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cGy vs Gy

Department of Oncology, University of Missouri, Columbia, Mo. 65203 USA

This excerpt was created in the absence of an abstract.

The radiation oncology practice has a prolonged history of using the rad as a unit. With the introduction of the SI system, the Gy came into being. It is fortunate that the Gy has a metric relation to the rad, such that 1 rad = 0.01 Gy or 1 cGy. The literature is having a mixture of use of Gy as well as cGy. It makes sense to be consistent. To use the cGy rather than the Gy may be preferable for the following reasons.

Received for publication January 1, 1991.