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rad
subjectfact 
radhas definition Unit of radiation, equal to 100 ergs of ionizing energy absorbed per gram of absorber.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:32:51.0
is an instance of radioactivity unit2001-09-27 09:32:51.0
is an instance of radioactivity unit2001-09-27 09:32:51.0
radioactivity unitis a unit of radioactivity2001-09-27 09:32:51.0
unithas historical origin2001-09-27 09:32:42.0
represents2001-09-27 09:32:42.0