1. 
   gram rad
   a name sometimes used for the rad, a unit of radiation dose.
   Found op http://www.unc.edu/~rowlett/units/dictG.html
   
   
2. 
   gram-rad
   the earlier special unit of mean energy imparted 1 gram-rad = 10^-5 J = 10^-5 • Gy • kg
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=881-12-17
   
   

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