Thompson 1

1 From the Laboratory of Biophysical Research of The Memorial Hospital and the Department of Pathology, Cornell University Medical College, New York.

In this communication we have introduced a unit to express activity or power of a given preparation of radium emanation. We have named this unit the curie-power and defined it as the activity of 1 curie of radium emanation and its radioactive products in equilibrium with it. We suggest the introduction of this unit in order that we may make a more comprehensive statement of our experimental observation.

In the radiochemical reaction effected by the radiations (beta and gamma) from radium emanation in which enzymes are inactivated the chemical change in a given system is a function of the product of two variables; namely, the average activity of the radium emanation, Pa, expressed in terms of the unit millicurie-power, and time, t, expressed in hours. This product has the dimensions of energy and is identical with W which is measured in terms of the energy unit, millicurie-power hours.

 Submitted on July 30, 1923


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